Ernesto Sanchez wrote:

Moroso has oil scavenge pumps.  Maybe something like that would work.
Ernesto

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

tommayer wrote:

Paul, Chris,
    I went through this when I blew my Lycoming.`
    If you can possibly arrange to do so, mount the turbo high and drain

the

oil back into the case via gravity.
    Make sure the oil from the turbo enters the pan ABOVE the oil level

in

the sump.
    The turbo oil will be frothy, so it is a good idea to use big tubes

or

hoses and perhaps make small tank for it to settle down in on the return
journey.
    I found the best aircraft set up to copy for simplicity is the

Navajo

Chieftan, in terms of turbo placement and turbo oil return.  Aircraft
scavenge pumps are almost the most expensive part of the system, and I

would

be scared to fool around with an unproven pump in this usage.

    On the Lycoming I took oil from where the filter usually goes and

sent

it to the turbo.  No problem with too hot oil.  Maybe the rotary is so

hot

you should do it differently.
 Use lots of slip joints in the exhaust or you will get cracks.
Tom Mayer

Ernesto Sanchez wrote:

Moroso has oil scavenge pumps.  Maybe something like that would work.
Ernesto

Yes they do. Expensive. Here are some on Racing Beats 900 HP turbo three
rotor. Note the over size water pump above the black scavenge pumps. 

Paul Lamar
 
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