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Rotax 447 muffler how it works

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cptcliffhanger

Well-Known Member
Joined
Jul 20, 2017
Messages
55
Location
san diego
I ran my 447 over the weekend and was impressed to see how quiet it is.. I wonder if anybody knows/understands the workings, and perhaps recipe for the rotax mufflers we see on nearly all 2 stroke rotaxes.. I'd like to be able to use the recipe on different 2 stroke engines if anybody can describe how displacement and RPM etc.. affect the internal sizing of chambers and tubes to recreate such good power band and silencing as this:

1601319877530.png
 
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