this guys site has a link to a compression ratio calculator program if you
want to give it a shot.
http://home.iprimus.com.au/tridim/triumph/Engine.htm
----- Original Message -----
From: "Peter Macholdt" <vze2846b@verizon.net>
To: "6pack list" <6pack@autox.team.net>
Sent: Saturday, November 23, 2002 7:49 AM
Subject: Re: Compression and head shaving
> You can get an estimate, not an exact figure by measuring the head
> thickness. Get a micrometer or a good set of calipers. Measure the
thickness
> between the head/ block mating surface and the surface where the valve
cover
> mounts.
>
> A thickness of 3.460" equates to a CR of about 8.5. A thickness of 3.375"
> equates to a CR of about 10.25. On the other end of the scale, some of the
> newer heads go up to 3.550" thick and I guess these would be the 7.5 CR
> heads.
>
> FIW, I tried to use the Kas manual to create a linear progression of head
> thickness to CR. I couldn't get the far ends of the scale to work. This
> would be a neat item to have, if someone more adept than I were to
succeed.
>
> Peter
> '68 TR250
>
>
>
> on 11/23/02 10:24 AM, Richard Seaton at rsh17@msn.com wrote:
>
> > I have a 1969 TR6 which had the head shaved when rebuilt ,but I don't
know how
> > much was taken off 15 years ago. Is there a way to measure the thickness
of
> > the head and to come up with some sort of compression figures?
> >
> >
> > TIA
> >
> > Richard Seaton
> > RSH17@msn.com
> > View My restoration @ (http://groups.msn.com/Richards69TR6Restoration)
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