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Old 09-04-2013, 06:27 AM
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The type pistons used are not the only determining factor in your final CR.Chamber volume,headgasket thickness/bore, piston to deck hgt. all play a role in your final CR.It's important to know how far your pistons are down the cylinder to determine the parts used to complete the build.If pistons with a shorter pin hgt were used,(1.540" vs 1.560"),your pistons could already be up to .045" plus the thickness of the head gasket used.Optimum quench,(the distance between head deck & piston top is .039 to .045.If your pistons are already .045 down w/o the gasket,you will want to keep CR relatively mild to avoid detonation.Proper quench helps to deter detonation & provides a more complete & efficient burn.
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