Piston ring-cylinder bore friction modeling in mixed lubrication regime: Part II - Correlation with bench test data

A bench friction test system for piston ring and liner contact, which has h igh stroke length and large contact width has been used to verify the analy tical mixed lubrication model presented in a companion paper (Part I). This test system controls the speed, temperature and lubricant amount and recor ds the friction force, loading force, crank angle signal and contact temper ature data simultaneously. The effects of running speed, applied normal loa d, contact temperature and surface roughness on friction coefficient have b een investigated for conventional cast-iron cylinder bores. Friction coeffi cient predictions are presented as a function of crank angle position and r esults are compared with bench test data. Analytical results correlated wel l with bench test results.