The instrumentation of the big-end bearing of a 2.8 litre V-6 gasoline engine to measure bearing oil film thickness during engine operation is described. The electrically insulated bearing and the journal form a capacitor with the oil film as the dielectric. Synchronous measurement of the capacitance enables the determination of the minimum oil film thickness, hm, as a function of crankangle. The minimum value of hmfor a complete 720° crankshaft rotation can be measured to a precision of about 5%; it is little affected by chemistry of the engine oil performance package or by engine torque but decreases significantly with increasing oil temperature and increasing crankshaft speed.


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    Title :

    Effect of Oil Rheology on Journal Bearing Performance: Part 2 - Oil Film Thickness in the Big-End Bearing of an Operating Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    4th International Pacific Conference on Automotive Engineering ; 1987



    Publication date :

    1987-11-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






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