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Old 08-13-2009, 08:38 PM
restapukin restapukin is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: australia
Posts: 112
Default Re: Tips on quieting the muffler?

That's it, BarelyAWake .... but not only can the piston be seen through the intake... there is a part of the cycle when both inlet and exhaust ports are opened ... just after the exploded gases are let loose, when both ports are open

Gas flow and sound energy wavefront are two quite different matters...

think of the tidal wave surfing upriver against the flow & much faster than the river flow...

So this is why hitting the kill switch does not reveal the true noise level that comes from the intake when the engine is firing

his mark
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