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 nineteen companies on 391 1988 vehicles including passenger cars and light-duty trucks and vans, of which 155 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 1988 vehicle model production and/or sales figures. The maximum octane number requirements of 1988 models with average sensitivity unleaded fuels were 84.7 (R+M)/2 octane numbers at the 50 percent satisfaction level, and 89.3 (R+M)/2 octane numbers at the 90 percent satisfaction level. Comparison with previous surveys are made in this report.

  • Corporate Authors:

    Coordinating Research Council, Incorporated

    219 Perimeter Center Parkway
    Atlanta, GA  United States  30346
  • Publication Date: 1989-8

Media Info

  • Pagination: 165 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00494293
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CRC-566
  • Files: TRIS
  • Created Date: May 31 1990 12:00AM