Quote:
Originally Posted by Excaliber
Well don't stop there,,, and those other issues might be????
...hold's Olddogs feet to the fire... 
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I'm a student here, not the master. Not even an apprentice yet.
My thought would be that if the leaking gases past the gaps tend to act like a pin that prevents rotation then the wider the gap the more powerful the affect. That is a totally theoretical thought based on the discussion in this thread, which I find very interesting.
I'm not certain that ring rotation is necessary. It would seem to me that the rotation would help to round out the cylinders, by randomizing where the tight spots tend to wear things. However it also occurs to me that at some point in time when the thrust starts to wear the cylinders out of round, the rings are going to stop turning and tend to wear out of round to match the bore. Now I'm way out on a limb, because I never spent the time studying worn out engines and trying to understand all these things.