Author Topic: Step in the exhaust port  (Read 643 times)

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Offline 3000 FPS

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Re: Step in the exhaust port
« Reply #10 on: May 28, 2014, 12:03:01 am »
I have to say I agree with Shaun on this.   A box muffler is way to short and to small to get the timing correct for the sonic waves to stuff any fuel mix back in to the cylinder.   If you can only open the port just so much before you hang a ring then putting a step in the exhaust port that will allow the exhaust gases to expand quicker will increase flow.  Unless I am missing something here.
PP 505, 475, 445.

 

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