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Carburetter Foaming and Its Influence on the Hot Weather Performance of Motor Vehicles
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English
Abstract
A reappraisal of the hot fuel handling problems originating in the carburetter has been made. Experiments have been made using carburetters with transparent sections that enabled the behaviour of the fuel in the float bowl to be filmed during various modes of engine operation. Under certain well-defined conditions of temperature, fuel pressure at the carburetter inlet and fuel composition, the occurrence of engine malfunctions coincided with the presence of gross amounts of fuel foam in the carburetter bowl. This interfered with the normal operation of the system and led to the expulsion of a large quantity of fuel through the carburetter vent and, because the vent was blocked by the foam, caused an overpressure to develop in the bowl. These events created an excessive enrichment of the mixture aspirated by the engine and caused severe driveability problems, which were very similar to those associated with the fuel starvation caused by vapour lock.
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Citation
Tertois, V. and Caddock, B., "Carburetter Foaming and Its Influence on the Hot Weather Performance of Motor Vehicles," SAE Technical Paper 821202, 1982, https://doi.org/10.4271/821202.Also In
References
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- Caddock, B.D. Orman P.L. Pearson, J.K. “A Computer Model for Prediction of Vapour Lock in the Fuel Pump of a Carburetted Engine” SAE Paper No. 821201 1982
- Yokoyama, H. Nakajima, K. Uchinuma, K. “The Effects of Gasoline Volatility on Percolation of Automobiles” Bull. Jap. Pet. Inst. 9 58 1967
- Date, T. Nomura, T. Toyada, Y. “Fuel Supply Characteristics of CVCC Carburetter to the Auxiliary Combustion Chamber” Paper C399/80, Instn. Mech. Engrs. Conference on Stratified Charge Automotive Engines 1980
- Palmer, F.H. “The Development of CEC Driveability Test Procedures for European Vehicles and Fuels” SAE Paper No. 811230 1981