INCREASED BURNING RATES OFFER IMPROVED FUEL ECONOMY-NOX EMISSIONS TRADE-OFFS IN SPARK-IGNITION ENGINES

Mass burning rate was varied by using two single-cylinder engines, each fitted with different combustion-chamber geometries. The slower-burning chamber incorporated a side-mounted spark plug, the faster-burning chamber combined a more compact combustion space and a centrally located spark plug. The faster-burning engine exhibited an improved efficiency-NOx emissions trade-off, primarily due to the engine's higher maximum thermal efficiency and greater tolerance to charge dilution by recirculated exhaust gas. Faster burning also reduced cyclic variability in combustion, increased the knock-limited thermal efficiency, but offered no advantage in regard to hydrocarbon emissions.

  • Supplemental Notes:
    • Prepared for SAE Meeting, 26 February-2 March, 1979.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Tuttle, J H
    • Toepel, R R
  • Publication Date: 1979

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00301521
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 790388
  • Files: TRIS
  • Created Date: Nov 7 1979 12:00AM