Four technical studies and a marketing survey are analyzed to determine customer reaction to engine knock over a twenty year period. The data show that customer reaction has not changed materially during the period studied. Three of the technical studies concur in reporting that DELTA RON, the difference in Research Octane Number requirements between trained observers and customers, varied from 3.0 RON at the 50th percentile satisfaction level to 1. 7 RON at the 90th percentile satisfaction level. The marketing survey shows that these values of DELTA RON are a good measure of the number of customers in the marketplace who consider knock to be a problem. The fourth technical study measured DELTA RON to be at least twice as large as the values in the other studies, but this discrepancy is traced to the design of the questionnaire used to evaluate customer reaction to knock.

  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Corner, E S
    • Hochhauser, A M
    • Shannon, H F
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180107
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 780322 Preprint, HS-025 419U
  • Files: HSL, TRIS
  • Created Date: Oct 12 1985 12:00AM