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Effect of Some Lubricant and Engine Variables on Instantaneous Piston and Ring Assembly Friction
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English
Abstract
The Instantaneous IMEP method has been used to measure piston and ring assembly friction in a production Chevrolet 1.8 litre L-4 and a 5 litre V-8 engine modified for single-cylinder operation. Friction measurements are reported at different loads and speeds up to 1640 RPM under firing and motoring conditions with various oils and before and after break-in of the oil ring. Oils used were SAE viscosity grades 30, 50 and 30 with a friction modifier.
Differences were found between motoring and firing friction, especially on the power and exhaust strokes. These differences diminished at higher speeds and lower loads where lubrication was more hydrodynamic. Differences in response to viscosity and friction modifier changes were noted between the two engines.
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Citation
Uras, H. and Patterson, D., "Effect of Some Lubricant and Engine Variables on Instantaneous Piston and Ring Assembly Friction," SAE Technical Paper 840178, 1984, https://doi.org/10.4271/840178.Also In
References
- Uras, H. M. Patterson D. J. “ Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method ,” SAE Paper No: 830416 1983
- Millington, B. W. Hartles, E. R. “ Friction Losses in Diesel Engines ,” SAE Paper No: 680590 1968
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- Greene, A. B. Risdon, T. J. “ The Effect of Molybdenum-Containing, Oi1-Soluble Friction Modifiers on Engine Fuel Economy and Gear Oil Efficiency ,” SAE Paper No: 811187 1981
- Furuhama, S. Sasaki, S. “ New Device for the Measurement of Piston Frictional Forces in Small Engines ,” SAE Paper No: 831284 1983