Oil and Ring Effects on Piston-Ring Assembly Friction by the Instantaneous IMEP Method The University of Michigan Ann, Arbor, MI

Format:

Conference/Event

Author/Creator:

Uras, H. Mehmet, author.

Conference Name:

SAE International Congress & Exposition (1985-02-25 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1985

Summary:

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-inches 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

Notes:

Vendor supplied data

Publisher Number:

850440

Access Restriction:

Restricted for use by site license