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METHANOL-GASOLINE BLENDS PERFORMANCE IN LABORATORY TESTS AND IN VEHICLES
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Abstract
Blends of up to 20% methanol in gasoline were evaluated in both engine dynamometer and controlled vehicle tests, and in a 50,000 mile road test. Performance comparisons between methanol blends and base gasolines were made in vehicle driveability and vapor lock tendency, engine deposits and wear, fuel economy, exhaust emissions, compatibility with fuel system materials, and phase stability of the blends. Vapor lock tests in six 1974 cars strongly suggested that the vapor lock tendency of methanol blends is greater than would be predicted for gasolines having the same volatility characteristics. Cold start and warm-up driveability of two 1974 cars at 70°F depreciated as methanol concentration increased in base fuels of three volatility levels. These driveability data were found to correlate well, at a given methanol concentration, with fuel volatility characteristics described by means of a new fuel vaporization pressure technique. Engine deposits, rusting, wear and crankcase oil performance were not significantly affected by methanol in gasoline when evaluated in four laboratory engine tests and in the four-car, 50,000 mile road test Fuel consumption was found generally to increase with increasing methanol concentration, while exhaust emissions from both vehicles and stationary engines varied as expected from the stoichiometric air/fuel ratio of the blends. With the possible exception of copper and brass, screening tests with methanol blends indicated no serious potential compatibility problems with the fuel system metals tested or with Buna N or Neoprene rubbers. Methanol solubility in gasoline was shown to be increased by co-solvent alcohols. These also increased the stability of blends to phase separation by added water, but still phase separation occurred with as little as 0.1 or 0.2% of water.
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Citation
Crowley, A., Kuebrich, J., Roberts, M., Koehl, W. et al., "METHANOL-GASOLINE BLENDS PERFORMANCE IN LABORATORY TESTS AND IN VEHICLES," SAE Technical Paper 750419, 1975, https://doi.org/10.4271/750419.Also In
References
- Harrington, J. A. Pilot, R. M. “The Combustion and Emission Characteristics of Methanol,” SAE Paper No. 750420 February 1975
- Stull, D. R. Westrum, E. F. Sinke, G. C. “The Chemical Thermodynamics of Organic Compounds,” John Wiley & Sons, Inc. 1969
- “Selected Properties of Hydrocarbons and Related Compounds,” API Research Project 44 Texas A & M University College Station, Texas 1960 1962
- Calculated from “Mineral Industry Survey - Motor Gasoline,” U. S. Bureau of Mines 1973
- Eubank, P. T. “A Review of Volumetric, Thermodynamic, and other Physical Properties for Methanol,” American Inst. Chem. Engr. Symp. Series No. 98 66 “Methanol Technology and Economics,” Danner, G. A. 1970 16
- “Use of Alcohol in Motor Gasoline - A Review,” August 1971
- Lucas, H. J. “Organic Chemistry,” American Book Company Second 1953 28
- Timmermans, J. “Physico-Chemical Constants of Binary Systems in Concentrated Solutions,” Interscience Publishers New York 1959
- Wigg, E. E. Lunt, R. S. “Methanol as a Gasoline Extender - Fuel Economy, Emissions and High Temperature Driveability,” SAE Paper No. 741008 1974
- “1966 CRC Vapor Lock Tests,” Coordinating Research Council, Inc. New York 1966
- “Driveability Evaluation in Cool Weather,” Coordinating Research Council, Inc. New York December 1970
- A.S.T.M. Special Technical Publication 315F American Society for Testing and Materials Philadelphia, Pa. January 1973
- Method 3405.1, Federal Test Method Standard No. 791
- Federal Register 37 221 November 15 1972