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Testing an Anti-Friction Coating in a Small Engine
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English
Abstract
This paper describes tests of friction-reducing coatings applied to single-cylinder, splash-lubricated, gasoline engines. The suppliers of the coatings anticipated a significant, (10-15%), decrease in fuel consumption as a result of covering most engine contact surfaces with a proprietary, FIFE-type plastic. However, a brief analysis indicates that possible benefits should be closer to 3% at high engine loads. To establish coating effectiveness, carefully controlled fuel economy testing of two engines was performed on a water-braise dynamometer at one engine speed and two output torque levels (approximately 70% and 95% of rated load). Test results showed increased fuel consumption on both coated engines compared with uncoated engines. Direct comparisons showed fuel consumption was 8% higher at full load and 10% higher at part load. This unexpected increase in fuel consumption was attributed to increased friction in the journal bearings of the engine. The coating interfered with the normal hydrodynamic lubrication,
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Authors
- M. D. Checkel - Dept. of Mech. Engineering, University of Alberta, Edmonton, Canada
- J. T. Baker - Dept. of Mech. Engineering, University of Alberta, Edmonton, Canada
- D. W. Kinnaird - Dept. of Mech. Engineering, University of Alberta, Edmonton, Canada
- K. E. Koenig - Dept. of Mech. Engineering, University of Alberta, Edmonton, Canada
- J. C. Koyanagi - Dept. of Mech. Engineering, University of Alberta, Edmonton, Canada
Topic
Citation
Checkel, M., Baker, J., Kinnaird, D., Koenig, K. et al., "Testing an Anti-Friction Coating in a Small Engine," SAE Technical Paper 891761, 1989, https://doi.org/10.4271/891761.Also In
References
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