It is actually very possible to calculate your effective compression.
This is usually based on the intake valve closing point, stroke, bore, and rod length.
I have a program written by my friend, GTO Karl, that calculates this very acurately.
If your good at math, this would be very easy to do. The calculation simply figures compression ratio with the volume of cylinder at the point where the intake valve closes.
For this you would need to calculate, or plot linear piston travel and find at what height the piston is in the bore at IVC.
[img]http://groups.msn.com/_Secure/0PAAAABsTshS*JL3aL9Lt3DTWpiaZQYuTwADv04vUiCSGPh1UW kUzJcyoBHF!u5vkOCDRCP1bN46o1zkzqk3S2WcjuGbw2xV8/Black-65-2-1.JPG[/img]
[This message was edited by Black 65 GTO on December 18, 2002 at 07:01 PM.]
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