EFFECT OF COMPRESSION RATIO ON EXHAUST EMISSIONS AND PERFORMANCE OF A METHANOL-FUELED SINGLE-CYLINDER ENGINE

To evaluate compromises between engine efficiency and exhaust emissions, a methanol-fueled single-cylinder engine was run at CR's from 8 to 18. Increasing CR from 8 to 18 while maintaining MBT spark timing increased efficiency about 16 percent, but also increased NO sub x and unburned fuel (UBF) emissions. Some previous studied have reported decreased NO sub emissions with increased CR, possibly because MBT spark timing was not maintained. Results of this study indicate that constant NO sub x emissions can be maintained by retarding spark timing while increasing CR to improve efficiency. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Brinkman, N D
• Publication Date: 1977-9

Media Info

• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Compression; Economic efficiency; Evaluation; Exhaust gases; Methanol; Nitric oxide; Nitrogen oxides; Spark ignition engines; Vehicle performance; Vehicle power plants
• Uncontrolled Terms: Cylinders; Efficiency
• Old TRIS Terms: Automobile engines; Compression ratio
• Subject Areas: Economics; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00172079
• Record Type: Publication
• Report/Paper Numbers: SAE 770791
• Files: TRIS
• Created Date: Mar 29 1978 12:00AM