AN INVESTIGATION INTO ENGINE EXHAUST EMISSION

Abstract

The growth in population plus the growth in energy consumption per person have combined together to give dramatic increases in air pollution problems.

The automotive vehicle has been a significant contributor to air pollution, so the ad• vanced country governments made regulations for controlling this problem whereas the devel• oping countries such as Egypt do not have sufficient feeling of danger.

The aim of this work was to show the importance of engine adjusting and maintenance according to the manufactures recommendations in idling mode, especially the major con• centration of pollutants emitted in an idling mode.

One of the common type engines in Egypt was chosen to conduct a group of experi• ments to investigate the effect of some parameters belonging to engine, such as, the effect of mal adjustment of idle mixture metering screw, static spark timing, spark plug gap, contact breaker points clearance, spark plug seat, float carburettor clearance and inlet and exhaust valve clearances, on hydrocarbon (HC) and carbon monoxide (CO). Also, a comparison was carried out between HC and CO emissions for both conventional and the electronic ignition systems.

Experiments showed that deviations from the standard settings resulted in relative rates of increase in HC and CO emissions. This means an increase in pollutants in crowded streets due to neglecting maintenance and ill-adjusting.