Paul,

I was at Aero Expo and found three Wankel makers there.  When I look
 at the P port it seems that there is a chance for the gas

to pass from one side of the apex to the other side right at the p
port.  Is this an issue?  I guess not as people would have thought of
  this long time ago.

Gordon GAO


Not a problem over 4500 RPM. Usually the pressure in the intake is
higher than the pressure in the exhaust.

It is like a jet engine in that regard. The air pressure from the
compressor section is higher than the pressure from the combustion
area so air flows in the front and out the back.

Paul Lamar


 I'd say the doubt is about an actual problem, when a P-Ported
RCE is under part/low load, the burned gas may flow back the
intake port, because of the port overlap, it's described in the
Kenichi Yamamoto books and other publications, eg, the low-load
work by Toyota, exhaust gas can jump even up to the carburetor
in carb engines, this reduces volumetric efficiency, Mean
Effective Pressure, dilutes charge, and can be in the origin of
misfires, but EGR, for reducing flame temperature, has always
been a way to reduce the NOx emissions; to reduce the HC
emissions, you need a hot rotor and/or hot housing surface.
Lubricating oil film fades away above 130º C (266º F) working
surface temperatures.

 The PP arrangement is also worse regarding idle in cars, but
this is an aviation site.  I attach the K Y and other charts on
PP vs SP, to compare efficiency, also the square vs round PPort.



  Thanks, regards. Salut †
   Jose Gros-Aymerich
   E-28033 Madrid, Spain



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