[Healeys] 4 Cyl Compression Measurement

Greg Lemon glemon at neb.rr.com
Tue Dec 1 16:56:21 MST 2009


For what it is worth when I rebuilt my 100 engine with .060" over 8.5/1 
pistons and Le Mans cam I got readings in the neighborhood of 165-170 psi 
across the four.

At 8.0/1 I would assume you owuld be slightly lower but in the ballpark, I 
would think maybe in the 145-160 psi range with little variation from 
cylinder to cylinder (I forget what is considered acceptable 2-3%, or maybe 
5 psi or so on a rebuilt motor?) would be in the ballpark.

Greg Lemon


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