- Feb 16, 2019
- Reaction score
- Fremont, CA
Well ,I have the blanks ready to make new rings using the 'No Heat Treat method'. Where the rings are over size to begin with, compressed to cylinder Dia. for machining both ID and OD at a preset end gap. Will go to this step if don't get a POP, and the vacuum and compression indicate the need.Ken:
I've had good luck stopping ring rotation by controlling the amount of clearance between piston groove and ring.
I've done my set of rings using trimble method, then machining them in a very accurate and well centered spigot with the right dimensions based on the ring and bore and ran my engine for several hours to the point of having some pops but no sustained run, so I opened the pistons to replace rings and they were in the same location where they were installed..both pistons had decent be in of rings but compression was low (1round 10-12 PSI) I think we need to achieve over 20 PSI's to get a decent pop..
Funny thing is most times I start with 20 plus PSI and then trying to bed in the rings, compression goes down to almost 5 PSI and then slowly start to come back up when the bed in the cylinder.
At this point in time, I think the need for pinned rings is not necessary. Good rings and controlling the ring groov gap to ring to be under 0.005 in would be sufficient to stop the rotation, my rings are 0.062 thick once polished on the sides and the groove in the piston is 0.063 in.