Douglas Fir wrote:

Dear Paul

 I am wondering about the wisdom of running the same oil through the engine
as well as the PSRU. It seems it would be wise to have a separate oiling
system and cooler for the PSRU. Aren't  oil gear pumps designed to work best
in a certain range of head as well as flow?  All additional elbows and hose
length really add up to increase 'head' and decrease flow.

The oil pump has to more robust to handle the higher heat output in
sustained high RPM for an aircraft engine. In addition it has the job of
oiling the "metal shaver" as well.

Restrictions in the intake often causes cavitation. At least it does in
water pumps applications. The PSRU It is basically a high speed planetary
gear box modified from some Ford trans-axle parts correct?  It runs hots
like in a  truck pulling a horse trailer across the desert up the mountain
roads.  Lets assume the service factor would be higher in the plane. Would
it be crazy to think that air fins on the aluminum cast housing would be
adequate to cool it? Or would heat wick into the engine behind it?

Doug in Japan

Aren't we all. It is done in the interest of simplicity but it should be
separate gear oil, filtered  and cooled.

Paul Lamar
 
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