1985 CRC Octane Number Requirement Survey.
COORDINATING RESEARCH COUNCIL INC ATLANTA GA
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In the thirty-ninth annual statistical survey of current model vehicles conducted by the Coordinating Research Council, Inc., test data were obtained on 374 1985 model vehicles, including 309 US vehicles and 65 imported vehicles. Fifteen laboratories participated in this Survey. Maximum octane number requirements were determined by testing under part-throttle conditions, as well as at maximum-throttle. Requirements are expressed as the RM2 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. The primary analyses used in this report are based upon RM2 octane number requirements, rather than upon Research octane number requirements as in previous reports. Estimated octane number requirements for the US vehicles are weighted in proportion to the 1985 vehicle model production figures and, for the imported models, in proportion to import sales volume in the United States.