Hi Paul and Gang,

I have decided to install an oil scavenge system to return the oil from
Tracy's gear box and perhaps from my turbo as well.  I am really getting
tired of all the oil getting all over everything.  It clearly seems to be
coming from the area between the RD1B and engine, which means that it is
probably coming past the RD1B oil seal.  Tracy call for a nice big line and
downhill only run of the oil to a point that is higher than the oil level
in the sump.  However, there is precious little elevation drop and I have
not been able to achieve those requirements with a gravity only system.  If
I run the oil level very low in the sump the problem is improved, but I
think it is time for a better solution.

I am considering either a custom oil pan that allows for a deeper drop of
the oil, or a scavenge pump.

The benefit of the custom oil pan is that it can be an improvement in
weight over the stock pan, and requires no moving parts or power and is
unlikely to fail.  The scavenge pump is nice because it would be an easier
installation and will probably be more effective at fixing my solution,
though I do worry about adding another possible failure point.

1) Soliciting pinions on the decision between Scavenge pump and custom oil
pan.

2) Recommendations on someone who makes custom oil pans and pickups?

3) If I choose a pump, does that solution require a tank or can the drain
lines be connected directly to the pump?  This would create a suction on
the outlets of the RD1B and or the Turbo, does anyone see a problem with
that?  Drain oil from the RD1B too fast?  Bad for turbo bearings?

4) Would I need 2 pumps for redundancy?  I am leaning that way, which means
I am leaning more toward custom oil pan.

5) Turbo drain back seem adequate, which means I could use the pump to
isolate the Gear Box oil, allowing for different oil there.  Thoughts on
this option?

Thanks for the input!

Dave Leonard
Turbo Rotary RV-6 N4VY


Multi section oil scavenge pumps are off the shelf.

The time to climb engine has no oil pan.
It can be replaced by a flat plate.
 
The drainback areas are handled directly. The front main bearing,
the cooling oil drain back from the rotors, the rear main
bearing and the turbo.

In addition the internal oil pressure pump is done away with
and replaced by one more external pump.

Here are some pictures.


This trick gives more room for cooling systems under the engine.

More on this later when my new plastic (RTV) eyes start working
better :-)

Paul Lamar

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