Subject: Re: [TR] Compression

From: DAVID MASSEY <[email-masked]>
Date: Mon, 15 Oct 2018 13:14:47 -0400

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 It's all in the head.  The combustion chambers in the later head are large=
r.  Since compression ratio is (Displacement + Combustion Chamber Volume)/C=
ombustion Chamber Volume a larger Combustion Chamber Volume will give you a=
 smaller number.

You can take a later model head and shave it down reducing the Combustion C=
hamber Volume and increase the CR.  It is a fairly common practice among fo=
lks who modify their cars for performance.

=20

Dave Massey

=20

=20

-----Original Message-----
From: Carl Carlson <[email-masked]>
To: triumphs <[email-masked]>
Sent: Mon, Oct 15, 2018 11:57 am
Subject: [TR] Compression

Can anyone tell me where the TR250 & early TR6 engine gets it=E2=80=99s hig=
h compression as the bore & stroke is the same as the latter engine?Carl** =
[email-masked] **Donate: http://www.team.net/donate.htmlArchive: h=
ttp://www.team.net/pipermail/triumphs  http://www.team.net/archiveUnsubscri=
be/Manage: http://autox.team.net/mailman/options/triumphs/[email-masked]=
m

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<font color=3D'black' size=3D'3' face=3D'Arial, Helvetica, sans-serif'>
<div> <font size=3D"3">It's all in the head.&nbsp; The combustion chambers =
in the later head are larger.&nbsp; Since compression ratio is (Displacemen=
t + Combustion Chamber Volume)/</font><font size=3D"3">Combustion Chamber V=
olume a larger </font><font size=3D"3"><font size=3D"3">Combustion Chamber =
Volume will give you a smaller number.</font></font></div>

<div><font size=3D"3"><font size=3D"3"><br>
</font></font></div>

<div><font size=3D"3"><font size=3D"3">You can take a later model head and =
shave it down reducing the </font></font><font size=3D"3"><font size=3D"3">=
<font size=3D"3">Combustion Chamber Volume and increase the CR.&nbsp; It is=
 a fairly common practice among folks who modify their cars for performance=
.<br>
</font></font></font></div>

<div> <br>
</div>

<div style=3D"clear:both"><font size=3D"4">Dave Massey</font><br>
<br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Carl Carlson &lt;[email-masked]&gt;<br>
To: triumphs &lt;[email-masked]&gt;<br>
Sent: Mon, Oct 15, 2018 11:57 am<br>
Subject: [TR] Compression<br>
<br>
Can anyone tell me where the TR250 &amp; early TR6 engine gets it=E2=80=99s=
 high compression as the bore &amp; stroke is the same as the latter engine=
?

Carl
** <a removedlink__619ff96f-797a-4a9e-bcd3-821a73929c95__href=3D"mailto:tri=
[email-masked]">[email-masked]</a> **

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Archive: <a removedlink__619ff96f-797a-4a9e-bcd3-821a73929c95__href=3D"http=
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ipermail/triumphs</a>  <a removedlink__619ff96f-797a-4a9e-bcd3-821a73929c95=
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</font>
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From: Paul Tegler <[email-masked]>
Date: Mon, 15 Oct 2018 15:54:10 -0400

.... cylinder head volume  changes the comp.

ptegler

On 10/15/2018 11:09 AM, Carl Carlson wrote:
> Can anyone tell me where the TR250 & early TR6 engine gets it’s high compression as the bore & stroke is the same as the latter engine?
>
> Carl
> Donate: http://www.team.net/donate.html
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-- 
Paul Tegler
[email-masked]  www.teglerizer.com

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From: Mark J Bradakis <[email-masked]>
Date: Mon, 15 Oct 2018 15:58:54 -0600

> Can anyone tell me where the TR250 & early TR6 engine gets it’s high compression as the bore & stroke is the same as the latter engine?
Application       CR    Thickness   CC depth   CC volume

GT6 Mk I        9.50
GT6+            9.25     3.450     0.425       34
GT6 Mk III      9.25     3.32       .47        37
(early)
GT6 Mk III      8.0      3.40       .55        44
(late)
TR250, TR6      8.5      3.55       .60        48.5
TR6 middle      7.75     3.54       .68        55
TR6 late        7.5      3.55       .70        57
TR6 race 1     10.25     3.375      .52        41.6
TR6 race 2     12.3      3.295      .44        33
GT6 race 1     10.75     3.31       .385       30
GT6 race 2     12.75     3.22       .300       24.4