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 17 companies on 356 1990 vehicles including passenger cars and light-duty trucks and vans, of which 169 were equipped with knock sensors. Octane number requirements were determined by testing at maximum-throttle conditions, as well as at part-throttle, with three unleaded fuel series with 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 requirements for the total vehicles are weighted in proportion to the 1990 vehicle model production and/or sales figures. The octane number requirements of 1990 models with average sensitivity unleaded fuels were 85.4 (R+M)/2 octane numbers at the 50 % satisfaction level, and 89.2 (R+M)/2 octane numbers at the 90% satisfaction level.

  • Corporate Authors:

    Coordinating Research Council, Incorporated

    219 Perimeter Center Parkway
    Atlanta, GA  United States  30346
  • Publication Date: 1991-7

Media Info

  • Pagination: 143 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00623259
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CRC-575
  • Files: TRIS
  • Created Date: Jul 31 1992 12:00AM