The relationship between the cold starting and and cold pumpability properties of multigrade engine oils is examined. The reasons why the high shear rate viscosities obtained with the CCS viscometer predicts an oil's startability characteristics but not its pumpability properties are discussed.The concept of viscosity versus shear rate curves at various temperatures are used to compare engine oils formulated with different VI improvers. Viscosity versus shear rate curves obtained with a pressurized capillary viscometer are compared to those obtained with a rotary viscometer.Finally, actual oil flow data obtained with a simulated engine gallery was shown to correlate with viscosity data obtained at a selected shear rate.


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    Titel :

    Determination of the Cold Flow Behaviour of Multigrade Engine Oils


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    1977 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1977



    Erscheinungsdatum :

    01.02.1977




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Determination of the Cold Flow Behaviour of Multigrade Engine Oils

    Bartz,W.J. / Wiemann,W. / Tech.Akad.Esslingen et al. | Kraftfahrwesen | 1977


    MULTIGRADE OILS

    MOXEY, JOHN G. | SAE Technical Papers | 1955


    Multigrade oils

    Moxey, Jr., J.G. | Engineering Index Backfile | 1955



    Investigations on the rheological behaviour of multigrade engine oils

    Bartz,W.J. / Tech.Akademie Esslingen,DE | Kraftfahrwesen | 1989