THE EFFECTS OF COMBUSTION CHAMBER DESIGN AND COMPRESSION RATIO ON EMISSIONS, FUEL ECONOMY AND OCTANE NUMBER REQUIREMENT

Four combustion chamber designs and three compression ratios (8:1, 9:1 and 10:1) were investigated for their emission, fuel economy, and octane number requirement characteristics using a 1.6 liter (96.9 CID) 4 cylinder engine. The "High Turbulence Type" combustion chambers, which included swirl (piston swirl) and/or squish, indicated better fuel economy under emission and octane number requirement constraints. Teh HC emission of the combustion chamber with squish and swirl was lower than that of the combustion chambers with squish alone. The time resolved measurement of HC emissions expained the difference in the exhaust process of these unburned hydrocarbons. A compression ratio of 9:1 was the best compromise for optimum fuel economy. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • MATSUMOTO, K
  • Inoue, T
• Publication Date: 1977

Media Info

• Pagination: 39 p.

Subject/Index Terms

• TRT Terms: Combustion chambers; Compression; Design; Engines; Exhaust gases; Fuel consumption; Hydrocarbons; Octane number
• Old TRIS Terms: Compression ratio; Octane rating
• Subject Areas: Design; Energy; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00158295
• Record Type: Publication
• Report/Paper Numbers: SAE 770193
• Files: TRIS
• Created Date: Dec 8 1977 12:00AM