Originally Posted by Ladder106
Never even heard of gapless rings before. Why are they good....or not?
In Total Seal's case, the rings are two piece designs where the second ring overlaps the gap of the first. I would never want to use a gapless 2nd ring (that is one that goes into the 2nd ring groove of the piston) because the top ring needs to be pushed against its bottom ring land in order to seal, and relies on a pressure differential between the area above and below the ring to do so. I'm skeptical of a two piece design in general, because as far as I can tell, there is nothing to prevent the gasses from getting between them (meaning the top portion won't do much to help facilitate sealing). In the end, if set up properly, the ring gap on standard top rings is close to nothing during operation (that is when hot) anyhow.