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Hot-Start Driveability of Low T 50 Fuels
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English
Abstract
A two-phase test program designed to investigate the effects of Reid vapor pressure, T50, and oxygenates on hot-start and driveability performance of vehicles operated at high and low altitude in high and intermediate ambient temperature ranges was conducted during July and August of 1992. Twenty 1983 - 1992 model-year vehicles were tested on a set of eighteen fuels which included six hydrocarbon-only fuels, six gasoline-ethanol blends, and six gasoline-MTBE blends. Fuel-injected vehicles showed very few demerits and were insensitive, in most cases, to the fuel variables studied. By comparison, carbureted vehicle's demerit levels were three times the level associated with fuel injected vehicles. Statistically significant degradation of driveability was demonstrated in these vehicles when tested on fuels with low T50 and low RVP. Driveability problems related to low T50 fuels were frequently symptomatic of vapor lock. In carbureted vehicles using high-RVP fuel at high altitudes, gasoline-oxygenate blends showed significantly improved driveability relative to pure hydrocarbon fuels. The effect of ambient temperature was greater than that of any other variable.
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Jorgensen, S. and Reuter, R., "Hot-Start Driveability of Low T50 Fuels," SAE Technical Paper 932672, 1993, https://doi.org/10.4271/932672.Also In
References
- Federal Register October 20 1992 47,849 47,853 47,769
- Annual Book of ASTM Standards , Designation D4814-92 1992 American Society for Testing and Materials 1916 Race St., Philadelphia, PA 19103
- Effects of RVP, T 50 , and Oxygenates on Hot-Start and Driveability Performance at High and Low Altitude CRC Report No. 584 Coordinating Research Council May 1993
- The Coordinating Research Council Suite 400, 219 Perimeter Center Parkway, Atlanta, Georgia 30346
- SAS ® Statistical System SAS Institute Inc. Box 8000 Cary, North Carolina 27511-8000