Two programs were conducted to study the relationships between engine oil rheology and crankshaft bearing wear. A Chassis Dynamometer test of four oils in four cars was used to explore and define the key variables affecting bearing wear. These results were used to design a Field Test of nine oils in 45 taxicabs in New York City. The test oils (SAE OW-20 to 20W-20) were formulated to measure the effects of viscosity, viscosity index improver, and detergent inhibitor package. Bearing wear tended to be either low and unremarkable or very high, particularly in the thrust bearings. Oil performance was best expressed as the frequency of excessive wear, rather than by quantitative wear measurement. There were many instances of very high wear in cabs operated with the lowest viscosity oils but none in cabs with higher viscosity oils. Non-Newtonian oils appeared to provide slightly more protection than Newtonian oils of the same HTHS viscosity, and a higher quality adpack also appeared to provide benefits. However, these factors were secondary to the viscosity of the oil. HTHS viscosity was a better predictor of bearing wear performance than oil film thickness.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Engine Oil Viscosity and Bearing Wear: Field Test Results


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 1992



    Erscheinungsdatum :

    1992-10-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The Effects of Engine Oil Viscosity and Composition on Bearing Wear

    Henderson, B. M. / Rhodes, R. B. | SAE Technical Papers | 1981


    The Effects of Engine Oil Viscosity and Composition on Bearing Wear

    Rhodes,R.B. / Henderson,B.M. / Shell Dev.,Westnollow Res.Cent.,Houston,US | Kraftfahrwesen | 1981


    NEXT Ion Engine 2000 Hour Wear Test Results

    Soulas, George / Kamhawi, Hani / Patterson, Michael et al. | AIAA | 2004


    NEXT Ion Engine 2000 Hour Wear Test Results

    Soulas, George C. / Kamhawi, Hani / Patterson, Michael J. et al. | NTRS | 2004


    Engine Oil and Bearing Wear

    Lonstrup,T.F. / Smith,M.F. / Exxon,Paramins Technol.Div.,Linden,US | Kraftfahrwesen | 1981