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 eighteen companies on 391 1989 vehicles including passenger cars and light-duty trucks and vans, of which 179 were equipped with knock sensors. Maximum octane number requirements were determined by testing at maximum-throttle conditions, as well as at part-throttle, with three unleaded fuel series of varying sensitivities. 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 1989 vehicle model production and/or sales figures. The maximum octane number requirements of 1989 models with average sensitivity unleaded fuels were 85.1 (R+M)/2 octane numbers at the 50 percent satisfaction level, and 89.2 (R+M)/2 octane numbers at the 90 percent satisfaction level. Comparison with previous Surveys are made in this report. (js)
CRC Octane Number Requirement Survey for 1989
1990
198 pages
Report
No indication
English
Fuels , Road Transportation , Detectors , Experimental data , Fuel additives , Hearing , Models , Passenger vehicles , Sensitivity , Statistics , Surveys , Trucks , Vans , Vehicles , Automotive fuels
Octane number requirement survey, 1962
Engineering Index Backfile | 1962
CRC Octane Number Requirement Survey, 1991
NTIS | 1992
1980 CRC Octane Number Requirement Survey
NTIS | 1981
CRC Octane Number Requirement Survey 1990
NTIS | 1991
1981 CRC Octane Number Requirement Survey
NTIS | 1982