Quote:
Originally Posted by ah-kay
It is a trick to check for consistency ONLY. It does not tell you much. It does not tell you which cylinder unless you rotate the engine to compress at a pre-defined cyl, say #1. It does not tell you compression numbers, if low, how low or how high? The equipment is expensive. The low compression could be due to valve adjustment so there are still a lot of unknowns. Just fire up the engine and do the simple checks.
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If the engine starts within a quarter rev of the starter and not having to crank it for 30 sec, you can assume it has good compression.
If the test can accurately discern uneven compression in cylinders, that is a goldmine of information for a in the field non invasive test that is quick and easy. It would determine for me a buy or no buy.