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Fuel Volatility Effects on Driveability of Vehicles Equipped with Current and Advanced Fuel Management Systems
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English
Abstract
Fuel volatility and cold/hot engine driveability relationships were evaluated in six 1976/1977 model cars representing conventional carburetor and advanced type fuel metering systems. The program objective was to provide guidance for engine modifications to take advantage of fuel benefits or to overcome performance deficiencies. There were large variations among cars in the maximum volatility tolerance relative to vapor lock during summer, hot engine operation, with a fuel-injected and a new design carburetor system tolerating gasoline volatility levels in excess of normal maximum summer levels. Similarly, cold engine start and driveaway performance at low and intermediate ambient conditions varied widely. Fuel-injected cars showed the best performance and least sensitivity to gasoline volatility changes. Performance differences among all cars with a specific fuel were significantly greater than differences resulting from typical variations of fuel volatility for individual cars. This shows that fuel systems can be designed to provide good overall driveability performance and wide tolerance in fuel volatility, permitting greater flexibility to produce unleaded gasoline.
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Citation
Morgan, C. and Smith, C., "Fuel Volatility Effects on Driveability of Vehicles Equipped with Current and Advanced Fuel Management Systems," SAE Technical Paper 780611, 1978, https://doi.org/10.4271/780611.Also In
References
- “Driveability Evaluation in Cool Weather,” Report No. 439, Coordinating Research Council December 1970
- “1972 CRC Intermediate Temperature Driveability Program--Paso Robles,” Report No. 483, Coordinating Research Council December 1975
- “Driveability Performance of 1975 Passenger Cars at Intermediate Ambient Temperatures--Paso Robles,” Report No. 486, Coordinating Research Council May 1976
- “Driveability Performance of 1975 Passenger Cars at High Ambient Temperatures,” Report No. 490, Coordinating Research Council November 1976
- Horowitz A. M. Wascher W. L. “Cold Weather Driveability Performance of Late Model Cars,” Paper 740520 SAE Fleet Week '74 Chicago, Illinois June 1974