The installation of a 1.2 litre direct injected stratified charge spark ignited two cycle engine in a medium size Australian car realized an on road fuel consumption benefit of 27 per cent when compared with the standard 1984 1.6 litre carburetted four cycle engine. The benefit was achieved over the as 2077 city driving cycle, whilst complying with adr 27a emission levels. More significantly, when compared to the current 1986 1.8 litre throttle body injected four cycle engine, the same 27 per cent fuel consumption benefit was realized whilst meeting adr 37 emission levels. No alterations were made to the drivetrain hardware other than replacing the engine and fuel system. The prototype two cycle power plant employed the orbital combustion process (ocp), which uses electronic management of orbital pneumatically assisted in cylinder fuel injectors. Although being only 50 per cent of the size and mass of the original engine, the two cycle unit delivered an equivalent power output and returned similar vehicle acceleration figures as the standard vehicle. Improved transient response and driveability was due to the improved mixture preparation and load response of the in cylinder fuel injection system. Unit engine costs are anticipated to be 25 per cent less than an equivalent four cycle engine due to the reduced complexity of the two cycle construction and the implementation of advanced manufacturing techniques. Vehicle configurations under development are currently meeting US emission levels and are expected to achieve commercially viable levels by the end of 1986, whilst still showing major fuel consumption benefits (a).

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  • Corporate Authors:

    Australia Department of Resources and Energy

    GPO Box 858
    Canberra, ACT,   Australia 
  • Authors:
    • Davis, R M
    • Schlunke, K C
  • Publication Date: 1986-6

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Filing Info

  • Accession Number: 00499456
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0-642-08248-0
  • Files: ITRD, TRIS, ATRI
  • Created Date: Sep 30 1990 12:00AM