This paper presents unpublished data on physical properties and bond strength of heavy duty piston ring facing materials including the presently used chromium and molybdenum.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.
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