Originally Posted by ZoomZ

There is one more thing about piton ring wear, that for the life of me, I cannot find the drawings and explanations/details for.

In short, when you hold an engine at a constant RPM, the piston/rings tend to "Harmonize" in 1 spot on the cylinder walls. Causing wear on only this portion of cylinder wall.

By varying RPM, the pressure changes, and the piston/ring will "harmonize" on a different portion of cylinder wall.

I don't know if this makes sense and I wish I could find the illustrations to prove it.

Also, it may have only applied to cylinders which are 'choked'. Can't remember.