ORIGINAL: downunder
(rings are more forgiving of dirt ingestion). Ringed engines though are limited to around the 20,000 area where the ring can start to flutter, or vibrate, in the ring groove.
Ah!
Thanks for clarifying that.
I know there were many complaints about the deterioration of the original O.S. AB liners, but I believe that has been cured with the more current engines.
So which to choose if all else is equal and you will not be approaching RPM limits?