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swb85 · 03-16-2009, 02:03 PM

I think I see what you're doing. You stated above that your pistons have a 36cc dome. In the calculator you listed, you need to use -36 for a piston volume instead of 36 (which would be a 36cc dish).

Your deck height is a crucial measurement in figuring compression ratio. Stock deck height is ~.025" below deck. The difference between stock and zero deck is over a half point of compression.

03-16-2009, 02:03 PM	#5
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Calculating Comp. ratio?? I think I see what you're doing. You stated above that your pistons have a 36cc dome. In the calculator you listed, you need to use -36 for a piston volume instead of 36 (which would be a 36cc dish). Your deck height is a crucial measurement in figuring compression ratio. Stock deck height is ~.025" below deck. The difference between stock and zero deck is over a half point of compression. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD Last edited by swb85; 03-16-2009 at 02:26 PM.