The Influence of Engine Speed on Exhaust Emission of Four Stroke Spark Ignition Multi Cylinder Engine

An experimental study is carried out to investigate engine performance parameters and methods of reducing emissions from spark ignition engine. Fuel efficiency is one of the major concerns for the users, the designers and the manufacturers of internal combustion (IC) engines, The effect of increasing the temperature of cylinder liner has the advantage of reducing the specific fuel consumption but it increases thermal stresses on piston head, challenges material properties such as high temperature yield strength, creep and high temperature fatigue, increases chances of knocking and pre ignition and decreases the volumetric efficiency. Coolants with specified fluid properties are circulated through inner channels in the cylinder blocks to maintain an optimum temperature. The present investigation reports the experimental study carried out by using three cylinders, four stroke petrol carburetor of Maruti 800 engine. The engine is connected to eddy current type dynamometer to provide suitable loading with provisions for measuring and control of fuel flow to maintain fuel –air mixture ratio. It is found that exhaust emission is a dependent parameter on decrease even at higher loads which confirming that engine perform better upon optimal load condition rather than part load