The experimental details are described and the results are discussed of studies of octane requirement increase (ORI) which are the result of the use of unleaded fuel and catalytic converters. ORI was determined for 115 cars of the 1982 model year operated on unleaded gasoline. The mean ORI for the cars at 15,000 miles and with full-boiling range unleaded (FBRU) fuels as well as with full boiling range high sensitivity unleaded (FBRSU) fuels were determined. The ORI with primary reference fuels (PRF) was also determined. Compared with 1981 models, the mean ORI for all cars in the 1982 program with FBRU fuels was 0.2 lower on a RON (Research Octane Number) basis and 0.3 MON (Motor Octane Number) lower. In general, the mean ORI with FBRU fuel exhibits a slight downward trend for 1975 through 1982 model cars. ORI decreases about 0.3 to 0.4 octane number per octane number increase of initial requirements; this relationship is statistically significant.

  • Supplemental Notes:
    • Prepared by the 1982 Octane Requirement Increase Analysis, Panel of the CRC Light-Duty Octane Technology and Test Procedures Group (CRC Project CM-124-82).
  • Corporate Authors:

    Coordinating Research Council, Incorporated

    219 Perimeter Center Parkway
    Atlanta, GA  United States  30346
  • Publication Date: 1984-9

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: v.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00395961
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: CRC 540, HS-038 166
  • Files: HSL, TRIS, USDOT
  • Created Date: Jul 31 1985 12:00AM