Doug,
Check out Goodparts' compression tech page:
http://goodparts.com/tech_docs/TR6_Compression_Ratio.html
According to this chart, a compressed head gasket is about 4cc in volume.
If you were to shave that much additional off to compensate you're looking
at about 9.65:1 (.090+.035), so the gasket adds about 0.65 to the CR. At a
lower compression it works out to about 0.50, at a higher CR it becomes an
additional 0.75. This is assuming you have a late TR6 with 7.75:1 stock CR,
the head was checked before the machine work and you are using standard bore
pistons.
Greg Dito
CD6250L
----- Original Message -----
From: "Douglas Morris" <dcmdcm@earthlink.net>
To: "6pack" <6pack@autox.team.net>
Sent: Monday, January 05, 2004 5:58 PM
Subject: Compression Ratio Test
> During the overhaul, I had the stock head shaved about .090" to get it
> closer to a 9:1 compression ratio. Now I'm curious, is there any way to
find
> out what the as-shaved & as-gasketed compression ratio actually is?
>
> Doug Morris '74 TR6 CF18K/UO, NC
> (hopefully without my recent address-book screw-ups)
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