We now have Mazdatrix dyno runs on the 2 inch steel tube welded RX8 p-port
engine.

Far more torque and HP than the RX8 high power engine in the
6000 to 7500 RPM range. This is the range we use with the 2.85:1 PSRU.
This had a 52 mm Weber carb which unfortunately is smaller
than the 58 mm Weber carb we used on the 2nd gen p-port engine
dyno runs. The 52 mm carb is showing signs of being too small.

The 2nd gen P-port engine is now running in Mark Suspinski
Mustang II. Hopefully that will fly soon.

Dave Lemon commented that the engine had extraordinary stand off fuel/air mist
above the carb with the stock RX8 exhaust manifold. This is to be expected
as organ tuned p-ports don't like exhaust back pressure. We use ram air
plenum's
so this is not a problem for us. A supercharger exhaust manifold and stright
through
muffler reduced the stand off and increased the power. Dyno run B.

More pictures on Monday and perhaps a video of the engine running on the dyno.
-- 
Paul Lamar ...No rotor no motor.


Congrats Paul, Can't wait to see the video! How well will this work with
the 6 port?

Rick in Alaska

That is the six port RX8 engine.
The four port version is no longer made anyway.

Paul Lamar

Paul,


Congratulations.  235HP on the first few tries is pretty good.  Better than
the standard setup at 220 or so.  Our you going to try fuel injection in
which case the hp should get even better?

Doug in Japan.


I think we can get a bit more with the 58 mm carb. I am going to try
to talk Dave into taking the 58 mm off his race car engine and installing
it on the RX8 p-port engine. We got about the same HP we got last year with
the 28 inch runners and p-port exhaust. Probably within dyno error.

I suspect we are a bit long on the runners. I think 24.5 inch will give us
more of what we want. Here are the curves from last year.

I am going to fool with the mechanical fuel injection off the dyno and on a test stand
until I have it working pretty well and then I may put the engine back on the
dyno.