Practical methods of reducing a “Diesel Sounding Knock” at idle conditions, in a 4 cylinder, 2.2 liter, gasoline engine were investigated. A peak noise averaging method was used to determine the effect of accumulated mileage and sensitivity to various friction modifiers and lubricants. Piston parameters were also optimized and, with a friction modifier, produced a 10 dB average peak noise level reduction. Data relating the average peak noise levels to accumulated mileage and percent concentration of a friction modifier were obtained and time history recordings documenting the peak noise level changes were made. The results of the testing confirm published findings on “Diesel Sounding Knock” and support a “Piston Stick Slip” theory as the noise generation mechanism.


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    Title :

    Control of ‘Piston Stick Slip Noise’ in a 4-Cylinder Gasoline Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE Noise and Vibration Conference and Exposition ; 1987



    Publication date :

    1987-04-28




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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