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Compression readings? 444-544

posted by  Phil S. on  Sat Nov 22 04:59 CST 2003
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

I didn't download the calculator whatzis, but my belief is that there's no way to calculate CR from compression test readings. They're good for comparing one cylinder to another, but there are way to many variables involved to be able to state that 180 psi = 10:1, or anything of that sort. Cranking speed? Cam overlap? Valve lash? Air temp? Etc.

You're right on with the squish/quench being less than ideal in stock motors... tighten it way up, and combustion efficiency improves dramatically. Such "quick burners" need much less ignition advance and you can run fairly high CRs on 92-octane without any pinging at all.






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