<<This is a standard differential compression test: set 80 psi on the first
(helps to have a regulator) and the second gives you an indication of leaks
in the system at TDC: rule of thumb is that 60/80 is minimum -although some
engines (big continentals ) regularly show as little as 45/80 and are OK.
Healthy engines are in the 70+/80 bracket.>>
Sorry Miles, I am not with it yet. We simple electronic engineers need a
"circuit diagram" ! How are the "first" ,"second", and the orifice wired up ?
Graham C.
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