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Testing the Fuel Economy Characteristics of Engine Oils
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English
Abstract
This paper presents new techniques for the interpretation of engine and vehicle results on prototype fuel-efficient motor oils. A case history is presented which follows the component selection process through laboratory friction and bench engine screening tests. The resulting optimized lubricant formulation was demonstrated in an automobile dynamometer test, resulting in approximately 2% better MPG than that of the proposed ASTM SAE 20W/30 reference oil.
The capabilities and limitations of the available test methods are discussed from the perspective of PARAMINS experience. An important part of FE data interpretation is the comparison of experimental results to the estimated maximum realizable friction reduction and fuel savings potential. This requires an understanding of the portion of total mechanical friction contributed by solid-solid (boundary) friction and by viscous (hydrodynamic) losses. The authors show how laboratory friction measurements were used as a means for examining vehicle results in these terms.
Authors
Citation
Lonstrup, T., Bachman, H., and Smith, C., "Testing the Fuel Economy Characteristics of Engine Oils," SAE Technical Paper 790949, 1979, https://doi.org/10.4271/790949.Also In
References
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- Waddey W. E. Shaub H. Pecoraro J. M. Carley R. A. “Improved Fuel Economy Via Engine Oils” Paper No. 780599 SAE Passenger Car Meeting Troy, Michigan June 1978
- Ethridge J. “The New Super Oils” Motor Trend October 1978
- Douaud A. Eyzat P. “DIGITAP - An On-Line Acquisition and Processing System for Instantaneous Engine Data - Applications” Paper No. 770218 SAE International Automotive Engineering Meeting Detroit, Michigan February-March 1977
- “Tentative Draft: Fuel Savings Engine Oil Test Procedure” ASTM Fuel Effcient Engine Oil Test Development Task Force April 1979
- Heldt P. M. “High-Speed Combustion Engines” Chilton Company Phila. 1956
- McDonnell T. F. Tempe S. A. “The Effects of Engine Oil Additives on Vehicle Fuel Economy, Emissions, Emission Control Components and Engine Wear” Paper No. 780962 SAE International Fuels and Lubricants Meeting Toronto, Ontario, Canada November 1978
- “Survey of Lubricant Influence on Light-Duty Vehicle Fuel Economy” Coordinating Research Council New York December 1978
- Haviland M. L. “Automotive Fuel Economy Gains Through Lubricant Technology” Tribology in Energy Technology Conference Washington D.C. February 1977