Mailing List flyrotary@lancaironline.net Message #33359
From: Bobby J. Hughes <bhughes@qnsi.net>
Subject: RE: [FlyRotary] Exhaust system
Date: Fri, 25 Aug 2006 16:22:58 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
One more thing about this muffler. You can hold your hand on the muffler for a long time after the engine has started. The pipes are hot but the outside of the muffler was not. Dennis had a optical thermometer and took a few readings at idle and after a full throttle run. Don't remember exactly but it never got very hot.
 
Bobby


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of the mallorys
Sent: Friday, August 25, 2006 3:41 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Exhaust system

I've looked back through the archives, and seen lots of different ideas for exhaust systems.  But no real definitive answers.
 
There is the Cool tube exhaust that has very short pipes,like Bob White posted.
There is the medium length, no muffler system like Buly has or like Joe Hull has mocked up.
There is the really long tubes with muffler hanging under belly like Tracy has.
 
Do we know what the correct length tube is to tune the exhaust for our RPMs?  Does this length include the muffler?
 
It appears the diameter most used is from 1.5 to 2".
 
What about the different mufflers?  I only found two mufflers named in the archive that guys are happy with, the Flowmaster Hushpower II, and the Moroso Spiral Flow Racing Mufflers.  Last year at Shady Bend, Monti talked about noise levels and testing different mufflers and pipes.  Are there ant results from that?
 
I'm ready to start mocking up my exhaust, so am seeking the collective wisdom of the group.
 
Chris
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