The T3 turbos on the Eagle540 are fed by -4 lines. The outlets are 3/4" pipes into defoaming cans, which are pumped out through -6 lines by a scavenge pump. We've been experiencing some leakage into the turbine section after shutdown and even sent one of the turbos back to Kelly Aerospace (ie, Turbonetics) for inspection to see about curing the problem.  They inspected, declared the turbo perfect, verified our plumbing to be adequate and told us that we can expect some oil past the seals until we build some run time at power to cause the seals to coke up a bit.  Those seals are nothing more than piston rings, and they seal adequately when hot & expanded, but inadequately after shutdown. We hope they're correct.  At any rate, extraction of oil from the outfeed of the turbo bearing housing is critical, thus the large outlet.  Due to the high RPM of the turbo there is considerable foaming, so extraction is apparently the key.

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