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.


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    Title :

    Effect of Oil Rheology on Journal Bearing Performance: Part 4 - Bearing Durability and Oil Film Thickness


    Additional title:

    Sae Technical Papers


    Contributors:
    Toft, G. B. (author) / Bates, T. W. (author)

    Conference:

    1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1989



    Publication date :

    1989-09-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Effect of oil rheology on journal bearing performance: part 4 - bearing durability and oil film thickness

    Bates,T.W. / Toft,G.B. / Shell Research,Thornton Research Centre,GB | Automotive engineering | 1989