This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Sludge and Deposit Control in Automotive Engines - Chemical Leads and Mechanism
Annotation ability available
Sector:
Language:
English
Abstract
Advances in Engine design such as fast-burn combustion and foul air ventilation have combined with higher blowby rates and smaller oil sumps to increase the sludge load on the lubricant. The nature of the sludge deposits has also changed from a soft to a significantly harder sludge. Progress has been made in understanding how oil-related deposits form in automotive engines. Engine deposits and used oil composition studies have supported the hypothesis that the oil's dispersant is rendered ineffective by greater interaction with the fuel blowby acids leading to increased and harder sludge deposits. Moreover, deposits/used oil analysis, using X-ray Photoelectron Spectroscopy (XPS), indicate that deposits precursors reside in the pentane insolubles of the used field engine oils. A bench test has been developed which simulates deposit formation in engines and which shows potential as a screener for the industry Sequence VE engine test. Compositional studies have substantiated a chemical connection between the sludge produced in the lab bench test with that encountered in field engines. These developments are discussed in greater detail and confirm the importance of oil composition on hard sludge formation.
Authors
Citation
Shaub, H. and Kelemen, S., "Sludge and Deposit Control in Automotive Engines - Chemical Leads and Mechanism," SAE Technical Paper 920857, 1992, https://doi.org/10.4271/920857.Also In
References
- Hanson J. B. Harris S. W. West C. T. “Factors Influencing Lubricant Performance in the Sequence VE Test” SAE Paper # 881581 Oct. 10-13 1988
- Lillswhite J. R. F. Sant P. Saville S. B. “Investigation of Sludge formation in Gasoline Engines” CEC Symp. Paris April 1989
- Nahumck W. M. Hyndman C.W. Cryvoff S. A. “Development of the PV-2 Engine Deposit and Wear Test - An ASTM Task Force Progress Report,” SAE Paper # 872123 November 2-5 1987
- Handbook of X-ray and Ultraviolet Photoelectron Spectroscopy Heyden and sons Ltd. 1978
- Handbook of X-ray Photoelectron Spectroscopy Perkin - Elmer Corp. Eden Praire, MN 1979
- Clark D. T. Wilson R. Fuel 62 1983 1034
- Perry D. L. Grint A. Fuel 62 1983 1029
- Wu M. M. Robbins G. A. Winschel G. A. Burk F. P. Energy and Fuels 2 1988 150
- Kelemen S. R. Freund H. Energy and Fuels 3 1989 498 4 1990 167
- Munro H. S. Allaker R. S. Polym. Reg. and Stab. 15 1986 367
- Lin S. S. Appi. Surf. Sci. 26 1986 461
- Barile K. D. Perry D. L. Wallace S. Fuel Process. Technol. 15 1987 351
- Burchill P. Welch L. S. Fuel 68 1989 100
- Kelemen S. R. George G.N. Gorbaty M. L. Fuel Process. Technol. 24 1990 425 Fuel 69 1990 939
- Thomas H. R. Ph.D Thesis, University of Durham U.K. 1977
- Gorbaty M. L. George G. N. Kelemen S. R. Fuel 69 1990 945
- ASTM Designation: D893-85 “Standard Test Method for Insolubles in Used Lubricating Oils ”
- Schilowitz A. M. Espino R. L. Don H. S. Tribol. Trans. 33 1990 193