A STUDY OF ONE GASOLINE-FUELED ENGINE LINE COMPARING EMISSION RESULTS BETWEEN 1969 ENGINES AND 1979 ENGINES ON THREE TEST PROCEDURES: THE HEAVY-DUTY TRANSIENT ENGINE TEST, THE HEAVY-DUTY 9-MODE ENGINE TEST, AND THE LIGHT-DUTY TRUCK CHASSIS TEST

The 1977 Amendments to the Clean Air Act mandated EPA to set new emission standards for heavy-duty (HD) vehicles or engines for model years 1983 and 1985. These new standards were to represent a percentage reduction "from the average of the actually measured emission from heavy-duty gasoline-fueled vehicles or engines...manufactured during the baseline model year." EPA has initiated a testing program to determine the baseline emission levels. The testing program includes multiple transient tests on each baseline engine, during which emissions are measured by the critical flow venturi constant volume sample CFS-CVS technique. Additional testing on each engine includes the current 9-mode certification procedure modified to use the CVS bag procedure.

  • Corporate Authors:

    Environmental Protection Agency

    Standards Development & Support Branch, 2565 Plymouth Road
    Ann Arbor, MI  USA  48105
  • Authors:
    • CLEMMENS, W B
    • Cox, T P
  • Publication Date: 1979-7

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00313874
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA-AA-SDSB-79-16 Tech Rpt.
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM