Mark,
Thanks for the information. Hey, at least the fact that the engine
carries the wrong head offers one explanation of why we could never get
the darn thing to run right and why it produced no power. Using your
figures and the formula Ted S. gave me this morning, my engine was
running a CR of 6.2:1.
Scott
> -----Original Message-----
> From: Mark J Bradakis [SMTP:mjb@cs.utah.edu]
> Sent: Wednesday, February 24, 1999 12:15 PM
> To: jbarr@doorpi.net
> Cc: fot@autox.team.net; sbarr@mccarty-law.com
> Subject: Re: 1972 GT6 Head
>
>
> >From the info I have in my chart, it may be that the head on the GT6,
> being 3.550", is possibly a TR6 head and not the original GT6 unit.
> My vote is yes, you can mill the head that far to get the numbers you
> want, though getting some domed pistons may be the way to go.
>
>
> 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
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