Paul,

I have been reviewing my p-porting notes.  Could you tell me where the
throttle is on these pictures of Allen Toole's engine is.  I am guessing it
must be in the intake chamber surrounding the air filter but it is not
shown.


Thanks


DougFir

There are two butterflies almost in the rotor housings.
The pressure drop across these and the smaller size
of the runners, about 1.75" OD instead of two inches OD,
limits the HP to about 215 at 6500 RPM instead of 240
to 250 at 6500 RPM we got using 2 inch OD runners and
a Weber carb. You will get more with the slide throttle.
http://www.rotaryeng.net/Weber58-24.5inch-runners-dyno-curve2.jpg
http://www.rotaryeng.net/Weber58-28inch-runner-dyno-curve.jpg


Paul Lamar ...No rotor no motor.

Paul

Thanks for the info. Something Fred said last year got me thinking that if
the slide throttle hole in the throttle plate was designed correctly (sort
of like a 'comma' mark on its side,  only the top corner of the hole could
be exposed during idle.  This might possibly eliminate port overlap during
low rpms.

Cheers

DougFir


I just got a email from PS and a P-port HP curve.

Correction...
The PS engine is limited to 215 HP at 6000 RPM and not 215 HP
at 6500 RPM. Sorry. I was going on my memory. Interestingly enough
using a 58 MM Weber carb and 28 inch runners we got the same HP at
the same RPM as they did with EFI but our dyno curve continues
to climb while theirs drops off.
Both engines had butterflies for throttles. Our butterflies
were in the carb and theirs were in the rotor housing.

Paul Lamar ...No rotor no motor.

Ops a little misleading. The numbers are the same at 5600 RPM
but we got almost 230 HP at 6000 RPM instead of 215 HP at 6000 RPM.

Paul Lamar

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