VARIABLE-DISPLACEMENT SPARK-IGNITION ENGINE. FINAL REPORT

A five-cylinder variable displacement research engine was designed, built, and tested. Displacement is varied by changing the piston stroke using a four-bar linkage. Before the engine was built, its dynamics were thoroughly analyzed, and a five-cylinder configuration was selected to minimize vibration. Test data show that BSFC is, as expected, less dependent on load than in conventional engines, and averages less than 0.5 lb/bhp-hr over the load and speed range of ordinary automobile operation. The impact of exhaust gas recirculation on emissions levels was studied experimentally. Several methods for estimating urban fuel economy from dynamometer data predict a 20 to 25% improvement compared with conventional engines at the same emissions levels. (ERA citation 03:044973)

  • Corporate Authors:

    SANDIA LABORATORIES

    ALBUQUERQUE, NM  United States 

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Pouliot, H N
    • Robinson, C W
    • Delameter, W R
  • Publication Date: 1978-5

Media Info

  • Pagination: 102 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00186801
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: EY-76-C-04-0789
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM