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Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method
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Abstract
This paper describes the friction characteristics of a 1.8 Litre J-car piston and ring assembly as influenced by oil rings of conventional design, but of varying tensions. In addition, the piston-ring assembly friction characteristics are reported for a set of oil viscosities ranging from 2 to 20 cSt with and without a molybdenum friction modifier. Multigrade oil results are shown also. Finally comparisons are presented between changes in friction measured by the Instantaneous IMEP Method and those measured by the dynamometer for the engine as a whole.
Our results show large differences in piston-ring assembly friction as oil ring tension was varied. However, these differences became moderate after the oil ring broke-in. Both high and low oil viscosities increased piston and ring assembly friction. The friction modifier was most effective with a mid-range viscosity and provided virtually no benefit at viscosity extremes. The Instantaneous ÎMEP Method correlated well with dynamometer values under motoring conditions. The correlation under firing was relatively poor.
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Uras, H. and Patterson, D., "Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method," SAE Technical Paper 850440, 1985, https://doi.org/10.4271/850440.Also In
References
- Uras, H. M. Patterson, D. J. “ Measurement of Piston and Ring Assembly Friction Instantaneous IMEP Method ,” SAE Paper No: 830416 1983
- Uras, H. Mehmet “ A Study of Piston-Ring Assembly Friction ,” Ph.D. Theses The University of Michigan 1984
- Uras, H. Mehmet Patterson, D. J. “ Effect of Some Lubricant and Engine Variables on Instantaneous Piston and Ring Assembly Friction ,” SAE Paper No: 840178 1984