I just figured out why the NSU RO-80 p-port idles well
and works so great. I never noticed this before.
Here is a shot of the NSU Wankel Spider
motor showing the two stages of the P-port.
The RO-80 was a two rotor version of this engine.
Obviously the big p-port hole is not used at idle.

Paul Lamar

So they are using the small port for idle, and the large port, or both for
high RPM?
Royce

Probably both.

Paul Lamar
 
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