New Developments in Piston Rings for High BMEP Engines

This paper presents unpublished data on physical properties and bond strength of heavy duty piston ring facing materials including the presently used chromium and molybdenum. Data on the new RC-1, RC-2, chrome carbide moly, and the new “moly-over” facings are provided, and low friction coatings are discussed. Engine test results on scuff and abrasive wear and performance in high bmep diesel engines are reported.