Compression ratio and displacement

Originally Posted by phunk To add .5mm thicker headgasket would be like 3-4cc extra chamber volume. (616 + 65) / 65 = 10.47 So that is a pretty significant reduction

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Compression ratio and displacement

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12-25-2014, 12:33 AM

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Quote:

Originally Posted by phunk

To add .5mm thicker headgasket would be like 3-4cc extra chamber volume.

(616 + 65) / 65 = 10.47

So that is a pretty significant reduction in compression ratio.

Yep -- an old tuner "band aid" trick, but it doesn't work very well...

For one thing, you have the wrong head gasket, so that can lead to leaks. For another, reducing compression without changing the pistons doesn't give you stouter parts or even necessarily reduce the likelihood of detonation (i.e., propensity for hot spots along the piston crown remain unchanged).

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