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Effect of Oil Rheology on Journal Bearing Performance: Part 4 - Bearing Durability and Oil Film Thickness
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 1989 by SAE International in United States
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A 288 hour cyclic durability test has been developed Co determine bearing wear in the big-end bearings of a 2.8 litre V-6 gasoline engine. Bearing wear for a 5W30 oil with a high-temperature, high-shear (HTHS) viscosity of 2.5 mPa.s is at least as low as that for SAE 30 to SAE 50 monograde oils. Minimum oil film thickness, (MOFT)0, under steady-state operating conditions has also been determined in the big-end bearing of the same engine. There is a critical value of (MOFT)0 below which catastrophic wear occurs. Correlations between (MOFT)0 and high-temperature, high-shear-rate viscosity show that the latter parameter is deficient as a measure of lubricant load bearing capacity. It is concluded that measurement of (MOFT)0 in an operating engine is the optimum test for the routine assessment of lubricant performance in a journal bearing.
CitationBates, T. and Toft, G., "Effect of Oil Rheology on Journal Bearing Performance: Part 4 - Bearing Durability and Oil Film Thickness," SAE Technical Paper 892154, 1989, https://doi.org/10.4271/892154.
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