Ben Baltrusaitis wrote:

Does anyone run their 20B without a muffler?
I was told by an engine builder that the sound of the 20B is not as intense as the 13B and could be run without a muffler. He said the sound was much like

a

piston V-6.
Thanks!
Ben

Ben If you don't care for your hearing or your airport you could go unmuffled. (Note that this is a JOKE if there is a language problem)
The rotary is one of the LOUDEST engines you will EVER hear if not muffled. That includes the 20 B, the housings being close enough to the 13 B that they are
interchangeable. The three rotor will just have a more continuous enormously
loud exhaust. Don't plan to run any rotary without at least basic muffling.
Let me put this in an understandable context. I am an ex-racer and race car
builder. I have helped build a RX 2 sedan racer back when you could run
most tracks without a muffler. This engine was PAINFUL when wearing foam
earplugs INSIDE my regular earmuffs! Standing in the path of the RX2's
exhaust hurt worse than standing next to a AA Fuel dragster durring a
burnout. The fueler was technically louder (on a DB meter) but the pitch
and timber of the rotary exhaust can be very offensive. DON'T RUN
WITHOUT A MUFFLER. Your ears will thank you for it.
Bill Jepson

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