No pressure ends up wasting fuel, and making the engine loose power. To my understanding, in an expansion chamber, the sound waves pull fuel out of the cylinder in the first cone, and then they reflect off the last cone, and force more fuel back into the cyl.Kenny_McCormic wrote:how does no backpressure mess up your engine?
iv yet to see an explanation
Even on a 4 stroke, no backpressure messes up fuel economy. I had a Murray pushmower that would run about an hour on a tank (about a quart) of gas (and half a quart of oil
) on the stock muffler. I made a new pipe for it from some 1/2" NPT galvanized fittings, and by the time I was done, I could mow about 1/2 hour on a tank of gas, and it would stall in the grass often. Before, I could mow down small trees without much of a problem with that mower.Plus, a really loud pipe does get kind of annoying, if it doesn't sound cool. Last winter, my Kawi 185 four wheeler had a bad exhuast leak at the header. It sounded terrible, and not like performance exhaust at all, and to go drive out on the lake (frozen), I'd wear ear protection, so my ears weren't ringing after driving it.
