I think Jeff (jeff.doddridge@gmail.com) cut these down for Mazdatrix.
 It does away with the round oil seals which I suspect we don't need.
 The oil seals have unavoidable friction which in theory burns slightly more
 fuel.

 My guess, based on these enclosed charts, is a 33% reduction in rotary
 engine friction. The engine will generate more power at the same RPM as well.

 Furthermore the side seals will get more oil for possibly lower side housing
 wear.

 It also cuts the weight of rotors so the counter weights are slightly
 lighter and the load on the rotor bearings is reduced at any given RPM.

 My Mazda Cosmo had melted oil seal O-rings and I drove it for years.
 It smoked like a radial engine when you started it up but then it stopped
 after a few seconds. I never noticed higher oil consumption.

 Mazda mentioned this when they were talking about the first rotary engine they
 built. It ran fine but they had to add the oil seals to solve the start up smoke
 problem.

 I think they will work fine in a p-port aircraft or racing car engine.

 Sorry about the cell phone pictures. I forget my good camera when I visited
 Mazdatrix.

 Paul Lamar

 Paul,
 Best idea I have seen in a while. as long as the side seal gaps are done
 very well, this should work fine. I once worked a an engine that a school
 had rebuilt and the oil seals were installed upside down. Smoked like a navy
 smoke layer.... but the side seal gaps were big as well. I like the increase
 in corner seal oiling.... I think I might have to build one of these to
 try....
 Larry

 Great minds.........:)

 Paul Lamar

 Paul,
 for anyone doing this, make sure you radius off all the sharp corners left
 by the end mill...... unless you like cracks
 Larry

 I just had another idea. The amount of oil retained in the rotor after the engine
 stops depends of the size of the large oil drain back oil in the center housing. This
 oil will leak down and get to the bottom of the engine to create smoke on start.
 Making the large drain back hole even larger will reduce the quantity. It will also
 cut a bit of weight out of the center housing.

 Another possibility is a tiny .032" dia. drain hole drilled in the bottom of the
 rotor housings letting the accumulated oil slowly drain back to the oil pan.

 This may eliminate the smoke on start up.

 Paul Lamar
 --

I hope Richard Sohn and any other single-rotor developers are seeing this.  A
reduction in rotor weight pays off doubly for them due to the concomitant reduction
in counterbalance weight.  Also, of course, the main thing is that reducing the mass
of the rotor increases the "minimum bearing load" RPM a bit, which improves HP for a
given weight (if the PSRU can allow us to use it).

Of course, it all depends on being able to do this without too much trouble/expense,
and the modification needs to prove itself to be as durable as the original rotor has
proven to be.

Richard, how about a progress report (new thread)?

Mark W.
		 	   		

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