ORIGINAL: rexbirk
As long as we are on a discussion about compression why do the Chinese Engines have so little while my 3W Engines have so much when cranked by hand?
China made engines lack precise fitted parts.Sometimes too large of a ring end-gap. Cylinders can be out of round ...rings cannot seal good. Cylinders can have a taper...again rings cannot seal good. Ring material can be to hard...rings do not seat good. Ring could lack good machining...poor fit.