Hi All,

Normally compression testing is done while cranking. Is there a guide as to what percentage you would get turning over an engine by hand?

Thanks,
Steve

Probably not enough to measure - if you can turn it by hand .

Aren't they normally with the engine hot too???

Only test you can if you can't crank the engines is a cylinder leakdown test -- really good thing to do on high performance engine to monitor the engines condition.

Leak down tester cost about 60 pounds upward but it is easy to make your own