The 1979 U.S. EPA emission standards on larger-sized two-stroke cycle engine motorcycles were very strict. This paper discusses the butterfly exhaust valve system installed on the YAMAHA RD400 Daytona Special which is the only two-stroke cycle engine motorcycle in the controlled 400cc class.The paper also refers to the structure of the valve system and the principle of valve operation as well as its effects on reducing exhaust emissions, improving brake specific fuel consumption, and increasing engine power at part-throttle.In addition, the butterfly exhaust valve system has a great effect on reducing engine surge due to the cyclic variations in combustion inherent in two-stroke cycle engines. The reduction ratio of engine surge is expressed quantitatively in our unique method. The above effects were investigated by means of exhaust gas velocity measurements and by analysis of combustion pressure.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Emission Control of Two-Stroke Motorcycle Engines by the Butterfly Exhaust Valve


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Tsuchiya, Katsuhiko (Autor:in) / Okamura, Makoto (Autor:in) / Hirano, Seiji (Autor:in) / Gotoh, Tohru (Autor:in)

    Kongress:

    1980 SAE International Off-Highway and Powerplant Congress and Exposition ; 1980



    Erscheinungsdatum :

    01.09.1980




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Emission Control of Two-Stroke Motorcycle Engines by the Butterfly Exhaust Valve

    Tsuchiya,K. / Hirano,S. / Okamura,M. et al. | Kraftfahrwesen | 1980


    Exhaust emission control method for four-stroke motorcycle engines

    Inoue, K. / Ohtani, J. / Nakano, Y. | Tema Archiv | 1978


    Exhaust control system for motorcycle 4-stroke engines.

    Yamabe,K. / Ueda,H. / Yamaha Motor,JP | Kraftfahrwesen | 1989


    Exhaust Control System for Motorcycle 4-Stroke Engines

    Ueda, Hideaki / Yamabe, Kiyotaka | SAE Technical Papers | 1988


    Exhaust control system for motorcycle 4-stroke engines

    Yamabe,K. / Ueda,H. / Yamaha Motor,JP | Kraftfahrwesen | 1988