Paul,

I read about P Porting on the turborx.com site, and they say that

1.  the engine won't idle much below 2000 rpm
2.  shorter engine life
3.  "needs an exhaust system designed to produce excessive noise"

As I recall, the 13B can produce about 180 HP at 6K [with PP?]
and perhaps 250 HP with turbo and PP at 6K rpm.  I hope I am
remembering those correctly.

Anyway, if I wanted to retain better idle characteristics, and also
wanted a very QUIET exhaust system [like a car], what HP could
I achieve with just a "mild" or "street" [side] port and turbo?
Thanks again.

Gene Kahn


A p-port RX8 engine idles just as well as an old perip
exhaust port 13 B engine.

Forget all you know about auto engine RPM. A rotary is
just getting started at 6000 RPM.

They are wrong on both counts. The p-port engine will produce
300 HP at 9500 RPM. A turbo street car engine can and has  been
built with as much as 450 HP.

How quiet it is for a street car depends only on the muffler.

It all depends on how much HP you want for your street car.

Paul Lamar

Paul,

Lately I've been explaining the workings of the rotary engine a lot.  Mostly to my LycCon loving A&P brother.
I find it easier to speak in terms of rotor rpm and compare the engine to a turbine.   He agrees that for a  well balance shaft, 9000 output rpms is not a problem.   Next he pointed out geared engines don't last long.  I countered that it depends on the  power pulse, and torsional resonance  of the engine coupled to it.

A&P working on turbo props know better.  Turbo props  rely on  a robust planetary PSRU, and the rotating mass, and rpm,  of the components create centrifugal forces  much greater than a Wankle..   When I speak of turbines and the rotary stages with overlapping P-ports big bro. finally got  it.   Simple put, a Wankle is an internally geared gas flow device, like a turbine, except the stages and gas flow travel  radially not axially.

As long as we keep trying to compare the rotary to a piston engine and car applications, we will run into semantic challenges.

Doug in Japan

I might point out in theory the rotor phasing gears have no load on them.
However in practice it has been necessary for Mazda to tailor
the resonant conditions between the rotor and the stationary gear
to reduce stresses due to vibration.

Paul Lamar