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


HI PAUL WHAT KIND OF PRICE ARE YOU LOOKING FOR



Jean Prudhomme



I won't know exactly until I get it done but my wild ass guess
is $400.

Paul Lamar
-what about 13b engine for rv7a thanks for the motormount
plans Keith-

That is down the road. I have an immediate need for my dyno
engine so I will do an RX8 muffler first. I will publish the
plans however for the 13 B and RX8 versions.

Each person has his own sets of skills and tools so some
may want to make their own. Speaking of that I am going
to Harbor Freight tomorrow and checking out a sheet
metal nibbler. If it looks like it can handle .065" thick
321 SS that may cut the cost for everyone as normally
321 SS must be water jet cut. Plasma cutting does a crappy
job on .065" thick SS. 2 mm or .078 seems to be the lower
limit.
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Here is some more info on the RX8 muffler along with the dimensions.

5.5 inches in diameter with a 2 inch cooling tube welded
through the center. All .065 wall 321 SS. The muffler is
a slip joint with the flange assembly. The main part can
be sheared and notched but the ends will be water jet
cut.

Paul Lamar

       
Yes Paul i am interested on one so far and the second much later and the exhaust pipe have to be straight down



Jean Prudhomme
              
The exhaust pipe will be a 1 7/8 OD two inch long stub so you can build your
own down pipe out of 2 inch tubing. Not shown in the 3D yet.

I think 2 inch .049 wall 304 tubing
will work fine for a down pipe. It will be a slip fit on the stub.
There are several ways of keeping it on. The classic way is a couple
of tabs and springs.

Paul Lamar