Bang On! Mr. Rick Engman was doing all my lapping for years and never had a failure. He warned me that it is super important to hand polish them after the lapping has been completed. Regardless of who or how they were lapped or grinded, the hand polish must be performed!

cleaning process would be cool to see

Would be nice to see a video on what's the process of cleaning it after lapping?

Please keep this up. The people need to keep rotories alive!

Its amazing just how smooth lapping gets things

🐐

Super useful information! Thanks for uploading 👍🏻

Thanks

Do we really want a smooth surface? Honing in piston engines is a science now with the use of profilometers and careful attention is paid to the RVK vs RVP. It seems their goal is deep valleys with the peaks knocked down to produce plateaus between the valleys. This seems to provide the best oil retention. They're also coating the rings, have you tried coating the side and corner seals?

great video series to see the 3 different stages & surface finish as it progresses what is the machine your using?