Chris Gentry wrote:

I am starting to plumb the oil to and from the T04 turbo.  The turbo oil outlet is
below the normal return hole of the engine case. The turbo drain hole is about 1
inch above the full oil level.  Please comment on the following options I may
choose to get adequate drainage:
1) Use a fuel pump to scavenge to the original turbo oil return hole in the case.
Which fuel pump?

Good question Chris. Maybe Chuck can answer. As I recall he is using fuel
pump to scavenge the turbo oil. Chuck?

2) Fabricate a drain barb into the top (near the pan bolts) of the oil pan.  This
may mean I would have to keep the oil level slightly lower than full. With this
option should I run a 1/2 quart low or extend (horizontally) the oil pan capacity
or add another small  oil cooler and always run 1/2 quart low.  (I'm using the
stock RX-7 oil cooler.)

Does not sound like a very good plan.

3) A better idea that you might suggest.

Related question:  The normal oil source for the stock turbo appears to have gone
through the engine and then goes to the turbo which means it is already very hot
oil.  My T04 is not water cooled so I would rather lubricate the turbo with cooler
oil.  Any suggestions on how I could safely do this?

Regards, Chris Gentry
                Glasair Turbo Rotary
                 Dragonfly Turbo Subaru
                  Grumman Cheetah

A "T" in the oil return line from the oil cooler? Are you using a
metric to AN adapter where the oil cooler line goes into the block?
See picture with red arrow. Banjo fitting shown.

Paul Lamar
 
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