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It is a Midwest P-port single rotor. About 40 to 50
HP with PSRU.
Air cooled rotor with blower.

Now Diamond Engines. Used in motor gliders in
Europe.

Paul Lamar ...No rotor no motor.

Paul,

Is that thing connected to the back the water pump? Why is there
another air filter in back?

-Ben

That is not a water pump.
That is the intake to a centrifugal air pump that
cools the
rotor.

It would generate 20% more power with a longer
intake
runner.


Paul Lamar ...No rotor no motor.

Paul:  How long of an intake runner to generate that
extra 20% more power?  And, would this length apply to
all types of rotaries?

Kevin

It depends on the RPM so about 22 inches. Exact length also
depends on runner diameter so that is a rough guess
for 6000 RPM.

BTW If you really want to soup it up change the steel
roller rotor bearings for silicon nitride roller bearings
and jack the engine RPM up to about 8,000 and  get another
30% more power. You will have to port the P-port some as
well. IMHO the reason these engines are red lined at only
6000 RPM is due to the centrifugal loads on the steel rollers
used for rotor bearings. They start to slip at 6000
RPM.

Paul Lamar ...No rotor no motor.

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