Quote:
Originally Posted by ism409
The stingers are mearly silencers and have nothing to do with back pressure LOL!
As the exhaust gases expand into the expansion chamber, they create a vacuum at the exhaust port. This vacuum pulls fuel/oil/air into the cylinder.
As the shock wave of the exhaust pulse hits the end of the expansion chamber, it echoes back, pushing any fuel/oil/air that got pulled through the exhaust port back into the cylinder.
By pulling extra fuel/oil/air through the cylinder and then pushing it back in, the expansion port has the effect of stuffing more fuel/oil/air into the cylinder on each stroke. This gives the engine extra power in the same way that a turbocharger does with out any moving parts.
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Well said...of all people I should hope you would know this.
But regarding the pushing and pulling motion the expansion chamber causes I would assume that's a form of backpressure and that wouldn't be possible if the can's were the same size as the expansion chambers.