Compression ratio from compression test?
Hi All,
I know it's not an exact science but I was wondering if there was a formula that gets you in the ballpark? I figure with a known cylinder volume and a compression reading one should be able to get in the ballpark with a compression test reading.
I have heard that an 18:1 engine has a compression test reading of about 350 psi. No matter how I slice it I can't seem to come up with a formula that comes close to 18:1. Again, I know it's not an exact science as you really need to take into consideration head gasket thickness, head volume, etc but a simple compression test should be able to get you close I think? Any one know of a ball bark formula?
Art.
Art Paltz
1999 Suburban K2500 6.5TD (stock)
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1992 Tube Chassis Camaro, 468 BBC, 8.54@157MPH (SOLD)
1987 Buick Grand National, 11.8@114, pump gas (for sale)
1969 Camaro SS/RS 396-350HP, stock restoration, it never leaves the garage...