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


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