This paper describes the friction characteristics of a 1.8 Litre J-car piston and ring assembly as influenced by oil rings of conventional design, but of varying tensions. In addition, the piston-ring assembly friction characteristics are reported for a set of oil viscosities ranging from 2 to 20 cSt with and without a molybdenum friction modifier. Multigrade oil results are shown also. Finally comparisons are presented between changes in friction measured by the Instantaneous IMEP Method and those measured by the dynamometer for the engine as a whole.Our results show large differences in piston-ring assembly friction as oil ring tension was varied. However, these differences became moderate after the oil ring broke-in. Both high and low oil viscosities increased piston and ring assembly friction. The friction modifier was most effective with a mid-range viscosity and provided virtually no benefit at viscosity extremes. The Instantaneous ÎMEP Method correlated well with dynamometer values under motoring conditions. The correlation under firing was relatively poor.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE International Congress and Exposition ; 1985



    Erscheinungsdatum :

    01.02.1985




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method

    Uras,H.M. / Patterson,D.J. / Univ.of Michigan,Ann Arbor,US | Kraftfahrwesen | 1983


    Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method

    Patterson, Donald J. / Uras, H. Mehmet | SAE Technical Papers | 1983


    Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method

    Uras,H.M. / Patterson,D.J. / The Univ.of Michigan,Ann Arbor,US | Kraftfahrwesen | 1985


    IMEP Estimation from Instantaneous Crankshaft Torque Variation

    Akishino, Katsuo / lida, Kazumasa / Kido, Kazuo | SAE Technical Papers | 1990


    IMEP estimation from instantaneous crankshaft torque variation

    Iida,K. / Akishino,K. / Kido,K. et al. | Kraftfahrwesen | 1990