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

Finn Lassen wrote:

Here are a couple of pictures of my muffler before welding on the end plates. When
punching (burning) the holes in the exhaust pipe (inside the muffler) I tried to
get about the same area as the header and exhaust pipe area, about 3 sq inch.

Finn

Keep alert for a slow loss of power Finn. That internal structure could slowly
melt and partially or completely block the outlet. If it can happen in my
C182 with a piston engine and long exhaust manifold pipes it can happen 
faster with a rotary.

Paul Lamar


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