Jerry Hey wrote:

Hi everybody,   I'm new to this list which I find very educational.  I
just bought a 13B with Ross and Tracy Crooks ignition and fuel
injection.  The untuned tangential muffler looks like a good idea. I
assume that the exhaust gases enter the inner chamber thru perforations.
 How big and how many? Is the outer chamber packed with anything?
Thanks,  Jerry

No perforations. Anything in the way of the hot exhaust blast will melt and be
spit out the tail pipe. Keep it completely hollow. No packing.

The theory here is the exhaust pulses whip around inside the muffler forming 
a vortex and that is suppose to homogenizes the pressure difference and 
hence reduce the sound waves.

Paul Lamar
 
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