Re: QUIET EXHAUSTS

Posted by seestheday on Mar 15, 2012; 7:51pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/QUIET-EXHAUSTS-tp3824396p3829849.html

Errr... I'm pretty sure that the reason the glass packing works is because it physically absorbs the sound waves and transfers it into kinetic energy.  The kinetic waves would cancel each other out to some extent, and the rest would be transferred into the motorcycle, but it's so small you won't notice it because the engine  alone generates much more kinetic movement (vibrations etc).

If it was only in-phase/out-of-phase cancellation then you'd have some coordinates in space that were quiet, but if you moved your head a little bit it would be extremely loud (think of dropping two pebbles into still water and watching the ripples interact with eachother, but mapped into 3-d space).

Now if you'll excuse me, I'm going to put on my pocket protector and go back to my game of dungeons and dragons.