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Vapor Lock in Late Model Cars
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English
Abstract
Twenty cars of the model years 1978 to 1982 were tested for their vapor lock characteristics using the CRC Vapor Lock Procedures. These cars represent the more popular combinations of models/engines for the included years. The tests were run at 70F, 85F, and 100F to cover the normal range of maximum temperatures at which vapor lock problems occur. The gasoline blends used in the test program were also compositionally varied to include both fuels pressurized by butane and those pressurized by isopentane.
Results of this study show late model cars generally to be more able to handle hot fuels without experiencing vapor lock than vehicles of the mid-1960s, the latest vehicles for which comparable data were available. The results also suggest that some revision to the volatility classes in ASTM D-439 Standard Specification for Automotive Gasoline should be considered. In particular, the large jumps in volatility at different ambient temperatures allowed under ASTM D-439 do not match the changes in fleet vapor lock sensitivity to ambient temperature. Additional volatility classes would allow a better matching of fuels to vehicle needs.
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Authors
Citation
Riley, R., "Vapor Lock in Late Model Cars," SAE Technical Paper 831707, 1983, https://doi.org/10.4271/831707.Also In
References
- “1964 CRC Vapor Lock Tests” CRC Report No. 386 July 1965
- “1966 CRC Vapor Lock Tests” CRC Report No. 420 November 1968
- “Evaluation of High Temperature Drive-ability Test Procedure-1971 Yuma Program” CRC Report No. 455 June 1973
- “Driveability Performance of 1975 Passenger Cars at High Ambient Temperatures” CRC Report No. 490 November 1976
- Clarke P. J. “Hot Weather Fuel Requirements of 1975-1980 Model Year Cars,” SAE Paper No. 811229 February 1981
- Clarke P. J. “Front End Volatility Requirements of Late Model Cars at Intermediate Ambient Temperatures,” SAE Paper No. 830595 March 1983
- Caddock B. D. Davies P. T. Evans A. W. Barker R. F. “The Hot-Fuel Handling Performance of European and Japanese Cars,” SAE Paper No. 780653 June 1978
- Becker R. F. Ciardiello U. Fitch F. B. Smith C. N. “Hot Weather Volatility Requirements of European Passenger Cars,” SAE Paper No. 780651 June 1978
- “Evaluation of Expressions for Fuel Volatility” CRC Project No. CM-60-65 January 1967
- 1983 Annual Book of ASTM Standards, Part 23 Petroleum Products and Lubricants
- 1983 Annual Book of ASTM Standards, Part 24 Petroleum Products and Lubricants
- Doner John P. “A Predictive Study for Defining Limiting Temperature and Their Applications in Petroleum Product Specifications” NTIS Report No. AD-756 420 November 1972
- “Correlation of Road and Chassis Dynamometer Vapor Lock Test Data,” CRC Project CM-43-61 October 1964