This is Jim in Austin.  The new guy.  What is a "P" port.  Versus what other
kind of port?  Why would one want a "P" port?  Can I look this up on the
informative rotaryeng.net website?

Jim Beckman.
Austin

A P-port is a 2 inch diameter hole in the side of the rotor
housing. As such it breathes much, much better than the stock
side ports. A P-port 13B is easily capable of 300 HP while
the vast majority of side port engines are around 200 HP.
3 out of the seven rotary powered aircraft at OSH this year were
P-port engines.

See http://www.rotaryeng.net/intake.html

Click on the underlined topic lines.
Get back to me with further questions.

Paul Lamar

OK, more air.  The basic engine will do 200 HP with the air that the
standard port will allow.  That’s so much fuel per hour, meaning so many
BTU per hour, meaning some basic operating temperature.  And some Mazda
guys designed the cooling for that including the water and oil cooling
channels in the case.  Right?


So you make the port bigger – a 2” “P” port, allowing more air and the
ability to gin out 300 HP.  That HP requires an increase in heat input
(increase in fuel input) doesn’t it?  How is all that extra heat handled
in the engine’s case (temperature) and all the extra heat (inefficiency)
handled as reject heat?

OSH being Oshkosh?  Aaaah, next summer (I say once again).

*Jim*.

It does not appear to bother the engine but you will need a
larger rad and oil cooler.

Paul Lamar


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