This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Cam and Lifter Wear as Affected by Engine Oil ZDP Concentration and Type
Annotation ability available
Sector:
Language:
English
Abstract
The recent increase in excessive camshaft and lifter wear after extended service has shown that some SE-quality engine oils do not provide adequate protection.
To determine the effects of oil additives on wear, controlled tests were run using 1972-1974 model cars, unleaded gasoline, and either SE commercial products or experimental formulations. Field experience with 1970-1975 model trucks, leaded gasoline, and SE/CC or SE/CD oils was also investigated.
With some commercial oils, in both controlled tests and field experience, excessive wear sometimes occurred after extended service, even with recommended oil-change intervals. Generally, protection from excessive wear was best provided by those oils containing pre-dominantly alkyl ZDP (zinc dithiophosphate) antiwear additive instead of aryl ZDP. These results show that a laboratory engine test is needed to evaluate the long-term wear protection of engine oils.
Recommended Content
| Technical Paper | How Much ZDP is Enough? |
| Technical Paper | Laboratory Evaluation of Detergent Additives for Engine Oils |
| Technical Paper | A Study on Cam Wear Mechanism with a Newly Developed Friction Measurement Apparatus |
Authors
Citation
Pless, L. and Rodgers, J., "Cam and Lifter Wear as Affected by Engine Oil ZDP Concentration and Type," SAE Technical Paper 770087, 1977, https://doi.org/10.4271/770087.Also In
References
- SAE Recommended Practice, Engine Oil Performance and Engine Service Classification - SAE J183a SAE Handbook
- Final Report of the Ad Hoc Wear Panel Section I, Technical Division B, American Society for Testing and Materials Philadelphia February 6 1976
- “Engine Wear” Society of Automotive Engineers Warrendale, Pennsylvania April 19 1976
- Pless, L. G. “A Study of Lengthened Engine Oil-Change Intervals,” SAE Transactions 83 1974 paper 740139
- Miles D. L. Faix L. J. Lyon H. H. Niepoth G. W. “Catalytic Emission Control System Field Test Program,” SAE Transactions 84 1975 paper 750179
- Kopa R. D. Kimura H. “Exhaust Gas Recirculation as a Method of Nitrogen Oxides Control in an Internal Combustion Engine,” Air Pollution Control Association 53rd Annual Meeting Cincinnati May 1960
- Bennett P. A. Murphy C. K. Jackson M. W. Randall R. A. “Reduction in Air Pollution by Control of Emission from Automotive Crankcases,” SAE Transactions 68 1960 514
- Pless L. G. “Effects of Some Engine, Fuel, and Oil Parameters on Engine Rusting in Short-Trip Service,” Proceedings of “Performance Testing of Lubricants for Automotive Engines and Transmissions,” April 1973 London Applied Science Publishers Ltd. 1974
- Pless L. G. “Deposits, Wear, and Catalyst Performance with Low Ash and Ashless Engine Oils,” SAE Transactions 84 1975 750900
- Waddey W. E. Pearce A. F. “Effects of Motor Oil Composition on Engine Wear,” paper 690774 SAE National Fuels and Lubricants Meeting Houston November 1969
- Pless L. G. “Interactions Among Oil Additives and Engine Operating Parameters Affecting Engine Deposits and Wear,” SAE Transactions 81 1972 paper 720686
- Pless L. G. “Deposits, Wear, and Catalyst Performance with Low Ash and Ashless Engine Oils,” SAE Transactions 84 1975 2480