It occurred to me if you pump enough oil into the rotor roller
   bearing it will cool it. Normally a roller bearing requires very
   little oil and that is why they are used in charge cooled engines.
   The trouble is there is not enough oil flow to cool it at high power
   levels mixing small amounts of oil with the fuel.

   The engine will also need a scavenge pump to get the hot oil out and
   through a oil cooler and back into an oil tank.

   On the OMC all that is needed is one small hole in the back side of
   the eccentric lobe to feed high pressure cooling oil into the rotor
   roller bearing. High pressure cooling oil is fed into the eccentric
   shaft from one end or the other.

   There will also be a hole in the case just beyond one or both of the
   main bearings to suck the excess cooling oil back out. Some the of
   the fuel mixture will be sucked out as well but the fuel will go to
   the bottom of the oil tank and can be recovered.

   If the intake plumbing is changed so no mixture goes into the main
   bearings and through the rotor then no fuel will be sucked out with
   the cooling oil. In other words just a simple p-port is all that is
   required. In fact there will then be no mixture in the center of the
   engine at all.

   Here is a scavenge pump on ebay for $219. One section can be used as
   the pressure pump.

   This is A MAJOR DEVELOPMENT for charge cooled engine including the
   AIXRO if it works.


   Paul Lamar



   Paul, and Group, Roller,  needle, and ball bearings have a
   requirement for light lubrication. Rollers especially. If over
   lubricated the rollers can hydroplane, or skip. The problem is when
   they touch back down. Think of a plane landing and how the tires
   often chirp as they match speed. The same thing can happen to a
   roller bearing with catastrophic results. The steel can weld together
   or chip causing bearing failure

   Bill Jepson.

How does load and clearance factor in?

The load on the rotor roller  bearing is quite complex due to centrifugal force on the rollers varying as they make their way around the center of the e-shaft.

It's a wonder they work at all.  I think it is still worth a try.

Paul Lamar


Hi Paul,
     How much was that guy wanting for one of those snowmobile rotary engines, do you know ?
     Cheers Chris.

I forgot but he is on here so he will let us know.

Paul Lamar

Paul,
Put an oil spray nozzle in the shaft to cool the rotor and a tiny hole in the bearing inner shell for positive lube. Question is if you will need any side oil seals on the rotor to keep it from making more smoke than a navy mine layer.....
Larry C

Just tell people it is an air show airplane and the smoke is on purpose :-)

The side seals were shot on my Cosmo. Smoked like a smelter
chimney when you started it up but it went away after it ran
for a few minutes. I drove it like that for ten
years. Had 300,000 miles on it when I sold it.
Cosmo

Paul Lamar

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