Top rings are plasma moly inlaid and barrel lapped for long life and quick seating. All Ross top rings are ductile and can be twisted at least 180 degrees and back numerous times without fracturing. Top rings are symmetrical, can be fitted in the groove either way and are coated with zinc phosphate to improve initial scuff resistance. Radial thickness on all Ross moly top rings in bore sizes from 2.756 through 3.494 (70 mm through 88.75 mm) is .125. All rings above bore size 3.499 (88.9 mm) are SAE “D” wall, except .043 compression rings.
Second rings are cast iron reverse torsion twist. The torsioning is obtained from the bevel on the inner lower edge. Other performance advantages are conformability to cylinder wall, good wear resistance, and a specific OD shape that will encourage downward oil scraping and minimize upward scraping. Ross second rings are also zinc phophate coated. Radial thickness on all Ross moly second rings in bore sizes from 2.756 through 3.494 (70 mm through 88.75mm) is .125. All rings above bore size 3.499 (88.9 mm) are SAE “D” wall.