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, Way to go.  These are wonderful results.  I was worried that the
p port might only be available to 13B's because of the Renesis side
exhaust ports.  Clearly that is not a problem.  Using the 52mm carb,
the results are quite good.  I would be happy with that level of
performance up to 7500 rpm, but it will be interesting to see what
happens with the 58mm carb.  Was the insert .063 seamless ms tube  or
4130?  Also, did you back up with JB Weld?      Jerry

It was 304 stainless tube with .049 wall. I don't think it is seamless
however. I got it from Burns Stainless. BTW bore your holes at least
2.005 or 2.010 as the tolerance on the SS tube is rather loose or not perfectly
round.

Yep. John at Mazdatrix sealed the rest of the water jacket around the SS
tubes with JBWeld. No leaks.