Search Results

Air pollution problems in California required control of vehicle exhaust emissions. The early development of catalytic converters and direct flame afterburners led to relatively complex mechanisms with substantial added cost to the vehicle. An evaluation of the primary factors affecting exhaust emissions indicated the feasibility of control by engine modification alone. A series of engine modifications were subsequently developed which reduced the exhaust emissions to below the California standard of 275 ppm hydrocarbons and 1.5 percent carbon monoxide and are discussed in this paper.

For the 1970 model passenger cars and light trucks, the Federal and California exhaust emission standards were reduced to 2.2 grams per mile hydrocarbon and 23 grams per mile carbon monoxide. This represents a reduction of approximately 33%. This paper presents the development of the significant features of the Chrysler Cleaner Air System of exhaust emission control for 1970. Included in this development are modifications in the engine, carburetor, ignition system, and other related components. Through these modifications and by optimizing the calibration of the engine operating parameters, the new exhaust emission standards were successfully met.