Data are presented which describe the rate of engine adjustment and exhaust emission deterioration with time and mileage. Three classes of vehicles are described which include pre 1966 cars without exhaust emission controls, 1966-1970 cars with HC and CO exhaust controls and post 1970 cars that are equipped to control HC, CO and NOx. The results of additional experiments to determine the repeatability of emissions measurements and the effect of cold soak temperature upon measured exhaust emission are also presented. Mass emission measurements were made using the 1972 Federal Test Procedure and concentration measurements were made in selected engine operating modes.


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    Title :

    A Study of Mandatory Engine Maintenance for Reducing Vehicle Exhaust Emissions. Volume VIII. Experimental Characterization of Vehicle Emissions and Maintenance States


    Publication date :

    1973


    Size :

    203 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English