[TR] Compression

DAVID MASSEY dave1massey at cs.com
Mon Oct 15 11:14:47 MDT 2018

 It's all in the head.  The combustion chambers in the later head are larger.  Since compression ratio is (Displacement + Combustion Chamber Volume)/Combustion 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 Chamber Volume and increase the CR.  It is a fairly common practice among folks who modify their cars for performance.


Dave Massey



-----Original Message-----
From: Carl Carlson <actionsl at att.net>
To: triumphs <triumphs at autox.team.net>
Sent: Mon, Oct 15, 2018 11:57 am
Subject: [TR] Compression

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** triumphs at autox.team.net **Donate: http://www.team.net/donate.htmlArchive: http://www.team.net/pipermail/triumphs  http://www.team.net/archiveUnsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/dave1massey@cs.com
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