Re: Cylinder Compression Questions

Posted by PackardV8 On 2014/11/14 22:41:59

1. If an INTAKE valve (JUST ONE) is hanging open ever so slightly it will keep ALL EIGHT cylinders from drawing enuf fuel/airr mixture to run the engine at all. NOT necessarily true if only one or 2 EXhaust valves are open.
2. When running a compression test SQUIRT OIL into cylinders otherwise compression reading will be low by at least 20 psi.
3. One can test for stuck valves by blowing smoke thru the spark plug holes when each cylinder is on power stroke. Can also use compressed air at about 20 to 30 psi and listen close to exhaust pipe and carb.
4. To make a compression tester adapter for 10mm use a 10mm spark plug. Knocke the guts out of it and tap it for 14mm. I'll have to look at my adaapter i made from from a spark 10mm sparkk plug to verify the tap size and plumbing but it is rather simple.