Jerry Hey wrote:

I have often heard that the rotary needs a free flowing exhaust.  Does
that mean that it would run best with short stubby straight pipes?
Is
the tuned exhaust more efficient than no exhaust?   Considering the
simple tangential muffler, if the exhaust pipe from the muffler has a
larger area than the combined area of the two pipes feeding it, would
that be considered "free flowing."  Consider two 2 inch pipes feeders
at 6.28 sq. in. and a single 3 inch outlet 7.069 sq. in.   Another
question:  when the exhaust gas enters the "can" of the tangential
muffler it is going to expand, slow down and become more turbulent.
Would the gas lose significant heat as a result?   Thanks,  Jerry

The P-port runs best with 32 inch long open pipes at 6000 RPM.
27 inches long at 7000 RPM. Better than no exhaust. I would say yes
on the larger exhaust pipe coming out of the muffler.
The muffler works by losing heat. As the pulses come out they zing
around inside the can losing heat to the skin.
Paul Lamar

The can skin is a  large surface area that can dissipate a lot of heat.
I wonder if 304 x .065  SS could be used for the can? It is available
in the right diameters.    SS types   321,  253MA, and inconel will
have be rolled and welded. And they are so expensive.  Jerry

304 is fine as long as it is .049 or thicker. .035 won't cut it.

Paul Lamar
 
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