Ken Powell wrote:

It's been 10 years since I last modified an expansion chamber, but I
think this post has it backwackwards.  A short / fat pipe is for high
RPM, and a long skinny pipe is for low RPM.  If you will remember, the
trials bikes did not appear to have an expansion chamber at all, 125CC
motocross pipes were short and fat, and Open class bikes had pipes
with a thin center section.  Could be wrong, but this is how I
remember it.

Ken Powell

That's the way we do it with 4 cycle engines
on the dyno, Ken.
Archie

 
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