Good article. Thanks for sharing
Good article, everyone should give it a read before getting a pied piper magic pipe
do circuit-type exhausts work in a markedly different way then the standard, cigar-type pipes he's talking about? how about twin exhausts?
The sound wave does not care so much about corners as that it's travelling in a cone. Different exhaust routing results mostly from necessity of fitting the properly dimensioned exhaust on the bike, all the pipes are like the 'cigar', just bent into a shape, plus a silencer now days.
If you are interested the exhaust chapter in Gordon Jennings two-stroke tuner's handbook is really good and talks about all that.
"You'll know when you have the design right, because the chamber will then be impossible to fin on the motorcycle without having it drag the ground, burn the rider's leg, or force the relocation of one or more major components".
-Walter Kadeen, former chief engineer of MZ's racing department.
Yup this should be required reading: wiki wiki wiki wiki
It would be an awesome, but difficult task, to graph out each pipe for all brands of mopeds depending on frequency. Then you could get really into matching up parts.
frequency, you mean like a power/rpm graph? this actually has me thinking, i wonder if you could build a 'pipe dyno' to simulate having an engine attached... possibly with some sort of subwoofer speaker or something. hmm.
Can't place in wiki... copywrited.
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