I agree about not polishing the E port. I don't know if I'd use the work "rough" to describe it though. I'd call it smooth, but not overly so, and well shaped. It works for me. It's been my experience that a well designed smooth port works much better than the same port finished to a reflection. I'm not as concerned with the "stuffed" charge getting mixed a little better as it passes that port a couple of times - even if it does travel some six inches away from the face of the piston and back during its rant (in the TRX engine), but I am concerned with reducing the attraction the spent gasses seem to have when passing a shiny surface. As RD said - the boundary layer. Get rid of it. It turns out even inanimate objects are attracted to shiny things.
Port walls with a little texture do not "wipe" as clean as their well polished adversaries, but if using AmsOil it's very close to the same. Some of the oils out there could cause real trouble because of their ash deposits upon burning which could make maintenance a thing to think about a little more, I suppose. But, like I said, the best oil - AmsOil, levels the playing field.
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