Technical > Matt Shaff's Engine Shop

Compression Ratio

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spitzerscott:
If a set of pistons is advertised at 12.5cr with 64cc chambers, and I have 58cc chambers what would I end up with for cr? I know there is a formula but I'm trying to do it the lazy way.   Thanks

noslin:
http://www.gtsparkplugs.com/CompRatioCalc.html

try that maybe. 

msundstrom:
The FIE web site also, Spud has a very user friendly Compression calculator. Think it bumps it a little over 1 point @ 58cc.
Mark

spitzerscott:
The reason why I am asking is, without taking the engine apart I cannot fill in all the blanks. But I was told to add about 1 point. Just thought someone could confirm.   Thanks

wideopen231:
actual bore and stroke number will change outcome of clculatios. A bigger engines number will be totally different  than smallier engine. Larger engine  easier to build compression in.

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