Author Topic: Step in the exhaust port  (Read 555 times)

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Offline aclarke

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Re: Step in the exhaust port
« Reply #30 on: June 02, 2014, 07:00:24 pm »
I don't think a muffler motor is gonna have the ability to fill the crankcase and take advantage of the extra volume like a motor with tuned pipe, so smaller may pump more efficiently granted the ports are designed to keep the added flow from going out the exhaust . Lots of conflicting info about case volume and pumping efficiency online, hard to make sense of what's optimum

 

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