Effects of reducing engine oil and rear axle lubricant viscosities on fuel economy were determined in EPA combined City and Highway (EPA 55/45) tests and in road tests, using four different sized cars. In EPA 55/45 tests, fuel economy rating improvements averaged about 1.5 percent;warmed-up and cold-start road test fuel economy improvements averaged about 4 and 8 percent, respectively. For a specific engine oil viscosity reduction, warmed-up road test fuel economy increased with decreasing car mass and power-to-mass ratio. Warmed-up constant-speed fuel economy improvements obtained by lowering only the engine oil viscosity were about the same as those estimated from reductions in engine friction power. However, measured fuel economy improvements with low-viscosity rear axle lubricants were inexplicably higher than those estimated. Although fuel economy results with low-viscosity lubricants were generally favorable, care must be taken to make sure the use of such lubricants will not reduce vehicle performance and durability under a variety of operating conditions. (DePo)


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    Title :

    Fuel economy improvements in EPA and road tests with engine oil and rear axle lubricant viscosity reduction


    Additional title:

    Einsparung von Kraftstoff durch Verminderung der Viskositaet des Getriebe- und Achsoels (Strassenpruefung und EPA-Pruefung)


    Contributors:

    Published in:

    Publication date :

    1978


    Size :

    19 Seiten, 19 Bilder, 11 Tabellen, 17 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Fuel Economy Improvements in EPA and Road Tests with Engine Oil and Rear Axle Lubricant Viscosity Reduction

    Goodwin, Malcolm C. / Haviland, Merrill L. | SAE Technical Papers | 1978


    Fuel economy improvements in EPA and road tests with engine oil and rear axle lubricant vissosity reduction

    Goodwin,M.C. / Haviland,M.L. / General Motors,US | Automotive engineering | 1978


    Fuel Economy - Contribution of the Rear Axle Lubricant

    Dixon, L. T. / Willermet, P. A. | SAE Technical Papers | 1977


    Fuel Economy - Contribution of the Rear Axle Lubricant

    Willermet,P.A. / Dixon,L.T. / Ford Motor,US | Automotive engineering | 1977


    Taxicab Fuel Economy and Engine and Rear Axle Durability with Low-Viscosity and Friction-Modified Lubricants

    Haviland,M.L. / Linden,J.L. / General Motors Res.Lab.,Fuels and Lubricants Dep., US | Automotive engineering | 1982