Thread: Zero compression in one cylinder

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Sparky; I'm not following your suggestion.. Are you saying just hook a compressed air line to that cylinder and run 80PSI into that cylinder with the rockers backed off. If it is a valve problem you'd have air blowing out the exhaust. If it's a hole in the piston air out of the oil galley?

Originally Posted by kcress

Sparky; I'm not following your suggestion.. Are you saying just hook a compressed air line to that cylinder and run 80PSI into that cylinder with the rockers backed off. If it is a valve problem you'd have air blowing out the exhaust. If it's a hole in the piston air out of the oil galley?

Yup, yup. And if it's an intake valve (doubtful, cause it'd REALLY run like crap) it'll blow up the intake.