The Effect of Molybdenum-Containing, Oil-Soluble Friction Modifiers on Engine Fuel Economy and Gear Oil Efficiency 811187
A selection of molybdenum-containing, oil-soluble friction modifier additivas were tested comparatively in engine dynamometer tests on gasoline and diesel engines; the tests measured variations in brake specific fuel consumption with speed. The results indicate improvements ranging from 3% to 5%.
A similar selection of molybdenum-containing additives were evaluated in terms of transmission efficiency in a hypoid-gear, rear-axle test rig; the baseline oil was a formulated SAE-75W gear oil. Improvements in efficiency averaged 1-3%.
Bench-scale friction tests utilizing the Press-Fit, Timken and Four-Ball test devices were employed to establish a correlation between small-scale rigs and full-scale engine tests.
Citation: Greene, A. and Risdon, T., "The Effect of Molybdenum-Containing, Oil-Soluble Friction Modifiers on Engine Fuel Economy and Gear Oil Efficiency," SAE Technical Paper 811187, 1981, https://doi.org/10.4271/811187. Download Citation
A. B. Greene, T. J. Risdon
Department of Transport Technology, University of Technology, Loughborough (U.K.), Climax Molybdenum Co. of Michigan
1981 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Engine Oil Effects on Vehicle Fuel Economy-PT-27