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One piston engine, silent exhaust
I have a gasoline engine, model 168 (6,5hp). I need to modify exhaust system. Current one is to loud. I am looking for option to be as silent as possible. Muffler size can be max round tube, 77mm in diameter, max 20cm long, tube from engine to muffler is 1 inch in diameter. No need for power,... just not to be this loud. See picture:
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1988&stc=1[/IMG]
Any idea?
What to use in a muffler to lower the sound? Tubes, walls wit holes, foam,...?
I am looking in something like this:
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1989&stc=1[/IMG]
or
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1990&stc=1[/IMG]
or
[URL="http://i52.tinypic.com/zx5r9w.jpg"]
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1991&stc=1[/IMG]
[/URL]or how to design?
How it's done in motorcycles? If they lower the sound... ;)