some time ago on sale. Summit racing has them in their catalog. It work=
s
exactly as you described and really doesn't cost that much considering ho=
w
much an inaccurate diagnosis can cost. Basically the tester measures
cylinder air leakage regardless as to whether it goes by the rings, head
gasket, valves etc. =
Dave
Message text written by Rob Root
>The airplane mechanics have a much better way to test compression, using=
a "differential" testor. They apply a known pressure (80 psi
typ.)through the sparkplug hole on compression stroke, and see how much
the cylinder will retain, for example 76/80. Also makes diagnosis of
problems easier. Hiss heard in the carburator is intake valve, hiss in
the exhaust pipe is exhaust valve, and hiss in the oil filler tube is
rings...<
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