Subject: [Fot] TR4 head milling

From: GREGORY THOMPSON via Fot <[email-masked]>
Date: Fri, 5 Apr 2024 11:27:39 +0000 (UTC)

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Has anyone had an issue with breaking into a water jacket on the TR4A head =
with taking off .150?
Thank you,
Greg Thompson=C2=A0
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<html><head></head><body>Has anyone had an issue with breaking into a water jacket on the TR4A head with taking off .150?<div><br></div><div><div class="ydp72b54109yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div>Thank you,</div><div><br></div><div class="ydp72b54109signature">Greg Thompson&nbsp;</div></div></div></div></body></html>
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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: Tony Drews via Fot <[email-masked]>
Date: Sat, 6 Apr 2024 13:54:44 -0500

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Working with my dad (uncle jack) we considered 0.130 to 0.150 "normal" 
to mill, 0.190 to be where it started to get dangerous. That said, there 
is some variability from head to head on where the internal water 
passages are.

Regards, Tony

On 4/5/2024 6:27 AM, GREGORY THOMPSON via Fot wrote:
> Has anyone had an issue with breaking into a water jacket on the TR4A 
> head with taking off .150?
>
> Thank you,
>
> Greg Thompson
>
> Donate:http://www.team.net/donate.html
> Archive:http://autox.team.net/archive  http://www.team.net/pipermail/fot
> Unsubscribe/Manage:http://autox.team.net/mailman/options/fot/[email-masked]
>
>
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    <p>Working with my dad (uncle jack) we considered 0.130 to 0.150
      "normal" to mill, 0.190 to be where it started to get dangerous. 
      That said, there is some variability from head to head on where
      the internal water passages are.</p>
    <p>Regards, Tony<br>
    </p>
    <div class="moz-cite-prefix">On 4/5/2024 6:27 AM, GREGORY THOMPSON
      via Fot wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      Has anyone had an issue with breaking into a water jacket on the
      TR4A head with taking off .150?
      <div><br>
      </div>
      <div>
        <div class="ydp72b54109yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;">
          <div>
            <div>Thank you,</div>
            <div><br>
            </div>
            <div class="ydp72b54109signature">Greg Thompson </div>
          </div>
        </div>
      </div>
      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:[email-masked]">[email-masked]</a>

<a class="moz-txt-link-freetext" href="http://www.fot-racing.com">http://www.fot-racing.com</a>

Archive: <a class="moz-txt-link-freetext" href="http://autox.team.net/archive">http://autox.team.net/archive</a> <a class="moz-txt-link-freetext" href="http://www.team.net/pipermail/fot">http://www.team.net/pipermail/fot</a>

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From: Ken Knight via Fot <[email-masked]>
Date: Sat, 6 Apr 2024 15:11:10 -0700

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I would agree with Tony.  Given that you never know if the casting of your =
head is thin at some location it is better to start on the conservative sid=
e.  Better to leave a little power for next time than ruin a head you have =
lots of work in.  I say this because there is far more power in the valves =
and porting than a .010 cut off the head for more compression.  Ken

Sent from Mail for Windows

From: Tony Drews via Fot
Sent: Saturday, April 6, 2024 1:50 PM
To: GREGORY THOMPSON; FOT Triumph
Subject: Re: [Fot] TR4 head milling

Working with my dad (uncle jack) we considered 0.130 to 0.150 "normal" to m=
ill, 0.190 to be where it started to get dangerous.=C2=A0 That said, there =
is some variability from head to head on where the internal water passages =
are.
Regards, Tony
On 4/5/2024 6:27 AM, GREGORY THOMPSON via Fot wrote:
Has anyone had an issue with breaking into a water jacket on the TR4A head =
with taking off .150?=20

Thank you,

Greg Thompson=C2=A0

s.com

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<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" xmlns:w=3D"urn:sc=
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72" style=3D=
'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>I wou=
ld agree with Tony.=C2=A0 Given that you never know if the casting of your =
head is thin at some location it is better to start on the conservative sid=
e. =C2=A0Better to leave a little power for next time than ruin a head you =
have lots of work in.=C2=A0 I say this because there is far more power in t=
he valves and porting than a .010 cut off the head for more compression.=C2=
=A0 Ken</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>S=
ent from <a href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986">Mail<=
/a> for Windows</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div style=3D'=
mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padd=
ing:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D'border:none;padding:0i=
n'><b>From: </b><a href=3D"mailto:[email-masked]">Tony Drews via Fot</a=
><br><b>Sent: </b>Saturday, April 6, 2024 1:50 PM<br><b>To: </b><a href=3D"=
mailto:[email-masked]">GREGORY THOMPSON</a>; <a href=3D"mailto:fot@a=
utox.team.net">FOT Triumph</a><br><b>Subject: </b>Re: [Fot] TR4 head millin=
g</p></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>Working with my dad=
 (uncle jack) we considered 0.130 to 0.150 &quot;normal&quot; to mill, 0.19=
0 to be where it started to get dangerous.&nbsp; That said, there is some v=
ariability from head to head on where the internal water passages are.</p><=
p>Regards, Tony</p><div><p class=3DMsoNormal>On 4/5/2024 6:27 AM, GREGORY T=
HOMPSON via Fot wrote:<o:p></o:p></p></div><blockquote style=3D'margin-top:=
5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal>Has anyone had an issue wit=
h breaking into a water jacket on the TR4A head with taking off .150? <o:p>=
</o:p></p><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><div><d=
iv><div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"H=
elvetica",sans-serif'>Thank you,<o:p></o:p></span></p></div><div><p class=
=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Helvetica",sans-s=
erif'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span sty=
le=3D'font-size:12.0pt;font-family:"Helvetica",sans-serif'>Greg Thompson&nb=
sp;<o:p></o:p></span></p></div></div></div></div><p class=3DMsoNormal><br><=
br><o:p></o:p></p><pre>_______________________________________________</pre=
><pre><a href=3D"mailto:[email-masked]">[email-masked]</a></pre><pr=
e><o:p>&nbsp;</o:p></pre><pre><a href=3D"http://www.fot-racing.com">http://=
www.fot-racing.com</a></pre><pre><o:p>&nbsp;</o:p></pre><pre>Donate: <a hre=
f=3D"http://www.team.net/donate.html">http://www.team.net/donate.html</a></=
pre><pre>Archive: <a href=3D"http://autox.team.net/archive">http://autox.te=
am.net/archive</a> <a href=3D"http://www.team.net/pipermail/fot">http://www=
.team.net/pipermail/fot</a></pre><pre>Unsubscribe/Manage: <a href=3D"http:/=
/autox.team.net/mailman/options/fot/[email-masked]">http://autox.team.n=
et/mailman/options/fot/[email-masked]</a></pre><pre><o:p>&nbsp;</o:p></=
pre></blockquote><pre style=3D'mso-margin-top-alt:0in;margin-right:.5in;mar=
gin-bottom:5.0pt;margin-left:.5in'><o:p>&nbsp;</o:p></pre><p class=3DMsoNor=
mal><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>=
<o:p>&nbsp;</o:p></span></p></div></body></html>=

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From: "TeriAnn J. Wakeman via Fot" <[email-masked]>
Date: Sat, 6 Apr 2024 16:46:46 -0700

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Just a comment or two from my archives:

According to Ken Gillanders, the stock head measures between 3.325 and 
3.330 from the valve cover gasket surface to the head gasket surface. So 
be sure to check the head height in case they head had previously been 
shaved. When the head casting was changed to include a diagonal flat 
section on the underside of the lower thermostat housing the thickness 
of metal between the bottom of the head and the internal water passages 
was increased. So I suggest not shaving the earlier heads with rounded 
lower thermostat housing beyond surfacing shaves.

> *Sent: *Saturday, April 6, 2024 1:50 PM
> *Subject: *Re: [Fot] TR4 head milling
>
> to mill, 0.190 to be where it started to get dangerous.  That said, 
> there is some variability from head to head on where the internal 
> water passages are.
>

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    <p>Just a comment or two from my archives:</p>
    <p>According to Ken Gillanders, the stock head measures between
      3.325 and 3.330 from the valve cover gasket surface to the head
      gasket surface. So be sure to check the head height in case they
      head had previously been shaved. When the head casting was changed
      to include a diagonal flat section on the underside of the lower
      thermostat housing the thickness of metal between the bottom of
      the head and the internal water passages was increased. So I
      suggest not shaving the earlier heads with rounded lower
      thermostat housing beyond surfacing shaves.<br>
    </p>
    <blockquote type="cite"
cite="mid:[email-masked]">
      <div class="WordSection1">
        <div
style="mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
          <p class="MsoNormal" style="border:none;padding:0in"><b>From:
            </b><a href="mailto:[email-masked]"
              moz-do-not-send="true">Tony Drews via Fot</a><br>
            <b>Sent: </b>Saturday, April 6, 2024 1:50 PM<br>
            <b>To: </b><a href="mailto:[email-masked]"
              moz-do-not-send="true">GREGORY THOMPSON</a>; <a
              href="mailto:[email-masked]" moz-do-not-send="true">FOT
              Triumph</a><br>
            <b>Subject: </b>Re: [Fot] TR4 head milling</p>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p>Working with my dad (uncle jack) we considered 0.130 to 0.150
          "normal" to mill, 0.190 to be where it started to get
          dangerous.  That said, there is some variability from head to
          head on where the internal water passages are.</p>
      </div>
    </blockquote>
    <br>
  </body>
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From: fubog1 via Fot <[email-masked]>
Date: Sun, 7 Apr 2024 13:07:20 +0000 (UTC)

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 Yes, a slight piston dome, I use around 6cc, eliminates the need to cut th=
e head so much, & doesn't interfere w/flame travel/combustion.When you get =
down to around 3.150 thick, things get iffy...
Also when establishing CR, book recommendations are just that, general star=
ting points; valve head type & seat depth affect chamber volume, so it's be=
st to cut the head after all else has been established.
Glen Efinger

    On Sunday, April 7, 2024 at 02:36:01 AM EDT, tr4 via Fot <[email-masked]=
m.net> wrote: =20
=20
 I have never had to go that far.=C2=A0 The problem would be not the combus=
tion chamber but the flat surface would be way too thin and collapse in sho=
rt order.=C2=A0 You would be much better off with popping the piston or go =
with a slight done to get that level of compression.

Sent via the Samsung Galaxy S23+ 5G, an AT&T 5G smartphone

-------- Original message --------From: GREGORY THOMPSON via Fot <fot@autox=
.team.net> Date: 4/5/24 6:36 PM (GMT-06:00) To: FOT Triumph <[email-masked]=
.net> Subject: [Fot] TR4 head milling=20
Has anyone had an issue with breaking into a water jacket on the TR4A head =
with taking off .150?
Thank you,
Greg Thompson=C2=A0_______________________________________________
[email-masked]

m

 =20
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<html><head></head><body><div class=3D"ydp6741c26cyahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Yes, a slight piston dome, I=
 use around 6cc, eliminates the need to cut the head so much, &amp; doesn't=
 interfere w/flame travel/combustion.</div><div dir=3D"ltr" data-setdir=3D"=
false">When you get down to around 3.150 thick, things get iffy...<br></div=
><div dir=3D"ltr" data-setdir=3D"false">Also when establishing CR, book rec=
ommendations are just that, general starting points; valve head type &amp; =
seat depth affect chamber volume, so it's best to cut the head after all el=
se has been established.</div><div dir=3D"ltr" data-setdir=3D"false"><br></=
div><div dir=3D"ltr" data-setdir=3D"false">Glen Efinger<br></div><div><br><=
/div>
       =20
        </div><div id=3D"ydpac5ed56fyahoo_quoted_3363452919" class=3D"ydpac=
5ed56fyahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                        On Sunday, April 7, 2024 at 02:36:01 AM EDT, tr4 vi=
a Fot &lt;[email-masked]&gt; wrote:
                    </div>
                    <div><br></div>
                    <div><br></div>
               =20
               =20
                <div><div id=3D"ydpac5ed56fyiv9068450430"><div><div>I have =
never had to go that far.&nbsp; The problem would be not the combustion cha=
mber but the flat surface would be way too thin and collapse in short order=
.&nbsp; You would be much better off with popping the piston or go with a s=
light done to get that level of compression.</div><div><br clear=3D"none"><=
/div><div><br clear=3D"none"></div><div><br clear=3D"none"></div><div id=3D=
"ydpac5ed56fyiv9068450430composer_signature"><div style=3D"font-size:12px;c=
olor:#575757;">Sent via the Samsung Galaxy S23+ 5G, an AT&amp;T 5G smartpho=
ne</div></div><div><br clear=3D"none"></div><div><br clear=3D"none"></div><=
div style=3D"font-size:100%;color:#000000;" align=3D"left"><div id=3D"ydpac=
5ed56fyiv9068450430yqtfd17335" class=3D"ydpac5ed56fyiv9068450430yqt39316644=
33"><div>-------- Original message --------</div><div>From: GREGORY THOMPSO=
N via Fot &lt;[email-masked]&gt; </div><div>Date: 4/5/24  6:36 PM  (GMT=
-06:00) </div><div>To: FOT Triumph &lt;[email-masked]&gt; </div><div>Su=
bject: [Fot] TR4 head milling </div><div><br clear=3D"none"></div></div></d=
iv><div id=3D"ydpac5ed56fyiv9068450430yqtfd96139" class=3D"ydpac5ed56fyiv90=
68450430yqt3931664433">Has anyone had an issue with breaking into a water j=
acket on the TR4A head with taking off .150?<div><br clear=3D"none"></div><=
div><div style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;=
font-size:16px;" class=3D"ydpac5ed56fyiv9068450430ydp72b54109yahoo-style-wr=
ap"><div><div>Thank you,</div><div><br clear=3D"none"></div><div class=3D"y=
dpac5ed56fyiv9068450430ydp72b54109signature">Greg Thompson&nbsp;</div></div=
></div></div></div></div></div><div class=3D"ydpac5ed56fyqt3931664433" id=
=3D"ydpac5ed56fyqtfd78316">_______________________________________________<=
br clear=3D"none"><a shape=3D"rect" href=3D"mailto:[email-masked]" rel=
=3D"nofollow" target=3D"_blank">[email-masked]</a><br clear=3D"none"><b=
r clear=3D"none"><a shape=3D"rect" href=3D"http://www.fot-racing.com" rel=
=3D"nofollow" target=3D"_blank">http://www.fot-racing.com</a><br clear=3D"n=
one"><br clear=3D"none">Donate: <a shape=3D"rect" href=3D"http://www.team.n=
et/donate.html" rel=3D"nofollow" target=3D"_blank">http://www.team.net/dona=
te.html</a><br clear=3D"none">Archive: <a shape=3D"rect" href=3D"http://aut=
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et/archive</a> <a shape=3D"rect" href=3D"http://www.team.net/pipermail/fot"=
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From: Mordy Dunst via Fot <[email-masked]>
Date: Sun, 7 Apr 2024 19:26:09 +0000 (UTC)

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Some years back Kas came over. =C2=A0We studied heads. =C2=A0I cut a stock =
head on a band saw at different places. Kinda looked at it deeply. =C2=A0I =
mentioned that the only best way to get 14.5: 1 CR is to make the combustio=
n chamber small and keep the thickness of the head stock. Utilizing flat to=
p pistons. =C2=A0( he did not like pop ups).=C2=A0=C2=A0
Easy to do once you weld up the combustion chamber and mill the chamber to =
a known volume. While at it make the intake runner better and sized right. =
=C2=A0Need custom length=C2=A0longer=C2=A0valves too.=C2=A0
Made three of these=C2=A0alum=C2=A0heads. =C2=A0Alas the first one was unfo=
rtunately expendable - found out limits=C2=A0what we could grind.

Oh=E2=80=A6 they are seriously light.=C2=A0

Good stuff. =C2=A0

Sent from the all new AOL app for iOS

On Saturday, April 6, 2024, 7:30 PM, GREGORY THOMPSON via Fot <[email-masked]=
am.net> wrote:

gte.net

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dy>
Some years back Kas came over. &nbsp;We studied heads. &nbsp;I cut a stock =
head on a band saw at different places. Kinda looked at it deeply. &nbsp;I =
mentioned that the only best way to get 14.5: 1 CR is to make the combustio=
n chamber small and keep the thickness of the head stock. Utilizing flat to=
p pistons. &nbsp;( he did not like pop ups).&nbsp;&nbsp;<div><span style=3D=
"-webkit-text-size-adjust: auto;"><br></span></div><div><span style=3D"-web=
kit-text-size-adjust: auto;">Easy to do once you weld up the combustion cha=
mber and mill the chamber to a known volume. While at it make the intake ru=
nner better and sized right. &nbsp;Need custom length&nbsp;longer&nbsp;valv=
es too.&nbsp;</span></div><div><span style=3D"-webkit-text-size-adjust: aut=
o;"><br></span></div><div><span style=3D"-webkit-text-size-adjust: auto;">M=
ade three of these&nbsp;alum&nbsp;heads. &nbsp;Alas the first one was unfor=
tunately expendable - found out limits&nbsp;what we could grind.</span></di=
v><div><span style=3D"-webkit-text-size-adjust: auto;"><br></span></div><di=
v><span style=3D"-webkit-text-size-adjust: auto;"><br></span></div><div><sp=
an style=3D"-webkit-text-size-adjust: auto;">Oh=E2=80=A6 they are seriously=
 light.&nbsp;</span></div><div><span style=3D"-webkit-text-size-adjust: aut=
o;"><br></span></div><div><span style=3D"-webkit-text-size-adjust: auto;"><=
br></span></div><div><span style=3D"-webkit-text-size-adjust: auto;"><br></=
span></div><div><span style=3D"-webkit-text-size-adjust: auto;"><br></span>=
</div><div><span style=3D"-webkit-text-size-adjust: auto;">Good stuff. &nbs=
p;</span></div><div><span style=3D"-webkit-text-size-adjust: auto;"><br></s=
pan></div><div><br><br><div class=3D"yahoo-signature"><a href=3D"https://ap=
ps.apple.com/us/app/aol-news-email-weather-video/id646100661">Sent from the=
 all new AOL app for iOS</a><br></div><br><p class=3D"yahoo-quoted-begin" s=
tyle=3D"font-size: 15px; color: #715FFA; padding-top: 15px; margin-top: 0">=
On Saturday, April 6, 2024, 7:30 PM, GREGORY THOMPSON via Fot &lt;fot@autox=
.team.net&gt; wrote:</p><blockquote class=3D"iosymail"><div id=3D"yiv376233=
9536"><div>Has anyone had an issue with breaking into a water jacket on the=
 TR4A head with taking off .150?<div><br></div><div><div style=3D"font-fami=
ly:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class=3D"y=
iv3762339536ydp72b54109yahoo-style-wrap"><div><div>Thank you,</div><div><br=
></div><div class=3D"yiv3762339536ydp72b54109signature">Greg Thompson&nbsp;=
</div></div></div></div></div></div>_______________________________________=
________<br><a ymailto=3D"mailto:[email-masked]" href=3D"mailto:fot@aut=
ox.team.net">[email-masked]</a><br><br><a href=3D"http://www.fot-racing=
.com" target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a hre=
f=3D"http://www.team.net/donate.html" target=3D"_blank">http://www.team.net=
/donate.html</a><br>Archive: <a href=3D"http://autox.team.net/archive" targ=
et=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://www.team.=
net/pipermail/fot" target=3D"_blank">http://www.team.net/pipermail/fot</a><=
br>Unsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/fot=
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ons/fot/[email-masked]</a><br><br><br><blockquote></blockquote></bloc=
kquote></div>
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From: JIm Gray via Fot <[email-masked]>
Date: Sun, 7 Apr 2024 21:53:10 -0600 boundary="----=_NextPart_000_0031_01DA8935.FC375E50"

This is a multipart message in MIME format.

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Yep, been there, done that. Combustion chambers too. Put a lot of weld =
in the exhaust valve pockets. It is not fun hand grinding cast iron but =
it was worth it, moths later. The thing really flows though. Added a =
bunch of aluminum to the intake and removed just as much. I never got it =
to flow as well as the head so went with dual DCOE=E2=80=99s. I did =
minimal milling and use pop up pistons to get my compression. 13.2:1.

Jim g

=20

=20

From: Fot <[email-masked]> On Behalf Of Mordy Dunst via Fot
Sent: Sunday, April 7, 2024 1:26 PM
To: FOT Triumph <[email-masked]>
Subject: Re: [Fot] TR4 head milling

=20

Some years back Kas came over.  We studied heads.  I cut a stock head on =
a band saw at different places. Kinda looked at it deeply.  I mentioned =
that the only best way to get 14.5: 1 CR is to make the combustion =
chamber small and keep the thickness of the head stock. Utilizing flat =
top pistons.  ( he did not like pop ups). =20

Easy to do once you weld up the combustion chamber and mill the chamber =
to a known volume. While at it make the intake runner better and sized =
right.  Need custom length longer valves too.=20

Made three of these alum heads.  Alas the first one was unfortunately =
expendable - found out limits what we could grind.

Oh=E2=80=A6 they are seriously light.=20

Good stuff. =20

=20

Sent from the all new AOL app for iOS =
<https://apps.apple.com/us/app/aol-news-email-weather-video/id646100661> =

=20

On Saturday, April 6, 2024, 7:30 PM, GREGORY THOMPSON via Fot =

Has anyone had an issue with breaking into a water jacket on the TR4A =
head with taking off .150?

=20

Thank you,

=20

Greg Thompson=20

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/[email-masked]

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Yep, been there, done that. Combustion =
chambers too. Put a lot of weld in the exhaust valve pockets. It is not =
fun hand grinding cast iron but it was worth it, moths later. The thing =
really flows though. Added a bunch of aluminum to the intake and removed =
just as much. I never got it to flow as well as the head so went with =
dual DCOE=E2=80=99s. I did minimal milling and use pop up pistons to get =
my compression. 13.2:1.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Jim g<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Fot &lt;[email-masked]&gt; <b>On Behalf Of </b>Mordy Dunst =
via Fot<br><b>Sent:</b> Sunday, April 7, 2024 1:26 PM<br><b>To:</b> FOT =
Triumph &lt;[email-masked]&gt;<br><b>Subject:</b> Re: [Fot] TR4 head =
milling<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Some years =
back Kas came over. &nbsp;We studied heads. &nbsp;I cut a stock head on =
a band saw at different places. Kinda looked at it deeply. &nbsp;I =
mentioned that the only best way to get 14.5: 1 CR is to make the =
combustion chamber small and keep the thickness of the head stock. =
Utilizing flat top pistons. &nbsp;( he did not like pop =
ups).&nbsp;&nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal>Easy to do once you weld up the combustion chamber and =
mill the chamber to a known volume. While at it make the intake runner =
better and sized right. &nbsp;Need custom length&nbsp;longer&nbsp;valves =
too.&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal>Made three of these&nbsp;alum&nbsp;heads. &nbsp;Alas =
the first one was unfortunately expendable - found out limits&nbsp;what =
we could grind.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal>Oh=E2=80=A6 they are seriously =
light.&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p =
class=3DMsoNormal>Good stuff. &nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal><a =
href=3D"https://apps.apple.com/us/app/aol-news-email-weather-video/id6461=
00661">Sent from the all new AOL app for iOS</a><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3Dyahoo-quoted-begin =
style=3D'margin-top:0in'><span =
style=3D'font-size:11.5pt;color:#715FFA'>On Saturday, April 6, 2024, =
7:30 PM, GREGORY THOMPSON via Fot &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:<o:p></o:p></span></p><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
id=3Dyiv3762339536><div><p class=3DMsoNormal>Has anyone had an issue =
with breaking into a water jacket on the TR4A head with taking off =
.150?<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Helvetica",sans-serif'>Thank =
you,<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica",sans-serif'><o:p>&nbsp;</o:p></span></p>=
</div><div><p class=3DMsoNormal><span =
style=3D'font-family:"Helvetica",sans-serif'>Greg =
Thompson&nbsp;<o:p></o:p></span></p></div></div></div></div></div></div><=
p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>__________________________________________=
_____<br><a =
href=3D"mailto:[email-masked]">[email-masked]</a><br><br><a =
href=3D"http://www.fot-racing.com" =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
href=3D"http://www.team.net/donate.html" =
target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <a =
href=3D"http://autox.team.net/archive" =
target=3D"_blank">http://autox.team.net/archive</a> <a =
href=3D"http://www.team.net/pipermail/fot" =
target=3D"_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Ma=
nage: <a =
href=3D"http://autox.team.net/mailman/options/fot/[email-masked]" =
target=3D"_blank">http://autox.team.net/mailman/options/fot/gasket.works@=
gte.net</a><br><br><o:p></o:p></p></blockquote></div></div></body></html>
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