>Yes Graham Gemin you got it right in volts n' amps. What I do not really
>understand is why we need one method of testing engines that normally fly
>thru the air and another for engines that only fly thru the air after they
>hit the crash barriers.stop I think I've got it
>Mayhap that we lost too many fitters tangled in the prop whilst doing a car
>type comppression test on a 1000 hp radial. Anyone out there know a serious
>technical reason for the difference. I have used a "car type" on a two
>stroke flying machine engine and got sensible answers so I was going to do
>the same with my four stoke rotax unless someone can tell me why I sholdn't
>
The reason is that car type compression testers are affected by such
variables as cranking speed, cam timing overlap, and compression ratio:
differential compression testers only measure the "leaks" in the system.
Miles
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