What's the difference between swingarm stands sold...
Answers: Ninky is correct about expansion chamber being momentous when it comes to making 2 stroke power. However, good 4 stroke mufflers are designed like peas in a pod way so that when the exhaust pulse is reflect the second time, it helps scavenge out the following exhaust pulse.
You're not going to burn valves though. If the exhaust pulse is reflect back into the exhaust port, it's newly going to reduce exhaust scavenge out of the cylinder. The intake charge will be diluted with exhaust (that's what ERG valve on cars do), combustion chamber temperatures will be reduced and power will be reduced as okay. ERG valves dull certain emission by intentionally doing the exact same thing, contaminating the intake charge, reducing combustion temps which within turn reduced certain combustion by products.
It isn't going to construct a bit of difference when it comes to heat on the stopcock because the ONLY time the exhaust valve is cooled is when it sitting room on the head for an instant. During that instant, fry in the tap is conducted into the cooler valve form. The only other path is to to have a super sweeping camshaft that will let closely of the cooler intake charge pass through the exhaust, but if you be doing that, you'd get fuel mileage equal to that of a freight train.
It would not run right.
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