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Old 09-08-2009, 01:05 PM
BarelyAWake's Avatar
BarelyAWake BarelyAWake is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: Maine
Posts: 7,212
Default Re: "TUNABLE EXHAUST"- A valid concept?

I think SpookyTooth has a pretty good explanation here;
Spooky Tooth Cycles - Motorized Bicycles: Gas Powered and Electric Bikes - Expansion Chamber Exhaust

Or for a more comprehensive explanation here's the wiki for expansion chambers;
Expansion chamber - Wikipedia, the free encyclopedia

What it amounts to is those hot rods are four strokes, the "wave" created by a properly placed expansion chamber on a 2 stroke helps mimic the effects of valving.

Hope this helps

Last edited by BarelyAWake; 09-08-2009 at 01:09 PM.
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