THE EFFECTS OF ENGINE VARIABLES AND EXHAUST GASE RECIRCULATION ON EMISSIONS, FUEL ECONOMY, AND KNOCK -- PART III

Steady-state engine mapping data were obtained from a 400 CID V-8 spark-ignition engine at compression ratios of 8.0 and 9.3:1 to determine the effect of compression ratio on fuel consumption and octane number requirement at various exhaust emission levels. The results indicate that increasing compression ratio from 8.0 to 9.3 decreases BSFC without changeing BSNOx emissions, but increases BSHC emissions. Additionally, when BSHC emissions are maintained at the constant levels considered in this study, the minimum BSFC decreases with increasing compression ratio and is obtained at A/F ratios of 16 to 18:1. Some possible explanations for these differences are presented. /GMRL/

  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Morgan, C R
    • Kirklin, P W
  • Publication Date: 1977

Media Info

  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158394
  • Record Type: Publication
  • Report/Paper Numbers: SAE 770192
  • Files: TRIS
  • Created Date: Dec 8 1977 12:00AM