In addition to the use of volatile primers to provide methanol fuels with good cold starting characteristics, an additional component is needed for luminosity of methanol flames. Methanol fuels have been prepared with several volatile primers to provide improved cold starting characteristics. Dimethyl ether, which can be readily made from methanol, appears to be superior in several respects to other primers because it imparts adequate volatility at reasonably low concentrations and can tolerate water contamination without volatility changes or phase separation better than hydrocarbon primers. Hydrocarbon components have been identified that provide adequate luminosity to methanol fuel flames. Estimates of vapor flammability indicate that dimethyl ether primed methanol fuels can be made whose vapor is too rich to burn in confined tankage at least down to minus 20 deg C. The upper flammability temperature of isopentane primed methanol can be close to that of gasoline (minus 30 deg C), but the isopentane solutions are sensitive to water contamination. Primed methanol experiences greater volatility loss than gasoline during storage and use in vehicle tanks and carburetors. Greater evaporative emissions were also observed. Primers in the concentration range 0-15 volume percent appear to have no effect on octane quality in the CFR engine. Dimethyl ether seems not to aggravate methanol's preignition tendency.

  • Availability:
  • Supplemental Notes:
    • Reprinted from SP-559 Alternate Fuels for Spark Ignition Engines. Fuels and Lubricants Meeting San Francisco, California, October 31-November 3, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Panzer, J
  • Publication Date: 1983

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00387438
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 831687 Reprint, HS-036 795
  • Files: HSL, USDOT
  • Created Date: Aug 30 1984 12:00AM