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Intake Valve Sticking in Some Carburetor Engines
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English
Abstract
Intake valve sticking, created by the accumulation of deposits on the valve stems, caused cold starting problems and engine failures at low temperatures (below + 5°C). Sticking was promoted by the high olefin content in gasoline (over 25% FIA). Sticking did not occur if gasoline contained no detergent additives. Some additives even led to sticking while some solved the problem. Engine oils containing polymeric additives promoted sticking.
Clearances of intake valve stems and stem seals were probably factors affecting sticking. Tests were made using cars on the road on an urban driving cycle.
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Authors
Citation
Mikkonen, S., Karlsson, R., and Kivi, J., "Intake Valve Sticking in Some Carburetor Engines," SAE Technical Paper 881643, 1988, https://doi.org/10.4271/881643.Also In
References
- Swain M. R. Swain M. N. Blanco J. A. Adt R. R. The Effect of Alternative Gasolines on Knock and Intake Valve Sticking SAE Technical Paper Series 872040 Society of Automotive Engineers, Inc. U.S.A. 1987 13
- Jewitt C. H. Bostick G. L. Kersey V. L. Fuel Injector, Intake Valve, and Carburetor Detergency Performance of Gasoline Additives SAE Technical Paper Series 872114 Society of Automotive Engineers, Inc. U.S.A. 1987 9