I am in the process of designing and building
 a 321 SS tang muffler for my P-port RX8 engine.
 I am using a $55  Mazdatrix RX8 flange.

 Does anybody else want one as I am having  the
 SS water jet cut? It will look something
 like this. If  I don't hear from anybody
 I am only going to make one and the  price
 will go up if you want one later.

 If it turns  out to be not quiet enough you should
 be able to use a second Flow  Master muffler under the
 airplane to quiet it further. By that time  the
 energy in the exhaust should be far enough down
 so the  stock automotive muffler should live.
 The RX8 engine is easier on  mufflers to begin with.

 I am not guaranteeing anything as the  Wankel
 always surprises :)

 Paul  Lamar

 Paul, am I missing something here???

 You stated that this muffler is for a P-port RX8 engine yet it seems as if
 your drawings are for the standard renesis exhaust setup.

 I could be mistaken but when you convert to PP, doesn't the exhaust come
 peripherally out of the  two trochoids, rather than going through the end
 and middle plates as in the unaltered variety?  Wouldn't this yield 2
 ports
 with 2 headers into the muffler?

 Unless the drawings are for a 3 rotor, in which case they make sense to
 me,
  there are 3 headers coming out of the engine, front, back and mid plates
 as in  the unaltered renesis

 Enquiring mind wants to know

 Rich

 The p-port RX8 engine still uses the side exhaust. It idles as well as a
 stock 13B and it is quieter and less destructive on mufflers than a
 p-port 13B. I was plesantly surprised to find almost no loss of
 power over a p-port 13B.

 Check out http://www.youtube.com/watch?v=NKJ00JsnS8A

 BTW Jeff is taking over making p-port rotor housing out of your rotor
 housings. He is much better equipped to do that than me.
 Contact Jeff at jeff doddridge <4starr@cox.net

 Paul Lamar

Paul,

I'm sure you've beat this to death, but since I'm just recently getting your
list emails again.... Can you give me some detail on that engine on the dyno
in the video? Based on what I can see in the video looks like a PP Renesis
with no real intake manifold to speak of - just a couple of throttle bodies
stuck on the stubs. Looks like HP peaked at 189 at somewhere in the mid 6000
region? Any fuel consumption numbers? Is this just a dyno mule or has this
engine been bolted to an airplane and flown?

Mike Wills

That was a weber in the video. We got 250 HP at 7500 RPM which is
the normal takeoff RPM with a 2.85:1 gear box. We now use a slide
throttle. Hopefully Mark Suspinski is going to fly his
Mustang II p-port/slide throttle rotary again shortly.
Minor off runway damage.

For a complete summary of what people are building now read.
http://www.rotaryeng.net/fund-of-intake.html

http://www.rotaryeng.net/Welded-steel-p-port.html

The entire section of the web sit devoted to intake systems.
http://www.rotaryeng.net/intake.html

Here is a series of pictures on how to assemble a slide
throttle kit courtesy of Craig Smith.

We still have kits in stock so scroll down to the bottom
of the front page. http://www.rotaryeng.net

No fuel burn numbers yet but it is a copy of the LeMans winning engine
port timing, intake runner diameter and slide throttle. That engine
achieved .47 BSFC.

Paul Lamar