On 3/2/04 11:52 PM, "kevin lane" <n3773@comcast.net> wrote:

it has struck me that the rotary engine is quite similar to the 2 cycle as far as exhaust noise.   since some 2 cycle engines use resonators I wondered why this approach isn't also used.  last week dr. chuck Williams spoke at the chapter 782 meeting, a life-time expert on 2 cycles.  I couldn't get him to expound too much about exhaust, but found it interesting that he suggested a muffler with a rotor inside, just like a turbo, althought performing no work other than dampening the sound pulses.  has this approach ever been tried?  maybe that old joke about muffler bearings was true!  since he was mostly experienced with racing snowmobiles, he said they simply use very long exhaust pipes for noise suppression, although not a big concern in the racing circuit.  I have tried looking up info on resonator design, but haven't come across anything yet.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
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Yesterday I listened to a muffler with such a rotor on John Slade’s CZ. It’s called turbo charger :)
It works very good in killing the sound and helps with the power also.
Bulent