My experience with STC'd add on turbo kits for TC type engines is that they
almost all use a scavenge pump bolted on the accessory case or between the
case and vac pump. They suck the oil up from the turbo and throw it in the
pan.
And those pumps/adaptors are expensive and fallible. One member I know 2
weeks ago had his Rajay turbo'd Cardinal spit all the oil out at 16,000'
cause the scavenge pump quit. He glided to a safe landing. (Says a lot about
high altitude cruise). His engine, which was 2 weeks old from a rebuild
(because his nose gear wouldn't come down!) is now again trash. Wonder what
his insurance company thinks.
He runs the Cardinal list. So much for certified aircraft. Maybe we can do
better. Let gravity drain that turbo. Put em high.
Marc

Bill Freeman wrote:

I will weigh in with Marc on this one.  A pump is a critical failure item,
and an unusual
one at that.  Make a real serious effort to let the turbo gravity drain.  I
think a scavenge pump is a seriously bad design concept.

Bill

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