This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
European Valve Train Wear-Some Experience With the Volvo B20 Test
Annotation ability available
Sector:
Language:
English
Abstract
Valve train wear performance of crankcase oils and their components has been evaluated in 20-hour Volvo 2 litre engine tests. Results show that specifying a minimum zinc level in an oil does not necessarily assure freedom from cam and tappet wear. The interference effect of the detergent inhibitor package (DI) on the functioning of the anti-wear additive is clearly demonstrated. Case studies of lubricants at performance levels ranging from API SC-CB to SE and CD highlighted the effects of viscosity index improvers (VII) oil quality variation, tappet surface treatment, effectiveness of various zinc dialkyldithiophosphate agents (ZDDP) and failure mechanisms. Test procedure investigations were conducted to evaluate the precision of the method, the effect of cycle time on the failure rate and test engine life.
Recommended Content
Authors
Citation
Slater, B., "European Valve Train Wear-Some Experience With the Volvo B20 Test," SAE Technical Paper 750866, 1975, https://doi.org/10.4271/750866.Also In
References
- “Cams and Tappets: A Survey of Information” British Technical Council of the Motor and Petroleum Industries 1972
- Volvo Test Code 220. 01B Volvo 1964 1971
- Roberts D.C. Wykes F.C. “Standard test for cams and followers” Journal of Automotive Engineers March 1972
- Volvo reference oil standard 97361 1972
- Volvo Report LM 16120 1966
- Chitty D.B. “A Rig Test Approach to the Investigation of Valve Train Failures in Automotive Engines” Performance Testing of Lubricants for Automotive Engines and Transmissions Montreux, Switzerland 2-6 April 1973
- Wykes F.C. “Surface Deterioration of Cams and Cam Followers” The Motor Industry Research Association
- Löfgren S.O. “Volvo Cam & Tappet Wear Test Program” Volvo Report No. 6515-123 1974