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Author Topic: Step in the exhaust port  (Read 2158 times)

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Offline mdavlee .

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Re: Step in the exhaust port
« Reply #30 on: November 20, 2018, 07:18:13 pm »
Quote from: SquareFile on November 20, 2018, 09:10:25 am
Older thread but the topic interested me studying cylinders. I feel the step down is more of a "shelf" for ring support on a downward angled port. Remove it and I'm sure bad things are going to happen. JMO, it's not for performance, tho it could aid. I have no proof it does or does not.
It sure can’t hurt to leave it there when you raise the exhaust a lot. Some guys have blended it on the 7910 cylinders and they free port with as little as .030” off the base.
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