The authors measured camshaft surface temperatures in two different gasoline engines: a Ford 2.3-liter overhead-camshaft engine with finger-follower and an Oldsmobile V-8 5.7-liter engine with rotating tappets and pushrods.Using unique surface thermocouples in the cam-lobes, we found that maximum cam-lobe temperatures occur at the cam-nose and increase linearly with speed and oil temperature. At high speed, the rotating tappet produced lower temperatures than the finger-follower.In addition, at maximum speed the cam-lobe temperatures in the ASTM Sequence V-D and IIID tests were similar--200°C. The similarity in these surface temperatures explains why both engines require similar zinc dithiophosphates (ZnDTP) for wear control. The surface temperature controls the surface chemistry.


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    Titel :

    Camshaft Surface Temperatures in Fired-Gasoline Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Yamaguchi, E. S. (Autor:in) / McGeehan, J. A. (Autor:in) / Graham, J. P. (Autor:in)

    Kongress:

    International Fuels & Lubricants Meeting & Exposition ; 1990



    Erscheinungsdatum :

    01.10.1990




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Overhead camshaft passenger-car engines

    Heldt, P.M. | Engineering Index Backfile | 1922


    Development Potential of Small Gasoline Engines with Port Fuel Injection and Twin Camshaft Phasing

    Phlips, P. / Kramer, U. / Pecher, G. et al. | British Library Conference Proceedings | 2001


    OVERHEAD CAMSHAFT PASSENGER-CAR ENGINES

    HELDT, P M | SAE Technical Papers | 1922


    Gasoline-engine camshaft wear:The culprit is blow-by

    McGeehan,J.A. / Yamaguchi,E.S. | Kraftfahrwesen | 1989


    Outboard marine engines having vertical camshaft arrangements

    KIM BO K | Europäisches Patentamt | 2018

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