Quote:
Originally Posted by 1project2many
There are many components to exhaust noise... Compression ratio, cam timing, pipe diameter, engine displacement, muffler location, cat vs no cat, ignition timing...
|
exactly.
resonance in an exhaust usually comes from unbroken tube length. long straight pipes will have more noise than pipes that are broken up by mufflers in the middle. if your mufflers have to be at the back, put a resonator or even a cherry bomb in the long section. same if your mufflers are at the front with a long section of pipe behind them. your exhaust will still be raucous when you stand on it but will be church quiet at idle and wont drone on the highway. the other factors 1p2m mention affect this too.
yamaha makes specialty engines but also makes pianos in a second division, there was an article how they collaborated to tune exhaust noises for different cars like the lexus LFA, which has some of the most gorgeous exhaust sounds I have ever heard.