1991 CRC Octane Number Requirement Survey
Abstract
An annual statistical survey of octane number requirements of current model vehicles is conducted by the Coordinating Research Council, Inc. Test data have been obtained by fifteen companies on 262 1991 vehicles including passenger cars and light-duty trucks an vans, of which 105 were equipped with knock sensors. Octane number requirements were determined by testing at maximum- throttle conditions, as well as at part-throttle, with four unleaded fuel series of varying sensitivities, one containing 15 percent methyl tertiary butyl ether. Requirements are expressed as the (R+M)/2 octane number, Research octane number, and Motor octane number of the reference fuel producing knock which was recurrent and repeatable at the lowest audible level. Estimated octane number requirements for the total vehicles are weighted in proportion to the 1991 vehicle model production and/or sales figures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1992
- Accession Number
- ADA259821