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Re: [Healeys] valve guides

To: Austin Healey <pajtamuvek@gmail.com>
Subject: Re: [Healeys] valve guides
From: Michael Salter <michaelsalter@gmail.com>
Date: Sat, 28 Mar 2015 22:09:12 -0400
Cc: "healeys@autox.team.net" <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <11845844.18350440.1427480243323.JavaMail.root@shaw.ca> <CAB3i7LKpx2C-QkV6Nedp2QdPLjJn7fBEG+k6LJDiZVKGnuiVmw@mail.gmail.com> <CA+QDXmAcZJJ+oWZREp6wTF8eR0pd51bfsDKmJEacs5vFUz2taw@mail.gmail.com> <CAB3i7LKC+dUV3n7YfMLSEuX1_NAp5Y6e3qy6BXawkGVGJDkQwg@mail.gmail.com> <CA+QDXmAq4ZJz0fxZ8pbJToLNWGLVTSzM4XB1DG2q7Jja0E1c_w@mail.gmail.com>
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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 <pajtamuvek@gmail.com> wrote:

> Yes it does. The material has to expand somewhere. It cant go in the
> oposite direction.
>
> g
>
> 2015-03-28 20:12 GMT+01:00 Michael Salter <michaelsalter@gmail.com>:
>
>> 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 <pajtamuvek@gmail.com>
>> 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 <michaelsalter@gmail.com>:
>>>
>>>> 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 <rjsmithson@shaw.ca>
>>>> 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?
>>>>>
>>>>> _______________________________________________
>>>>> Support Team.Net http://www.team.net/donate.html
>>>>> Suggested annual donation  $12.75
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>>>>>
>>>>> Healeys@autox.team.net
>>>>> http://autox.team.net/mailman/listinfo/healeys
>>>>>
>>>>> Unsubscribe/Manage:
>>>>> http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> *If you can't fix it with a hammer, you've got an electrical problem.*
>>>>
>>>>
>>>> _______________________________________________
>>>> Support Team.Net http://www.team.net/donate.html
>>>> Suggested annual donation  $12.75
>>>> Archive: http://www.team.net/archive
>>>> Forums: http://www.team.net/forums
>>>>
>>>> Healeys@autox.team.net
>>>> http://autox.team.net/mailman/listinfo/healeys
>>>>
>>>> Unsubscribe/Manage:
>>>> http://autox.team.net/mailman/options/healeys/pajtamuvek@gmail.com
>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> *If you can't fix it with a hammer, you've got an electrical problem.*
>>
>>
>


-- 
*If you can't fix it with a hammer, you've got an electrical problem.*

--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:pajtamuvek@gmail.com"; 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:michaelsalter@gmail.com"; target=3D"_blank">michaelsalter@gmail.c=
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:pajtamuvek@gmail.com"; target=3D"_blank">pajtamuvek@gmail.co=
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=
ter@gmail.com" target=3D"_blank">michaelsalter@gmail.com</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:rjsmithson@shaw.ca"; target=3D"_blank">rjsmit=
hson@shaw.ca</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>
nk">http://www.team.net/donate.html</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>
<br>_______________________________________________<br>
nk">http://www.team.net/donate.html</a><br>
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ions/healeys/pajtamuvek@gmail.com</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 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>

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