Since Mazda is thinking of running the engine up side
down in the new car soon to be introduced I was thinking
of the best rotation for use in an aircraft.

That has to be with the exhaust port pointing down.
That gets the exhaust heat out of the cowl as soon
as possible. The problem with the stock center housing
is rotor cooling oil drain back in that orientation. In early days
I fought against it for that reason.

Also an off the shelf dual throat Webber 52 mm down draft carb
can be used with a p-port in a very simple manor. That allows
moving the engine up 2 inches.  More on this shortly.

Here is a cut away center housing showing the cooling
oil drain backs from the rotors. That is the main factor
the orientation of the engine.

If we are building our own aluminium center housing
that should be the way to go. No oil pan is necessary
just an after market dry sump pump system. One
AN line from the bottom of the center housing can
scavenge all rotor cooling oil.

An AN dash 16 is shown in the TTC engine oil plumbing but
a dash 8 would be plenty big enough for 250 HP.

All that breather and oil filler part can be done away with
in the center housing. Greatly simplifying it.

Paul Lamar

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