CRC fuel rating program: road octane performance of oxygenates in 1982 model cars

Technical Report · Mon Jul 01 04:00:00 EDT 1985

OSTI ID:6142036

Because of the widespread interest in the use of alcohols and ethers as gasoline blending components, this program was conducted to evaluate the effects of several oxygenates on gasoline octane performance and to evaluate the effects of car design features such as engine and transmission type. Five oxygenates were evaluated at two nominal concentrations, 5 and 10 volume%, at both regular- and premium-grade octane levels: methanol (MeOH), ethanol (ETOH), isopropanol (IPA), tertiary butanol (TBA), and methyl tertiary butyl ether (MTBE). A blend of 5% MeOH and 5 percent TBA was also tested at both octane levels. Twenty-eight unleaded fuels, including four hydrocarbon fuels, two hydrocarbon fuels plus toluene, and twenty-two oxygenated fuels, were rated in duplicate in thirty-eight cars using the Modified Uniontown Technique (CRC Designation F-28-75 described in Appendix C), plus some additional instructions. All testing was done on chassis dynamometers. Ratings were obtained at full throttle with all thirty-eight cars, and at the most critical part-throttle condition (occurring with manifold vacuum of 4 in. Hg (13.5 kPa) or greater above the full-throttle vacuum) with nine cars.

• Research Organization: Coordinating Research Council, Inc., Atlanta, GA (USA)
• OSTI ID: 6142036
• Report Number(s): AD-A-159127/0/XAB; CRC-541
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
ADDITIVES
ALCOHOL FUELS
ALCOHOLS
ANTIKNOCK RATINGS
AUTOMOTIVE FUELS
BUTANOLS
ENERGY CONSUMPTION
ENGINES
ETHERS
EVALUATION
FUEL ADDITIVES
FUEL CONSUMPTION
FUELS
GASOHOL
GASOLINE
HEAT ENGINES
HYDROCARBONS
HYDROXY COMPOUNDS
INTERNAL COMBUSTION ENGINES
LIQUID FUELS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PROPANOLS
SYNTHETIC FUELS
UNLEADED GASOLINE