Subject: Re: [Healeys] valve guides

From: Michael Salter <[email-masked]>
Date: Fri, 27 Mar 2015 15:01:45 -0400

--===============5383229888252372933==

--001a11c378187e294d051249c3b8

Hi Raymond,
The factory specification calls for 0.0025 to 0.0015 clearance for the
inlets and 0.002 to 0.001 clearance for the exhausts if you are using cast
iron guides however if you are using bronze THAT WILL NOT WORK!!!
To be safe with bronze guides you will have to hog them out to about 0.006"
clearance..which means there is really no point in replacing them.
I would point you to this article <http://www.netbug.net/blogmichael/?p=384>
on my blog...been there done that...

Michael S
BN1 #174

On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <[email-masked]>
wrote:

> I am rebuilding my 3000 cylinder head and have found the inlet valve stems
> have .008" clearance but the exhaust stems have only .002" clearance. Does
> anyone know if this is common?
>
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-- 
*If you can't fix it with a hammer, you've got an electrical problem.*

--001a11c378187e294d051249c3b8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Raymond, <br></div><div class=3D"gmail=
_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Th=
e factory specification calls for 0.0025 to 0.0015 clearance for the inlets=
 and 0.002 to 0.001 clearance for the exhausts if you are using cast iron g=
uides however if you are using bronze THAT WILL NOT WORK!!!<br></div><div c=
lass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-s=
ize:small">To be safe with bronze guides you will have to hog them out to a=
bout 0.006&quot; clearance..which means there is really no point in replaci=
ng them.<br></div><div class=3D"gmail_default" style=3D"font-family:comic s=
ans ms,sans-serif;font-size:small">I would point you to <a href=3D"http://w=
ww.netbug.net/blogmichael/?p=3D384">this article</a> on my blog...been ther=
e done that...<br><br></div><div class=3D"gmail_default" style=3D"font-fami=
ly:comic sans ms,sans-serif;font-size:small">Michael S<br></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">BN1 #174<br></div></div><div class=3D"gmail_extra"><br><div class=3D=
"gmail_quote">On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">rjsmit=
[email-masked]</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><=
div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;color:#0=
00000">I am rebuilding my 3000 cylinder head and have found the inlet valve=
 stems have .008&quot; clearance but the exhaust stems have only .002&quot;=
 clearance. Does anyone know if this is common?</div></div><br>____________=
___________________________________<br>
nk">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" target=3D"_blank">http://w=
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">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/[email-masked]" target=3D"_blank">http://autox.team.net/mailman/=
options/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=3D"=
color:black">If you can&#39;t fix it with a hammer, you&#39;ve got an elect=
rical problem.</span></font></i><br><br><div></div><div></div><div></div></=
div></div></div></div>
</div>

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_______________________________________________
Archive: http://www.team.net/archive

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---

From: Michael Salter <[email-masked]>
Date: Sat, 28 Mar 2015 15:12:16 -0400

--===============4832011498562060218==

--089e0160be64eef43105125e0698

Hi Gergo,
just so I'm clear...you are suggesting that the internal diameter of the
guide will get smaller as it heats up therefore that extra clearance is
required?
Michael S

On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <[email-masked]> wrote:

> Bronze guides expand more when they heat up. Thats why You have to use
> greater clearance. But when they work, the clearance will be the same. Worn
> out guides have two negative side effects: oil consumption, and premature
> wear on the valves as they dissipate heat slower due to rocking on the
> valve seat. The exhaust guides are more prone to oil consumption, exhaust
> guides are more prone to overheating.
>
> Gergo
>
> 2015-03-27 20:01 GMT+01:00 Michael Salter <[email-masked]>:
>
>> Hi Raymond,
>> To be safe with bronze guides you will have to hog them out to about
>> 0.006" clearance..which means there is really no point in replacing them.
>> I would point you to this article
>> <http://www.netbug.net/blogmichael/?p=384> on my blog...been there done
>> that...
>>
>> Michael S
>> BN1 #174
>>
>>> I am rebuilding my 3000 cylinder head and have found the inlet valve
>>> stems have .008" clearance but the exhaust stems have only .002" clearance.
>>> Does anyone know if this is common?
>>>
>> http://autox.team.net/mailman/options/healeys/[email-masked]
>>
>>
>>
>

--089e0160be64eef43105125e0698
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Hi Gergo, <br>just so I&#39;m clear...you=
 are suggesting that the internal diameter of the guide will get smaller as=
 it heats up therefore that extra clearance is required?<br></div><div clas=
s=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size=
:small">Michael S<br></div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">pajt=
[email-masked]</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv dir=3D"ltr">Bronze guides expand more when they heat up. Thats why You h=
ave to use greater clearance. But when they work, the clearance will be the=
 same. Worn out guides have two negative side effects: oil consumption, and=
 premature wear on the valves as they dissipate heat slower due to rocking =
on the valve seat. The exhaust guides are more prone to oil consumption, ex=
haust guides are more prone to overheating.<div><br></div><div>Gergo</div><=
/div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote"><div><div cl=
ass=3D"h5">2015-03-27 20:01 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt;=
<a href=3D"mailto:[email-masked]" target=3D"_blank">michaelsalter@=
gmail.com</a>&gt;</span>:<br></div></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v><div class=3D"h5"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"=
font-family:comic sans ms,sans-serif;font-size:small">Hi Raymond, <br></div=
><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif=
;font-size:small">The factory specification calls for 0.0025 to 0.0015 clea=
rance for the inlets and 0.002 to 0.001 clearance for the exhausts if you a=
re using cast iron guides however if you are using bronze THAT WILL NOT WOR=
K!!!<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans =
ms,sans-serif;font-size:small">To be safe with bronze guides you will have =
to hog them out to about 0.006&quot; clearance..which means there is really=
 no point in replacing them.<br></div><div class=3D"gmail_default" style=3D=
"font-family:comic sans ms,sans-serif;font-size:small">I would point you to=
 <a href=3D"http://www.netbug.net/blogmichael/?p=3D384" target=3D"_blank">t=
his article</a> on my blog...been there done that...<br><br></div><div clas=
s=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size=
:small">Michael S<br></div><div class=3D"gmail_default" style=3D"font-famil=
y:comic sans ms,sans-serif;font-size:small">BN1 #174<br></div></div><div cl=
ass=3D"gmail_extra"><br><div class=3D"gmail_quote"><span>On Fri, Mar 27, 20=
15 at 2:17 PM, RAYMOND SMITHSON <span dir=3D"ltr">&lt;<a href=3D"mailto:rjs=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span> wrote:=
<br></span><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bor=
der-left:1px #ccc solid;padding-left:1ex"><span><div><div style=3D"font-fam=
ily:arial,helvetica,sans-serif;font-size:10pt;color:#000000">I am rebuildin=
g my 3000 cylinder head and have found the inlet valve stems have .008&quot=
; clearance but the exhaust stems have only .002&quot; clearance. Does anyo=
ne know if this is common?</div></div><br></span>__________________________=
_____________________<br>
nk">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" target=3D"_blank">http://w=
ww.team.net/archive</a><br>
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.team.net/forums</a><br>
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">http://autox.team.net/mailman/listinfo/healeys</a><br>
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<br>
<br></blockquote></div><span><font color=3D"#888888"><br><br clear=3D"all">=
<br>-- <br><div><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=
=3D"color:black">If you can&#39;t fix it with a hammer, you&#39;ve got an e=
lectrical problem.</span></font></i><br><br><div></div><div></div><div></di=
v></div></div></div></div>
</font></span></div>
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nk">http://www.team.net/donate.html</a><br>
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eam.net</a><br>
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s/[email-masked]" target=3D"_blank">http://autox.team.net/mailman/opt=
ions/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><br></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail_sig=
nature"><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=3D"colo=
r:black">If you can&#39;t fix it with a hammer, you&#39;ve got an electrica=
l problem.</span></font></i><br><br><div></div><div></div><div></div></div>=
</div></div></div>
</div>

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[email-masked]

--===============4832011498562060218==--

---

From: Austin Healey <[email-masked]>
Date: Sat, 28 Mar 2015 21:38:08 +0100

--===============2479579919652471626==

--f46d04428d1c041c0805125f3a9a

Yes it does. The material has to expand somewhere. It cant go in the
oposite direction.

g

>>>> Does anyone know if this is common?

--f46d04428d1c041c0805125f3a9a
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Yes it does. The material has to expand somewhere. It cant=
 go in the oposite direction.<div><br></div><div>g</div></div><div class=3D=
"gmail_extra"><br><div class=3D"gmail_quote">2015-03-28 20:12 GMT+01:00 Mic=
hael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]=
" target=3D"_blank">[email-masked]</a>&gt;</span>:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"f=
ont-family:comic sans ms,sans-serif;font-size:small">Hi Gergo, <br>just so =
I&#39;m clear...you are suggesting that the internal diameter of the guide =
will get smaller as it heats up therefore that extra clearance is required?=
<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,s=
ans-serif;font-size:small">Michael S<br></div></div><div class=3D"HOEnZb"><=
div class=3D"h5"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a=
>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Bron=
ze guides expand more when they heat up. Thats why You have to use greater =
clearance. But when they work, the clearance will be the same. Worn out gui=
des have two negative side effects: oil consumption, and premature wear on =
the valves as they dissipate heat slower due to rocking on the valve seat. =
The exhaust guides are more prone to oil consumption, exhaust guides are mo=
re prone to overheating.<div><br></div><div>Gergo</div></div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote"><div><div>2015-03-27 20:01 GMT+=
01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:michaelsalter@=
gmail.com" target=3D"_blank">[email-masked]</a>&gt;</span>:<br></d=
iv></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;borde=
r-left:1px #ccc solid;padding-left:1ex"><div><div><div dir=3D"ltr"><div cla=
ss=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-siz=
e:small">Hi Raymond, <br></div><div class=3D"gmail_default" style=3D"font-f=
amily:comic sans ms,sans-serif;font-size:small">The factory specification c=
alls for 0.0025 to 0.0015 clearance for the inlets and 0.002 to 0.001 clear=
ance for the exhausts if you are using cast iron guides however if you are =
using bronze THAT WILL NOT WORK!!!<br></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small">To be safe wit=
h bronze guides you will have to hog them out to about 0.006&quot; clearanc=
e..which means there is really no point in replacing them.<br></div><div cl=
ass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-si=
ze:small">I would point you to <a href=3D"http://www.netbug.net/blogmichael=
/?p=3D384" target=3D"_blank">this article</a> on my blog...been there done =
that...<br><br></div><div class=3D"gmail_default" style=3D"font-family:comi=
c sans ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"gmai=
l_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small">B=
N1 #174<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote"><span>On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <span dir=3D"=
ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">rjsmithson=
@shaw.ca</a>&gt;</span> wrote:<br></span><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><sp=
an><div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt=
;color:#000000">I am rebuilding my 3000 cylinder head and have found the in=
let valve stems have .008&quot; clearance but the exhaust stems have only .=
002&quot; clearance. Does anyone know if this is common?</div></div><br></s=
pan>_______________________________________________<br>
nk">http://www.team.net/donate.html</a><br>
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.team.net/forums</a><br>
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eam.net</a><br>
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">http://autox.team.net/mailman/listinfo/healeys</a><br>
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s/[email-masked]" target=3D"_blank">http://autox.team.net/mailman/=
options/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><span><font color=3D"#888888"><br><br clear=3D"all">=
<br>-- <br><div><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=
=3D"color:black">If you can&#39;t fix it with a hammer, you&#39;ve got an e=
lectrical problem.</span></font></i><br><br><div></div><div></div><div></di=
v></div></div></div></div>
</font></span></div>
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ions/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><br></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><i><font><span style=3D"color:black">If you can&#39;t =
fix it with a hammer, you&#39;ve got an electrical problem.</span></font></=
i><br><br><div></div><div></div><div></div></div></div></div></div>
</div>
</div></div></blockquote></div><br></div>

--f46d04428d1c041c0805125f3a9a--

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[email-masked]

--===============2479579919652471626==--

---

From: Michael Salter <[email-masked]>
Date: Sat, 28 Mar 2015 22:09:12 -0400

--===============5703624057886523424==

--001a113433ea06aad0051263da3f

So Gergo,
if I understand you correctly in a situation where the guide was not
installed in a head and it was then heated the outside diameter and for
that matter the inside diameter of the guide would increase due to thermal
expansion....correct?
However, the difference, when the guide is installed in the head is that
the head material, i.e. the hole that the guide is installed in, would
prevent the guide from expanding or, expressed another way, because the
hole in the head would not increase in diameter as much as the guide would
increase in diameter the head material would effectively compress the guide
and prevent it from expanding..... correct?

Michael S

On Sat, Mar 28, 2015 at 4:38 PM, Austin Healey <[email-masked]> wrote:

>>>> <http://www.netbug.net/blogmichael/?p=384> on my blog...been there
>>>> done that...
>>>>
>>>> Michael S
>>>> BN1 #174
>>>>

--001a113433ea06aad0051263da3f
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">So Gergo, <br>if I understand you correct=
ly in a situation where the guide was not installed in a head and it was th=
en heated the outside diameter and for that matter the inside diameter of t=
he guide would increase due to thermal expansion....correct?<br></div><div =
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-=
size:small">However, the difference, when the guide is installed in the hea=
d is that the head material, i.e. the hole that the guide is installed in, =
would prevent the guide from expanding or, expressed another way, because t=
he hole in the head would not increase in diameter as much as the guide wou=
ld increase in diameter the head material would effectively compress the gu=
ide and prevent it from expanding..... correct?<br><br></div><div class=3D"=
gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:smal=
l">Michael S<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gm=
ail_quote">On Sat, Mar 28, 2015 at 4:38 PM, Austin Healey <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">pajtamuvek@g=
mail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr">Yes it does. The material has to expand somewhere. It cant go in t=
he oposite direction.<div><br></div><div>g</div></div><div class=3D"HOEnZb"=
><div class=3D"h5"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote=
">2015-03-28 20:12 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=
=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
om</a>&gt;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div =
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-=
size:small">Hi Gergo, <br>just so I&#39;m clear...you are suggesting that t=
he internal diameter of the guide will get smaller as it heats up therefore=
 that extra clearance is required?<br></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael S<br><=
/div></div><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
m</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">=
Bronze guides expand more when they heat up. Thats why You have to use grea=
ter clearance. But when they work, the clearance will be the same. Worn out=
 guides have two negative side effects: oil consumption, and premature wear=
 on the valves as they dissipate heat slower due to rocking on the valve se=
at. The exhaust guides are more prone to oil consumption, exhaust guides ar=
e more prone to overheating.<div><br></div><div>Gergo</div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote"><div><div>2015-03-27 20:01 =
GMT+01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:michaelsal=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span>:<br=
></div></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div><div><div dir=3D"ltr"><div=
 class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">Hi Raymond, <br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">The factory specificati=
on calls for 0.0025 to 0.0015 clearance for the inlets and 0.002 to 0.001 c=
learance for the exhausts if you are using cast iron guides however if you =
are using bronze THAT WILL NOT WORK!!!<br></div><div class=3D"gmail_default=
" style=3D"font-family:comic sans ms,sans-serif;font-size:small">To be safe=
 with bronze guides you will have to hog them out to about 0.006&quot; clea=
rance..which means there is really no point in replacing them.<br></div><di=
v class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fon=
t-size:small">I would point you to <a href=3D"http://www.netbug.net/blogmic=
hael/?p=3D384" target=3D"_blank">this article</a> on my blog...been there d=
one that...<br><br></div><div class=3D"gmail_default" style=3D"font-family:=
comic sans ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"=
gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:smal=
l">BN1 #174<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gma=
il_quote"><span>On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">rjsmit=
[email-masked]</a>&gt;</span> wrote:<br></span><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><span><div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:=
10pt;color:#000000">I am rebuilding my 3000 cylinder head and have found th=
e inlet valve stems have .008&quot; clearance but the exhaust stems have on=
ly .002&quot; clearance. Does anyone know if this is common?</div></div><br=
></span>_______________________________________________<br>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=
=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span =
style=3D"color:black">If you can&#39;t fix it with a hammer, you&#39;ve got=
 an electrical problem.</span></font></i><br><br><div></div><div></div><div=
></div></div></div></div></div>
</div>

--001a113433ea06aad0051263da3f--

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[email-masked]

--===============5703624057886523424==--

---

From: Austin Healey <[email-masked]>
Date: Sun, 29 Mar 2015 09:25:12 +0200

--===============1104239742128247600==

--047d7b5d8dab294ac7051268443d

Yes. This is happening. The head material expands less, the guide expand
more, and thus it has to go somewhere. Metals are not that "solid" as they
might look like.

Gergo

>>>>>> Does anyone know if this is common?

--047d7b5d8dab294ac7051268443d
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Yes. This is happening. The head material expands less, th=
e guide expand more, and thus it has to go somewhere. Metals are not that &=
quot;solid&quot; as they might look like.<div><br></div><div>Gergo</div></d=
iv><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">2015-03-29 4:0=
9 GMT+02:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:michaels=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</span>:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_defa=
ult" style=3D"font-family:comic sans ms,sans-serif;font-size:small">So Gerg=
o, <br>if I understand you correctly in a situation where the guide was not=
 installed in a head and it was then heated the outside diameter and for th=
at matter the inside diameter of the guide would increase due to thermal ex=
pansion....correct?<br></div><div class=3D"gmail_default" style=3D"font-fam=
ily:comic sans ms,sans-serif;font-size:small">However, the difference, when=
 the guide is installed in the head is that the head material, i.e. the hol=
e that the guide is installed in, would prevent the guide from expanding or=
, expressed another way, because the hole in the head would not increase in=
 diameter as much as the guide would increase in diameter the head material=
 would effectively compress the guide and prevent it from expanding..... co=
rrect?<br><br></div><div class=3D"gmail_default" style=3D"font-family:comic=
 sans ms,sans-serif;font-size:small">Michael S<br></div></div><div class=3D=
"HOEnZb"><div class=3D"h5"><div class=3D"gmail_extra"><br><div class=3D"gma=
il_quote">On Sat, Mar 28, 2015 at 4:38 PM, Austin Healey <span dir=3D"ltr">=
&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">pajtamuvek@gm=
ail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D=
"ltr">Yes it does. The material has to expand somewhere. It cant go in the =
oposite direction.<div><br></div><div>g</div></div><div><div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">2015-03-28 20:12 GMT+01:00 Mich=
ael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]"=
 target=3D"_blank">[email-masked]</a>&gt;</span>:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">Hi Gergo, <br>just so I=
&#39;m clear...you are suggesting that the internal diameter of the guide w=
ill get smaller as it heats up therefore that extra clearance is required?<=
br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sa=
ns-serif;font-size:small">Michael S<br></div></div><div><div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">On Sat, Mar 28, 2015 at 3:08 AM=
, Austin Healey <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]=
m" target=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex"><div dir=3D"ltr">Bronze guides expand more when they=
 heat up. Thats why You have to use greater clearance. But when they work, =
the clearance will be the same. Worn out guides have two negative side effe=
cts: oil consumption, and premature wear on the valves as they dissipate he=
at slower due to rocking on the valve seat. The exhaust guides are more pro=
ne to oil consumption, exhaust guides are more prone to overheating.<div><b=
r></div><div>Gergo</div></div><div class=3D"gmail_extra"><br><div class=3D"=
gmail_quote"><div><div>2015-03-27 20:01 GMT+01:00 Michael Salter <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">m=
[email-masked]</a>&gt;</span>:<br></div></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex"><div><div><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"=
font-family:comic sans ms,sans-serif;font-size:small">Hi Raymond, <br></div=
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div><div d=
ir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=3D"color:black">If yo=
u can&#39;t fix it with a hammer, you&#39;ve got an electrical problem.</sp=
an></font></i><br><br><div></div><div></div><div></div></div></div></div></=
div>

--047d7b5d8dab294ac7051268443d--

--===============1104239742128247600==
Content-Transfer-Encoding: 7bit
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[email-masked]

--===============1104239742128247600==--

---

From: Michael Salter <[email-masked]>
Date: Sun, 29 Mar 2015 10:49:06 -0400

--===============4156915768130187093==

--089e01227acea6f3e905126e7730

Ok Gergo,
We are making progress....
>From your answer I believe that you would concur that both the ID and the
OD of an unrestrained guide would increase as it is heated . i.e. thermal
expansion.
However, you conclude that solids are, to quote, "not that "solid" as they
may look".
>From that statement I presume that you are indicating that the solid
material of the guide distorts or deforms because it is constrained by the
hole in the cylinder head.
Now I would ask you to refer to this video from Purdue University College
of Technology:
https://www.youtube.com/watch?v=V6D3QgdO5Bk
If you are not into the mathematics just skip to 6:45 for the result.
371,000 lbs (168tonnes)!!!
Now check the structural strength of bronze... of course it varies a little
with different alloys but a yield strength of 650 Mpa ( 94274 p.s.i.) is
typical.
The mathematics required to use these numbers to calculate the forces
required to radially crush a cylinder (i.e. our valve guide)  are a little
complex but be assured the numbers are MASSIVE.
So, if the wall of our guide is presumed to have an area of only 600 sq mm.
(0.1 sq in), it would take 4276 kg (9427lbf)to distort or deform it.
Now, armed with that knowledge please read my blog post
<http://www.netbug.net/blogmichael/?p=384> carefully and you may have an
inkling for why I strongly advise against the use of bronze guides in a
cast iron head.

Michael S

On Sun, Mar 29, 2015 at 3:25 AM, Austin Healey <[email-masked]> wrote:

>>>> just so I'm clear...you are suggesting that the internal diameter of
>>>> the guide will get smaller as it heats up therefore that extra clearance is
>>>> required?
>>>> Michael S
>>>>
>>>>>> The factory specification calls for 0.0025 to 0.0015 clearance for
>>>>>> the inlets and 0.002 to 0.001 clearance for the exhausts if you are using
>>>>>> cast iron guides however if you are using bronze THAT WILL NOT WORK!!!
>>>>>> On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <[email-masked]
>>>>>> > wrote:
>>>>>>

--089e01227acea6f3e905126e7730
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Ok Gergo, <br></div><div class=3D"gmail_d=
efault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">We a=
re making progress....<br></div><div class=3D"gmail_default" style=3D"font-=
family:comic sans ms,sans-serif;font-size:small">From your answer I believe=
 that you would concur that both the ID and the OD of an unrestrained guide=
 would increase as it is heated . i.e. thermal expansion.<br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-siz=
e:small">However, you conclude that solids are, to quote, &quot;not that &q=
uot;solid&quot; as they may look&quot;. <br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">From tha=
t statement I presume that you are indicating that the solid material of th=
e guide distorts or deforms because it is constrained by the hole in the cy=
linder head.<br></div><div class=3D"gmail_default" style=3D"font-family:com=
ic sans ms,sans-serif;font-size:small">Now I would ask you to refer to this=
 video from=C2=A0Purdue University College of Technology: <br><a href=3D"ht=
tps://www.youtube.com/watch?v=3DV6D3QgdO5Bk">https://www.youtube.com/watch?=
v=3DV6D3QgdO5Bk</a><br></div><div class=3D"gmail_default" style=3D"font-fam=
ily:comic sans ms,sans-serif;font-size:small">If you are not into the mathe=
matics just skip to 6:45 for the result.<br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">371,000 =
lbs (168tonnes)!!!<br></div><div class=3D"gmail_default" style=3D"font-fami=
ly:comic sans ms,sans-serif;font-size:small">Now check the structural stren=
gth of bronze... of course it varies a little with different alloys but a y=
ield strength of 650 Mpa ( 94274 p.s.i.) is typical.<br></div><div class=3D=
"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:sma=
ll">The mathematics required to use these numbers to calculate the forces r=
equired to radially crush a cylinder (i.e. our valve guide)=C2=A0 are a lit=
tle complex but be assured the numbers are MASSIVE.<br>So, if the wall of o=
ur guide is presumed to have an area of only 600 sq mm. (0.1 sq in), it wou=
ld take 4276 kg (9427lbf)to distort or deform it. <br></div><div class=3D"g=
mail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small=
">Now, armed with that knowledge please read my <a href=3D"http://www.netbu=
g.net/blogmichael/?p=3D384">blog post</a> carefully and you may have an ink=
ling for why I strongly advise against the use of bronze guides in a cast i=
ron head.<br><br></div><div class=3D"gmail_default" style=3D"font-family:co=
mic sans ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"gm=
ail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"=
><br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,=
sans-serif;font-size:small"><br><br><br><br></div></div><div class=3D"gmail=
_extra"><br><div class=3D"gmail_quote">On Sun, Mar 29, 2015 at 3:25 AM, Aus=
tin Healey <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex"><div dir=3D"ltr">Yes. This is happening. The head materia=
l expands less, the guide expand more, and thus it has to go somewhere. Met=
als are not that &quot;solid&quot; as they might look like.<div><br></div><=
div>Gergo</div></div><div class=3D"HOEnZb"><div class=3D"h5"><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">2015-03-29 4:09 GMT+02:00 Micha=
el Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" =
target=3D"_blank">[email-masked]</a>&gt;</span>:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:comic sans ms,sans-serif;font-size:small">So Gergo, <br>if I under=
stand you correctly in a situation where the guide was not installed in a h=
ead and it was then heated the outside diameter and for that matter the ins=
ide diameter of the guide would increase due to thermal expansion....correc=
t?<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms=
,sans-serif;font-size:small">However, the difference, when the guide is ins=
talled in the head is that the head material, i.e. the hole that the guide =
is installed in, would prevent the guide from expanding or, expressed anoth=
er way, because the hole in the head would not increase in diameter as much=
 as the guide would increase in diameter the head material would effectivel=
y compress the guide and prevent it from expanding..... correct?<br><br></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-ser=
if;font-size:small">Michael S<br></div></div><div><div><div class=3D"gmail_=
extra"><br><div class=3D"gmail_quote">On Sat, Mar 28, 2015 at 4:38 PM, Aust=
in Healey <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" tar=
get=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div dir=3D"ltr">Yes it does. The material has to expand s=
omewhere. It cant go in the oposite direction.<div><br></div><div>g</div></=
div><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">201=
5-03-28 20:12 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:[email-masked]" target=3D"_blank">[email-masked]</a>&=
gt;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">Hi Gergo, <br>just so I&#39;m clear...you are suggesting that the in=
ternal diameter of the guide will get smaller as it heats up therefore that=
 extra clearance is required?<br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael S<br></di=
v></div><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote"=
>On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <span dir=3D"ltr">&lt;<a hr=
ef=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</=
a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Bro=
nze guides expand more when they heat up. Thats why You have to use greater=
 clearance. But when they work, the clearance will be the same. Worn out gu=
ides have two negative side effects: oil consumption, and premature wear on=
 the valves as they dissipate heat slower due to rocking on the valve seat.=
 The exhaust guides are more prone to oil consumption, exhaust guides are m=
ore prone to overheating.<div><br></div><div>Gergo</div></div><div class=3D=
"gmail_extra"><br><div class=3D"gmail_quote"><div><div>2015-03-27 20:01 GMT=
+01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:michaelsalter=
@gmail.com" target=3D"_blank">[email-masked]</a>&gt;</span>:<br></=
div></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex"><div><div><div dir=3D"ltr"><div cl=
ass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-si=
ze:small">Hi Raymond, <br></div><div class=3D"gmail_default" style=3D"font-=
family:comic sans ms,sans-serif;font-size:small">The factory specification =
calls for 0.0025 to 0.0015 clearance for the inlets and 0.002 to 0.001 clea=
rance for the exhausts if you are using cast iron guides however if you are=
 using bronze THAT WILL NOT WORK!!!<br></div><div class=3D"gmail_default" s=
tyle=3D"font-family:comic sans ms,sans-serif;font-size:small">To be safe wi=
th bronze guides you will have to hog them out to about 0.006&quot; clearan=
ce..which means there is really no point in replacing them.<br></div><div c=
lass=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-s=
ize:small">I would point you to <a href=3D"http://www.netbug.net/blogmichae=
l/?p=3D384" target=3D"_blank">this article</a> on my blog...been there done=
 that...<br><br></div><div class=3D"gmail_default" style=3D"font-family:com=
ic sans ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"gma=
il_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small">=
BN1 #174<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_=
quote"><span>On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <span dir=3D=
"ltr">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">rjsmithso=
[email-masked]</a>&gt;</span> wrote:<br></span><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><s=
pan><div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10p=
t;color:#000000">I am rebuilding my 3000 cylinder head and have found the i=
nlet valve stems have .008&quot; clearance but the exhaust stems have only =
.002&quot; clearance. Does anyone know if this is common?</div></div><br></=
span>_______________________________________________<br>
nk">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" target=3D"_blank">http://w=
ww.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums" target=3D"_blank">http://www=
.team.net/forums</a><br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
eam.net</a><br>
<a href=3D"http://autox.team.net/mailman/listinfo/healeys" target=3D"_blank=
">http://autox.team.net/mailman/listinfo/healeys</a><br>
<br>
s/[email-masked]" target=3D"_blank">http://autox.team.net/mailman/=
options/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><span><font color=3D"#888888"><br><br clear=3D"all">=
<br>-- <br><div><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=
=3D"color:black">If you can&#39;t fix it with a hammer, you&#39;ve got an e=
lectrical problem.</span></font></i><br><br><div></div><div></div><div></di=
v></div></div></div></div>
</font></span></div>
<br>_______________________________________________<br>
nk">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" target=3D"_blank">http://w=
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s/[email-masked]" target=3D"_blank">http://autox.team.net/mailman/opt=
ions/healeys/[email-masked]</a><br>
<br>
<br></blockquote></div><br></div>
</blockquote></div><br><br clear=3D"all"><br>-- <br><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><i><font><span style=3D"color:black">If you can&#39;t =
fix it with a hammer, you&#39;ve got an electrical problem.</span></font></=
i><br><br><div></div><div></div><div></div></div></div></div></div>
</div>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div><div d=
ir=3D"ltr"><div><div dir=3D"ltr"><i><font><span style=3D"color:black">If yo=
u can&#39;t fix it with a hammer, you&#39;ve got an electrical problem.</sp=
an></font></i><br><br><div></div><div></div><div></div></div></div></div></=
div>
</div>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=
=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font><span =
style=3D"color:black">If you can&#39;t fix it with a hammer, you&#39;ve got=
 an electrical problem.</span></font></i><br><br><div></div><div></div><div=
</div>

--089e01227acea6f3e905126e7730--

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[email-masked]

--===============4156915768130187093==--

---

From: Michael Salter <[email-masked]>
Date: Sun, 29 Mar 2015 16:06:04 -0400

--===============2015449731828728006==

--001a113433ea358648051272e59d

My long time friend Dick Paterson runs one of the fastest vintage mini
racers in North America.
Watch him, car #97, in this race at 13.00 mins :
https://www.youtube.com/watch?v=iNRAnvaWguc&list=PLItkgEMb_qyy_NEDpyTjd9c0PIe2vXeHV&index=3
In 2014, after running bronze guides for many years, he had a catastrophic
engine blow up and the cause was traced to the bronze exhaust guides
seizing to the valves.
You could not pay him enough money to change back to bronze guides
today..If it doesn't get you this season it will eventually!!

Michael S
BN1 #174

On Sun, Mar 29, 2015 at 3:20 PM, Austin Healey <[email-masked]> wrote:

> I am not deep into maths, but have some experience with bronze guides. We
> use them without problems in race mini engines. The key is to use less
> interference fit compared to iron guides. And of course set the system to
> bigger cold clearance.
>
> Gergo
>
> 2015-03-29 17:01 GMT+02:00 Michael Salter <[email-masked]>:
>
>> Oops, small miscalculation there... Where I wrote:
>> *So, if the wall of our guide is presumed to have an area of only 600 sq
>> mm. (0.1 sq in), it would take 4276 kg (9427lbf)to distort or deform it.*
>> I should have written:
>> *So, if the wall of our guide is presumed to have an area of only 600 sq
>> mm. (0.1 sq in), it would take 6042kg (13,329 lbf) [4276 kg (9427lbf) x
>> 1.414 (root 2)] to distort or deform it. *
>> I think;... because a compression failure would be considered to be a
>> shear failure at 45 degrees.
>> I'm sure there are people out there who are better at these calculations
>> than I am from whom I would welcome comment.
>>
>> Michael S
>> BN1 #174
>>
>> On Sun, Mar 29, 2015 at 10:49 AM, Michael Salter <[email-masked]
>> > wrote:
>>
>>> Ok Gergo,
>>> From your answer I believe that you would concur that both the ID and
>>> the OD of an unrestrained guide would increase as it is heated . i.e.
>>> thermal expansion.
>>> However, you conclude that solids are, to quote, "not that "solid" as
>>> they may look".
>>> Now I would ask you to refer to this video from Purdue University
>>> College of Technology:
>>> Now check the structural strength of bronze... of course it varies a
>>> little with different alloys but a yield strength of 650 Mpa ( 94274
>>> p.s.i.) is typical.
>>> So, if the wall of our guide is presumed to have an area of only 600 sq
>>> mm. (0.1 sq in), it would take 4276 kg (9427lbf)to distort or deform it.
>>> <http://www.netbug.net/blogmichael/?p=384> carefully and you may have
>>> an inkling for why I strongly advise against the use of bronze guides in a
>>> cast iron head.
>>>
>>> Michael S
>>>
>>>
>>>
>>>
>>>
>>>
>>>> Yes. This is happening. The head material expands less, the guide
>>>> expand more, and thus it has to go somewhere. Metals are not that "solid"
>>>> as they might look like.
>>>>
>>>> Gergo
>>>>
>>>>> However, the difference, when the guide is installed in the head is
>>>>> that the head material, i.e. the hole that the guide is installed in, would
>>>>>>> On Sat, Mar 28, 2015 at 3:08 AM, Austin Healey <[email-masked]
>>>>>>> > wrote:
>>>>>>>
>>>>>>>> Bronze guides expand more when they heat up. Thats why You have to
>>>>>>>> use greater clearance. But when they work, the clearance will be the same.
>>>>>>>> Worn out guides have two negative side effects: oil consumption, and
>>>>>>>> premature wear on the valves as they dissipate heat slower due to rocking
>>>>>>>> on the valve seat. The exhaust guides are more prone to oil consumption,
>>>>>>>> exhaust guides are more prone to overheating.
>>>>>>>>
>>>>>>>> Gergo
>>>>>>>>
>>>>>>>>> To be safe with bronze guides you will have to hog them out to
>>>>>>>>> about 0.006" clearance..which means there is really no point in replacing
>>>>>>>>> them.
>>>>>>>>> <http://www.netbug.net/blogmichael/?p=384> on my blog...been
>>>>>>>>> there done that...
>>>>>>>>>
>>>>>>>>> Michael S
>>>>>>>>> BN1 #174
>>>>>>>>>
>>>>>>>>> On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <
>>>>>>>>> [email-masked]> wrote:
>>>>>>>>>
>>>>>>>>>> I am rebuilding my 3000 cylinder head and have found the inlet
>>>>>>>>>> valve stems have .008" clearance but the exhaust stems have only .002"
>>>>>>>>>> clearance. Does anyone know if this is common?
>>>>>>>>>>

--001a113433ea358648051272e59d
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">My long time friend Dick Paterson runs on=
e of the fastest vintage mini racers in North America. <br></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">Watch him, car #97, in this race at 13.00 mins :<br><a href=3D"https=
://www.youtube.com/watch?v=3DiNRAnvaWguc&amp;list=3DPLItkgEMb_qyy_NEDpyTjd9=
c0PIe2vXeHV&amp;index=3D3">https://www.youtube.com/watch?v=3DiNRAnvaWguc&am=
p;list=3DPLItkgEMb_qyy_NEDpyTjd9c0PIe2vXeHV&amp;index=3D3</a><br></div><div=
 class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font=
-size:small">In 2014, after running bronze guides for many years, he had a =
catastrophic engine blow up and the cause was traced to the bronze exhaust =
guides seizing to the valves.=C2=A0 <br></div><div class=3D"gmail_default" =
style=3D"font-family:comic sans ms,sans-serif;font-size:small">You could no=
t pay him enough money to change back to bronze guides today..If it doesn&#=
39;t get you this season it will eventually!!<br><br></div><div class=3D"gm=
ail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"=
>Michael S<br></div><div class=3D"gmail_default" style=3D"font-family:comic=
 sans ms,sans-serif;font-size:small">BN1 #174<br></div></div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">On Sun, Mar 29, 2015 at 3:20 PM=
, Austin Healey <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]=
m" target=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex"><div dir=3D"ltr">I am not deep into maths, but have =
some experience with bronze guides. We use them without problems in race mi=
ni engines. The key is to use less interference fit compared to iron guides=
. And of course set the system to bigger cold clearance.<div><br></div><div=
>Gergo</div></div><div class=3D"HOEnZb"><div class=3D"h5"><div class=3D"gma=
il_extra"><br><div class=3D"gmail_quote">2015-03-29 17:01 GMT+02:00 Michael=
 Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a>&gt;</span>:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-=
family:comic sans ms,sans-serif;font-size:small"><span>Oops, small miscalcu=
lation there... Where I wrote: <br><i>So, if the wall of our guide is presu=
med to have an area of only 600 sq=20
mm. (0.1 sq in), it would take 4276 kg (9427lbf)to distort or deform it.</i=
><br></span>I should have written:<br><i>So, if the wall of our guide is pr=
esumed to have an area of only 600 sq=20
mm. (0.1 sq in), it would take 6042kg (13,329 lbf) [4276 kg (9427lbf) x 1.4=
14 (root 2)] to distort or deform it.
 </i><br></div><div class=3D"gmail_default" style=3D"font-family:comic sans=
 ms,sans-serif;font-size:small">I think;... because a compression failure w=
ould be considered to be a=C2=A0 shear failure at 45 degrees. <br></div><di=
v class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fon=
t-size:small">I&#39;m sure there are people out there who are better at the=
se calculations than I am from whom I would welcome comment.<br><br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small">Michael S<br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">BN1 #174<br></div></div=
><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun=
, Mar 29, 2015 at 10:49 AM, Michael Salter <span dir=3D"ltr">&lt;<a href=3D=
"mailto:[email-masked]" target=3D"_blank">[email-masked]<=
/a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><d=
iv class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;fo=
nt-size:small">Ok Gergo, <br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">We are making progress.=
...<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans m=
s,sans-serif;font-size:small">From your answer I believe that you would con=
cur that both the ID and the OD of an unrestrained guide would increase as =
it is heated . i.e. thermal expansion.<br></div><div class=3D"gmail_default=
" style=3D"font-family:comic sans ms,sans-serif;font-size:small">However, y=
ou conclude that solids are, to quote, &quot;not that &quot;solid&quot; as =
they may look&quot;. <br></div><div class=3D"gmail_default" style=3D"font-f=
amily:comic sans ms,sans-serif;font-size:small">From that statement I presu=
me that you are indicating that the solid material of the guide distorts or=
 deforms because it is constrained by the hole in the cylinder head.<br></d=
iv><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-ser=
if;font-size:small">Now I would ask you to refer to this video from=C2=A0Pu=
rdue University College of Technology: <br><a href=3D"https://www.youtube.c=
om/watch?v=3DV6D3QgdO5Bk" target=3D"_blank">https://www.youtube.com/watch?v=
=3DV6D3QgdO5Bk</a><br></div><div class=3D"gmail_default" style=3D"font-fami=
ly:comic sans ms,sans-serif;font-size:small">If you are not into the mathem=
atics just skip to 6:45 for the result.<br></div><div class=3D"gmail_defaul=
t" style=3D"font-family:comic sans ms,sans-serif;font-size:small">371,000 l=
bs (168tonnes)!!!<br></div><div class=3D"gmail_default" style=3D"font-famil=
y:comic sans ms,sans-serif;font-size:small">Now check the structural streng=
th of bronze... of course it varies a little with different alloys but a yi=
eld strength of 650 Mpa ( 94274 p.s.i.) is typical.<br></div><div class=3D"=
gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:smal=
l">The mathematics required to use these numbers to calculate the forces re=
quired to radially crush a cylinder (i.e. our valve guide)=C2=A0 are a litt=
le complex but be assured the numbers are MASSIVE.<br>So, if the wall of ou=
r guide is presumed to have an area of only 600 sq mm. (0.1 sq in), it woul=
d take 4276 kg (9427lbf)to distort or deform it. <br></div><div class=3D"gm=
ail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small"=
>Now, armed with that knowledge please read my <a href=3D"http://www.netbug=
.net/blogmichael/?p=3D384" target=3D"_blank">blog post</a> carefully and yo=
u may have an inkling for why I strongly advise against the use of bronze g=
uides in a cast iron head.<br><br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael S<br></di=
v><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-fam=
ily:comic sans ms,sans-serif;font-size:small"><br><br><br><br></div></div><=
div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, =
Mar 29, 2015 at 3:25 AM, Austin Healey <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;</s=
pan> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Yes. This is=
 happening. The head material expands less, the guide expand more, and thus=
 it has to go somewhere. Metals are not that &quot;solid&quot; as they migh=
t look like.<div><br></div><div>Gergo</div></div><div><div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">2015-03-29 4:09 GMT+02:00 Michael=
 Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a>&gt;</span>:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-=
family:comic sans ms,sans-serif;font-size:small">So Gergo, <br>if I underst=
and you correctly in a situation where the guide was not installed in a hea=
d and it was then heated the outside diameter and for that matter the insid=
e diameter of the guide would increase due to thermal expansion....correct?=
<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,s=
ans-serif;font-size:small">However, the difference, when the guide is insta=
lled in the head is that the head material, i.e. the hole that the guide is=
 installed in, would prevent the guide from expanding or, expressed another=
 way, because the hole in the head would not increase in diameter as much a=
s the guide would increase in diameter the head material would effectively =
compress the guide and prevent it from expanding..... correct?<br><br></div=
><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif=
;font-size:small">Michael S<br></div></div><div><div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Sat, Mar 28, 2015 at 4:38 PM, Austin=
 Healey <span dir=3D"ltr">&lt;<a href=3D"mailto:[email-masked]" targe=
t=3D"_blank">[email-masked]</a>&gt;</span> wrote:<br><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pad=
ding-left:1ex"><div dir=3D"ltr">Yes it does. The material has to expand som=
ewhere. It cant go in the oposite direction.<div><br></div><div>g</div></di=
v><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">2015-=
03-28 20:12 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailt=
o:[email-masked]" target=3D"_blank">[email-masked]</a>&gt=
;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div class=3D"=
gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:smal=
l">Hi Gergo, <br>just so I&#39;m clear...you are suggesting that the intern=
al diameter of the guide will get smaller as it heats up therefore that ext=
ra clearance is required?<br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">Michael S<br></div></di=
v><div><div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sa=
t, Mar 28, 2015 at 3:08 AM, Austin Healey <span dir=3D"ltr">&lt;<a href=3D"=
mailto:[email-masked]" target=3D"_blank">[email-masked]</a>&gt;=
</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .=
8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Bronze gu=
ides expand more when they heat up. Thats why You have to use greater clear=
ance. But when they work, the clearance will be the same. Worn out guides h=
ave two negative side effects: oil consumption, and premature wear on the v=
alves as they dissipate heat slower due to rocking on the valve seat. The e=
xhaust guides are more prone to oil consumption, exhaust guides are more pr=
one to overheating.<div><br></div><div>Gergo</div></div><div class=3D"gmail=
_extra"><br><div class=3D"gmail_quote"><div><div>2015-03-27 20:01 GMT+01:00=
 Michael Salter <span dir=3D"ltr">&lt;<a href=3D"mailto:michaelsalter@gmail=
.com" target=3D"_blank">[email-masked]</a>&gt;</span>:<br></div></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex"><div><div><div dir=3D"ltr"><div class=3D=
"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:sma=
ll">Hi Raymond, <br></div><div class=3D"gmail_default" style=3D"font-family=
:comic sans ms,sans-serif;font-size:small">The factory specification calls =
for 0.0025 to 0.0015 clearance for the inlets and 0.002 to 0.001 clearance =
for the exhausts if you are using cast iron guides however if you are using=
 bronze THAT WILL NOT WORK!!!<br></div><div class=3D"gmail_default" style=
=3D"font-family:comic sans ms,sans-serif;font-size:small">To be safe with b=
ronze guides you will have to hog them out to about 0.006&quot; clearance..=
which means there is really no point in replacing them.<br></div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small">I would point you to <a href=3D"http://www.netbug.net/blogmichael/?p=
=3D384" target=3D"_blank">this article</a> on my blog...been there done tha=
t...<br><br></div><div class=3D"gmail_default" style=3D"font-family:comic s=
ans ms,sans-serif;font-size:small">Michael S<br></div><div class=3D"gmail_d=
efault" style=3D"font-family:comic sans ms,sans-serif;font-size:small">BN1 =
#174<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quot=
e"><span>On Fri, Mar 27, 2015 at 2:17 PM, RAYMOND SMITHSON <span dir=3D"ltr=
">&lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">rjsmithson@sh=
aw.ca</a>&gt;</span> wrote:<br></span><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>=
<div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:10pt;co=
lor:#000000">I am rebuilding my 3000 cylinder head and have found the inlet=
 valve stems have .008&quot; clearance but the exhaust stems have only .002=
&quot; clearance. Does anyone know if this is common?</div></div><br></span=
>_______________________________________________<br>
</div>

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[email-masked]

--===============2015449731828728006==--

---

From: richard mayor <[email-masked]>
Date: Tue, 31 Mar 2015 01:51:44 +0000

--===============7627906790960767421==
	boundary="_9a9c84f6-8399-4b82-b10e-fa9256a4c620_"

--_9a9c84f6-8399-4b82-b10e-fa9256a4c620_
Content-Transfer-Encoding: quoted-printable

Wow!  That video took me back to my college algebra days. Although I was at=
tracted to science=2C then business=2C ultimately I decided to study law an=
d become an attorney.  I really hated those complicated convoluted algebrai=
c equations. =20

Now=2C to add fuel to the fire.  I believe that my engine builder has been =
using bronze valve guides in my race motors for over 30 years and I have ne=
ver had a problem. Is that possible now that I've read all these damning po=
sts about bronze valve guides?

Richard

Date: Sun=2C 29 Mar 2015 10:49:06 -0400
From: [email-masked]
To: [email-masked]
CC: [email-masked]
Subject: Re: [Healeys] valve guides

Ok Gergo=2C=20
>From your answer I believe that you would concur that both the ID and the O=
D of an unrestrained guide would increase as it is heated . i.e. thermal ex=
pansion.
However=2C you conclude that solids are=2C to quote=2C "not that "solid" as=
 they may look".=20
>From that statement I presume that you are indicating that the solid materi=
al of the guide distorts or deforms because it is constrained by the hole i=
n the cylinder head.
Now I would ask you to refer to this video from Purdue University College o=
f Technology:=20
https://www.youtube.com/watch?v=3DV6D3QgdO5Bk
If you are not into the mathematics just skip to 6:45 for the result.
371=2C000 lbs (168tonnes)!!!
Now check the structural strength of bronze... of course it varies a little=
 with different alloys but a yield strength of 650 Mpa ( 94274 p.s.i.) is t=
ypical.
The mathematics required to use these numbers to calculate the forces requi=
red to radially crush a cylinder (i.e. our valve guide)  are a little compl=
ex but be assured the numbers are MASSIVE.
So=2C if the wall of our guide is presumed to have an area of only 600 sq m=
m. (0.1 sq in)=2C it would take 4276 kg (9427lbf)to distort or deform it.=20
Now=2C armed with that knowledge please read my blog post carefully and you=
 may have an inkling for why I strongly advise against the use of bronze gu=
ides in a cast iron head.

Michael S

On Sun=2C Mar 29=2C 2015 at 3:25 AM=2C Austin Healey <[email-masked]>=
 wrote:
Yes. This is happening. The head material expands less=2C the guide expand =
more=2C and thus it has to go somewhere. Metals are not that "solid" as the=
y might look like.
Gergo
2015-03-29 4:09 GMT+02:00 Michael Salter <[email-masked]>:
So Gergo=2C=20
if I understand you correctly in a situation where the guide was not instal=
led in a head and it was then heated the outside diameter and for that matt=
er the inside diameter of the guide would increase due to thermal expansion=
....correct?
However=2C the difference=2C when the guide is installed in the head is tha=
t the head material=2C i.e. the hole that the guide is installed in=2C woul=
d prevent the guide from expanding or=2C expressed another way=2C because t=
he hole in the head would not increase in diameter as much as the guide wou=
ld increase in diameter the head material would effectively compress the gu=
ide and prevent it from expanding..... correct?

Michael S

On Sat=2C Mar 28=2C 2015 at 4:38 PM=2C Austin Healey <[email-masked]>=
 wrote:
Yes it does. The material has to expand somewhere. It cant go in the oposit=
e direction.
g
2015-03-28 20:12 GMT+01:00 Michael Salter <[email-masked]>:
Hi Gergo=2C=20
just so I'm clear...you are suggesting that the internal diameter of the gu=
ide will get smaller as it heats up therefore that extra clearance is requi=
red?
Michael S

On Sat=2C Mar 28=2C 2015 at 3:08 AM=2C Austin Healey <[email-masked]>=
 wrote:
Bronze guides expand more when they heat up. Thats why You have to use grea=
ter clearance. But when they work=2C the clearance will be the same. Worn o=
ut guides have two negative side effects: oil consumption=2C and premature =
wear on the valves as they dissipate heat slower due to rocking on the valv=
e seat. The exhaust guides are more prone to oil consumption=2C exhaust gui=
des are more prone to overheating.
Gergo
2015-03-27 20:01 GMT+01:00 Michael Salter <[email-masked]>:
Hi Raymond=2C=20
The factory specification calls for 0.0025 to 0.0015 clearance for the inle=
ts and 0.002 to 0.001 clearance for the exhausts if you are using cast iron=
 guides however if you are using bronze THAT WILL NOT WORK!!!
To be safe with bronze guides you will have to hog them out to about 0.006"=
 clearance..which means there is really no point in replacing them.
I would point you to this article on my blog...been there done that...

Michael S
BN1 #174

On Fri=2C Mar 27=2C 2015 at 2:17 PM=2C RAYMOND SMITHSON <[email-masked]=
> wrote:
I am rebuilding my 3000 cylinder head and have found the inlet valve stems =
have .008" clearance but the exhaust stems have only .002" clearance. Does =
anyone know if this is common?
_______________________________________________
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--=20
If you can't fix it with a hammer=2C you've got an electrical problem.

=0A=
=0A=

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[email-masked]
=0A=
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=0A=

=0A=

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--=20
If you can't fix it with a hammer=2C you've got an electrical problem.

=0A=
=0A=

=0A=

--=20
If you can't fix it with a hammer=2C you've got an electrical problem.

=0A=
=0A=

=0A=

--=20
If you can't fix it with a hammer=2C you've got an electrical problem.

=0A=
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--_9a9c84f6-8399-4b82-b10e-fa9256a4c620_
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<html>
<head>
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<body class=3D'hmmessage'><div dir=3D'ltr'>Wow!&nbsp=3B That video took me =
back to my college algebra days. Although I was attracted to science=2C the=
n business=2C ultimately I decided to study law and become an attorney.&nbs=
p=3B I really hated those complicated convoluted algebraic equations.&nbsp=
=3B <br><br>Now=2C to add fuel to the fire.&nbsp=3B I believe that my engin=
e builder has been using bronze valve guides in my race motors for over 30 =
years and I have never had a problem. Is that possible now that I've read a=
ll these damning posts about bronze valve guides?<br><br>Richard<br><br><di=
v><hr id=3D"stopSpelling">Date: Sun=2C 29 Mar 2015 10:49:06 -0400<br>From: =
[email-masked]<br>To: [email-masked]<br>CC: [email-masked]=
am.net<br>Subject: Re: [Healeys] valve guides<br><br><div dir=3D"ltr"><div =
class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csans-serif=
=3Bfont-size:small=3B">Ok Gergo=2C <br></div><div class=3D"ecxgmail_default=
" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">We =
are making progress....<br></div><div class=3D"ecxgmail_default" style=3D"f=
ont-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">From your answe=
r I believe that you would concur that both the ID and the OD of an unrestr=
ained guide would increase as it is heated . i.e. thermal expansion.<br></d=
iv><div class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csan=
s-serif=3Bfont-size:small=3B">However=2C you conclude that solids are=2C to=
 quote=2C "not that "solid" as they may look". <br></div><div class=3D"ecxg=
mail_default" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:s=
mall=3B">From that statement I presume that you are indicating that the sol=
id material of the guide distorts or deforms because it is constrained by t=
he hole in the cylinder head.<br></div><div class=3D"ecxgmail_default" styl=
e=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">Now I wou=
ld ask you to refer to this video from&nbsp=3BPurdue University College of =
Technology: <br><a href=3D"https://www.youtube.com/watch?v=3DV6D3QgdO5Bk" t=
arget=3D"_blank">https://www.youtube.com/watch?v=3DV6D3QgdO5Bk</a><br></div=
><div class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csans-=
serif=3Bfont-size:small=3B">If you are not into the mathematics just skip t=
o 6:45 for the result.<br></div><div class=3D"ecxgmail_default" style=3D"fo=
nt-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">371=2C000 lbs (1=
68tonnes)!!!<br></div><div class=3D"ecxgmail_default" style=3D"font-family:=
comic sans ms=2Csans-serif=3Bfont-size:small=3B">Now check the structural s=
trength of bronze... of course it varies a little with different alloys but=
 a yield strength of 650 Mpa ( 94274 p.s.i.) is typical.<br></div><div clas=
s=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csans-serif=3Bfo=
nt-size:small=3B">The mathematics required to use these numbers to calculat=
e the forces required to radially crush a cylinder (i.e. our valve guide)&n=
bsp=3B are a little complex but be assured the numbers are MASSIVE.<br>So=
=2C if the wall of our guide is presumed to have an area of only 600 sq mm.=
 (0.1 sq in)=2C it would take 4276 kg (9427lbf)to distort or deform it. <br=
></div><div class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=
=2Csans-serif=3Bfont-size:small=3B">Now=2C armed with that knowledge please=
 read my <a href=3D"http://www.netbug.net/blogmichael/?p=3D384" target=3D"_=
blank">blog post</a> carefully and you may have an inkling for why I strong=
ly advise against the use of bronze guides in a cast iron head.<br><br></di=
v><div class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csans=
-serif=3Bfont-size:small=3B">Michael S<br></div><div class=3D"ecxgmail_defa=
ult" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">=
<br></div><div class=3D"ecxgmail_default" style=3D"font-family:comic sans m=
s=2Csans-serif=3Bfont-size:small=3B"><br><br><br><br></div></div><div class=
=3D"ecxgmail_extra"><br><div class=3D"ecxgmail_quote">On Sun=2C Mar 29=2C 2=
015 at 3:25 AM=2C Austin Healey <span dir=3D"ltr">&lt=3B<a href=3D"mailto:p=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt=3B</span=
> wrote:<br><blockquote class=3D"ecxgmail_quote" style=3D"border-left:1px #=
ccc solid=3Bpadding-left:1ex=3B"><div dir=3D"ltr">Yes. This is happening. T=
he head material expands less=2C the guide expand more=2C and thus it has t=
o go somewhere. Metals are not that "solid" as they might look like.<div><b=
r></div><div>Gergo</div></div><div class=3D"ecxHOEnZb"><div class=3D"h5"><d=
iv class=3D"ecxgmail_extra"><br><div class=3D"ecxgmail_quote">2015-03-29 4:=
09 GMT+02:00 Michael Salter <span dir=3D"ltr">&lt=3B<a href=3D"mailto:micha=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt=3B</sp=
an>:<br><blockquote class=3D"ecxgmail_quote" style=3D"border-left:1px #ccc =
solid=3Bpadding-left:1ex=3B"><div dir=3D"ltr"><div class=3D"ecxgmail_defaul=
t" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">So=
 Gergo=2C <br>if I understand you correctly in a situation where the guide =
was not installed in a head and it was then heated the outside diameter and=
 for that matter the inside diameter of the guide would increase due to the=
rmal expansion....correct?<br></div><div class=3D"ecxgmail_default" style=
=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">However=2C=
 the difference=2C when the guide is installed in the head is that the head=
 material=2C i.e. the hole that the guide is installed in=2C would prevent =
the guide from expanding or=2C expressed another way=2C because the hole in=
 the head would not increase in diameter as much as the guide would increas=
e in diameter the head material would effectively compress the guide and pr=
event it from expanding..... correct?<br><br></div><div class=3D"ecxgmail_d=
efault" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=
=3B">Michael S<br></div></div><div><div><div class=3D"ecxgmail_extra"><br><=
div class=3D"ecxgmail_quote">On Sat=2C Mar 28=2C 2015 at 4:38 PM=2C Austin =
Healey <span dir=3D"ltr">&lt=3B<a href=3D"mailto:[email-masked]" targ=
et=3D"_blank">[email-masked]</a>&gt=3B</span> wrote:<br><blockquote c=
lass=3D"ecxgmail_quote" style=3D"border-left:1px #ccc solid=3Bpadding-left:=
1ex=3B"><div dir=3D"ltr">Yes it does. The material has to expand somewhere.=
 It cant go in the oposite direction.<div><br></div><div>g</div></div><div>=
<div><div class=3D"ecxgmail_extra"><br><div class=3D"ecxgmail_quote">2015-0=
3-28 20:12 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt=3B<a href=3D"mail=
to:[email-masked]" target=3D"_blank">[email-masked]</a>&g=
t=3B</span>:<br><blockquote class=3D"ecxgmail_quote" style=3D"border-left:1=
px #ccc solid=3Bpadding-left:1ex=3B"><div dir=3D"ltr"><div class=3D"ecxgmai=
l_default" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:smal=
l=3B">Hi Gergo=2C <br>just so I'm clear...you are suggesting that the inter=
nal diameter of the guide will get smaller as it heats up therefore that ex=
tra clearance is required?<br></div><div class=3D"ecxgmail_default" style=
=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">Michael S<=
br></div></div><div><div><div class=3D"ecxgmail_extra"><br><div class=3D"ec=
xgmail_quote">On Sat=2C Mar 28=2C 2015 at 3:08 AM=2C Austin Healey <span di=
r=3D"ltr">&lt=3B<a href=3D"mailto:[email-masked]" target=3D"_blank">p=
[email-masked]</a>&gt=3B</span> wrote:<br><blockquote class=3D"ecxgmai=
l_quote" style=3D"border-left:1px #ccc solid=3Bpadding-left:1ex=3B"><div di=
r=3D"ltr">Bronze guides expand more when they heat up. Thats why You have t=
o use greater clearance. But when they work=2C the clearance will be the sa=
me. Worn out guides have two negative side effects: oil consumption=2C and =
premature wear on the valves as they dissipate heat slower due to rocking o=
n the valve seat. The exhaust guides are more prone to oil consumption=2C e=
xhaust guides are more prone to overheating.<div><br></div><div>Gergo</div>=
</div><div class=3D"ecxgmail_extra"><br><div class=3D"ecxgmail_quote"><div>=
<div>2015-03-27 20:01 GMT+01:00 Michael Salter <span dir=3D"ltr">&lt=3B<a h=
ref=3D"mailto:[email-masked]" target=3D"_blank">michaelsalter@gmai=
l.com</a>&gt=3B</span>:<br></div></div><blockquote class=3D"ecxgmail_quote"=
 style=3D"border-left:1px #ccc solid=3Bpadding-left:1ex=3B"><div><div><div =
dir=3D"ltr"><div class=3D"ecxgmail_default" style=3D"font-family:comic sans=
 ms=2Csans-serif=3Bfont-size:small=3B">Hi Raymond=2C <br></div><div class=
=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Csans-serif=3Bfon=
t-size:small=3B">The factory specification calls for 0.0025 to 0.0015 clear=
ance for the inlets and 0.002 to 0.001 clearance for the exhausts if you ar=
e using cast iron guides however if you are using bronze THAT WILL NOT WORK=
!!!<br></div><div class=3D"ecxgmail_default" style=3D"font-family:comic san=
s ms=2Csans-serif=3Bfont-size:small=3B">To be safe with bronze guides you w=
ill have to hog them out to about 0.006" clearance..which means there is re=
ally no point in replacing them.<br></div><div class=3D"ecxgmail_default" s=
tyle=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=3B">I woul=
d point you to <a href=3D"http://www.netbug.net/blogmichael/?p=3D384" targe=
t=3D"_blank">this article</a> on my blog...been there done that...<br><br><=
/div><div class=3D"ecxgmail_default" style=3D"font-family:comic sans ms=2Cs=
ans-serif=3Bfont-size:small=3B">Michael S<br></div><div class=3D"ecxgmail_d=
efault" style=3D"font-family:comic sans ms=2Csans-serif=3Bfont-size:small=
=3B">BN1 #174<br></div></div><div class=3D"ecxgmail_extra"><br><div class=
=3D"ecxgmail_quote"><span>On Fri=2C Mar 27=2C 2015 at 2:17 PM=2C RAYMOND SM=
ITHSON <span dir=3D"ltr">&lt=3B<a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a>&gt=3B</span> wrote:<br></span><blockquot=
e class=3D"ecxgmail_quote" style=3D"border-left:1px #ccc solid=3Bpadding-le=
ft:1ex=3B"><span><div><div style=3D"font-family:arial=2Chelvetica=2Csans-se=
rif=3Bfont-size:10pt=3Bcolor:#000000=3B">I am rebuilding my 3000 cylinder h=
ead and have found the inlet valve stems have .008" clearance but the exhau=
st stems have only .002" clearance. Does anyone know if this is common?</di=
v></div><br></span>_______________________________________________<br>=0A=
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lor:black=3B">If you can't fix it with a hammer=2C you've got an electrical=
 problem.</span></i><br><br><div></div><div></div><div></div></div></div></=
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with a hammer=2C you've got an electrical problem.</span></i><br><br><div><=
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an't fix it with a hammer=2C you've got an electrical problem.</span></i><b=
r><br><div></div><div></div><div></div></div></div></div></div>=0A=
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le=3D"color:black=3B">If you can't fix it with a hammer=2C you've got an el=
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