One of two fleets tested in this study was operated for 50,000 miles on an EPA-type durability route. Certain of the cars, all 1977 models, use clear certification fuel while others use an additional 1/32 Mn/gallon or 1/16 Mn/gallon fuel additive. The average increase in HC, CO and NOx emissions was essentially the same for clear-fuel cars and MMT (methylcyclopentadienyl managanese tricarbonyl) cars, with deterioration rates being somewhat lower for the MMT cars. A second twenty car fleet was fueled half with clear fuel and half with 1/8 Mn/gallon. Engine-out data show only little differences in stabilized emission levels between the clear-fuel cars and the MMT cars, both before and after deposit removal. As-received tailpipe emission data showed a larger spread in individual car ratings, probably because of missing air-pump belts on some cars and other malfunctions of the air delivery system. Average tailpipe emissions after tune-up showed only small differences between the clear-fuel and MMT cars, with the difference in hydrocarbon emissions resulting from the abnormally high HC emissions of one MMT car.

  • Supplemental Notes:
    • Presented at the SAE meeting, February 27-March 3, 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Lenane, D L
  • Publication Date: 1978

Media Info

  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00180090
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 780003 Preprint
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM