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Throttle Body Deposits - The CRC Carburetor Cleanliness Test Procedure
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English
Abstract
A nine-year effort from 1972 to 1981 was undertaken by the Coordinating Research Council Carburetor Test Procedure Panel to develop a laboratory engine test method for evaluating the effects of gasolines on the formation of throttle body deposits. This paper summarizes the test development, discusses effects of engine operating conditions on test severity, gives data on fuel effects, and presents a final test procedure that uses a removable carburetor throttle bore sleeve to permit weighing of deposits. A carburetor visual rating procedure was also developed. The final engine test procedure has proved to be an effective in-house tool for screening fuels and additives. An unresolved problem is poor interlaboratory reproducibility.
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Authors
Citation
Malakar, J., Retzloff, J., and Gibbs, L., "Throttle Body Deposits - The CRC Carburetor Cleanliness Test Procedure," SAE Technical Paper 831708, 1983, https://doi.org/10.4271/831708.Also In
References
- Sigworth H. W. Payne J. Q. “The Cause and Correction of Carburetor Gumming.” Paper 405 presented at SAE National Fuels and Lubricants Meeting Tulsa November 1954
- Fuchs E. J. “Laboratory Engine Method for Measurement of Detergency Effectiveness of Gasoline Additives on Carburetor Throttle Body Deposits,” Paper 379D presented at SAE Summer Meeting 1961
- Tandrup E. L. “Evaluating Carburetor Detergent Performance,” Paper 660782 presented at SAE Fuel and Lubricants Meeting Houston November 1966
- “Effect of Carburetor Deposits on Fuel Economy and Exhaust Emissions,” Report No. TS-193R, Ethyl Corporation April 1967
- Smith, R. G. Jr. Doelling R. P. “An Evaluation Technique for Gasoline Carburetor Detergents,” Paper 700669 presented at SAE National West Coast Meeting Los Angeles August 1970
- “Carburetor Cleanliness Test Procedure State-of-the-Art Summary Report: 1973-1981,” Report No. 529 Coordinating Research Council, Inc. Atlanta, Georgia April 1983
- Gibbs L. M. personal communication with Contra Costa County January 1983
- Gibbs L. M. Richardson C. E. “Carburetor Deposits and Their Control,” Paper 790202 presented at SAE Congress and Exposition Detroit February-March 1979