FITTING IN A SIZE SMALLER
After file fitting piston rings to get the perfect end gaps, we need to remove all burrs left from the filing process. Despite all our best efforts, sometimes we install a ring on the piston and still notice a little drag when testing for rotation. I like to test fit my ring chamfering and rotation on a smaller bore piston with the same ring thickness to check for drag so that I am not removing, reinstalling, and overextending the rings for a second time if I must touch up my ring chamfer.  

Dave Matton
D and D Auto Machine
Bloomington, MN
August, 2022