Ini stok paip mia CSI pic:
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From: yamahat135.com, thanks to bizzy.
Actually, it reminded me of this one:
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It's a Bose woofer interior design.
Looking at the design, here are my thoughts:
The manifold ends with a 'cone' shape, and extends with a perforated inline silencer before the exhaust gas enters the silencer chamber.
- The narrowing cut kinda like 2-stroke exhaust. It functions to 'supercharge' the compression as the exhaust pulse bounces back to the exhaust port.
There are 4 resonators, two long at the bottom, and two short above.
- These functions as resonators for different frequency range and making it so quiet.
The final pipe, between the two short resonator, brings the exhaust gas out into the atmosfera.
- From what I can observe, the exit is limited with a small hole.
I would think, first step to make mod to stock pipe without sacrifice the resonators, is to change the final exit hole (the one we can see from the end of the exhaust), making it bigger.
Charge is right, the stock pipe, not good for bikes with lots of fart, it cannot go out fast enough.
Added on August 28, 2010, 6:44 pmThis is what we saw just now:
ahh, I always like your detail-ness and refined explanation. I know how to do, but explanation wise real sux
the exit hole is big enough for 135cc.
The original design with disconnected pipe means... the gas must fill the tube first before the gas go out via a small hole. low speed ok, as that big piece of tube serve as a gas collector, but at high rpm, everything farked up.
in my opinion, we just need to make a direct connect from the 'honeycomb' pipe to the exit hole. No guarantee 100% is the perfect setting, but at least it will be much better.