Audi NSU has developed a new rotary engine (KKM 871) which utilizes a lean burn concept with fuel injection and an exhaust emission control system employing a catalytic converter. Test results indicate that the fuel economy ranges at the same level as comparable reciprocating engines. Although base emissions levels are still too high, these levels could be reduced with the further development of the engine to enable compliance with U.S. standards (even after a driving distance of 50,000 miles). The rotary engine proved to be quieter than the reciprocating engine over most of the range of engine speeds. Results of comprehensive tests concerning the durability of the Audi rotary engine indicate that no difficulties are to be expected in customer usage. The service life of the rotary engine would appear to correspond with that of the reciprocating engine. In addition, development projects incorporating a stratified charge system within the basic KKM 871 design indicate that this engine, if somewhat modified, is also suitable for other combustion processes. Modifications of the KKM 871 to achieve stratified charge are described, including partial and full direct injection.

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  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Basshuysen, R van
    • Wilmers, G
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00395867
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780418, HS-025 479U
  • Files: HSL, USDOT
  • Created Date: Jul 31 1985 12:00AM