>" Checking by the commonly used pressure difference method: Place orifice of
>1mm dia and 3mm length between the two pressure gauges... max pressure drop
>25%"
>
>from Rotax 912UL operators manual.
>
>What two pressure gauges ? Anyone know what this means ?
>An Austrian perhaps?
>
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.
Miles
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