Relative oil-film thickness has been measured in a main bearing of a fired, single-cylinder CLR engine. The bearing is electrically insulated from the block and a small voltage impressed between the bearing and crankshaft. When film thickness becomes less than a critical value, a series of electrical discharges occurs. The relative film thickness is determined by the extent of the electrical discharge.Relative film thickness was found to increase with speed and viscosity and decrease with load as predicted from the Sommerfeld parameter. Oils containing V.I. improvers gave thinner oil films than predicted by their low-shear viscosity, but slightly thicker films than predicted by their high-shear viscosity. One oil, containing a low molecular weight polymer, was even better than its low-shear viscosity Newtonian counterpart.


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    Title :

    Oil-Film Thickness in a Bearing of a Fired Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1982



    Publication date :

    1982-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Oil-Film Thickness in a Bearing of a Fired Engine

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    Girshick,G. / Craig,R.C. / Exxon,US | Automotive engineering | 1983



    Oil Film Thickness in a Bearing of a Fired Engine — Part IV: Measurements in a Vehicle on the Road

    Schilowitz, Alan M. / Waters, Jeffrey L. | SAE Technical Papers | 1986