A reduction of engine knock intensity is demonstrated by incorporation of a stepped piston top to provide an abrupt increase in flame front area in an ASTM-CFR octane rating engine. The conclusions are based on several different types of knock measurements. Three different piston designs were tested.Decreases in the knock intensity, the magnitude of the pressure oscillations following knock, of up to 40% were realized. The statistical nature of knock is shown to be somewhat different from a normal distribution. The data have more scatter, particularly toward the high side of the mean value.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Knock (Detonation) Control by Engine Combustion Chamber Shape


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1983



    Publication date :

    1983-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Knock ( detonation ) control by engine combustion chamber shape

    Benson,G. / Fletcher,E.A. / Murphy,T.E. et al. | Automotive engineering | 1983


    Combustion-Chamber Deposition and Knock

    Hall, C.A. / Hirschler, D.A. / Gibson, H.J. | SAE Technical Papers | 1953


    Combustion Knock in Pre-Chamber Diesels

    Troth, K. A. / Burt, R. | SAE Technical Papers | 1970



    Experimental simulation of engine knock by means of a preheated static combustion chamber

    Gabano,J.D. / Kageyama,T. / Fisson,F. et al. | Automotive engineering | 1988