There is strong valid research indicating that a rough (as cast) surface flows substantially more than smooth ports. The idea is that micro turbulance at the tube wall produces less restriction than smooth laminar flow. Modifying the shape and smoothing the port has no effect at all unless the engine is approaching its volumetric flow maximum. Wjth the port sizes on a tractor engine that would be in the 3500 to 4500 RPM range (where an H would be swapping pistons in the holes)unless way modified. JimN
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Today's Featured Article - Talk of the Town: What's in Your Tractor's Toolbox? - by Staff. This recent discussion on the Tractor Talk discussion board here at the on-line magazine drew so much response and proved to be so interesting that we wanted to share it with you here. The names of the people participating in the discussion have been left out to "protect the innocent" (to quote a once-popular television series).
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