Internal combustion engine Essay Example | Topics and Well Written Essays - 500 words

Internal combustion engine - Essay Example Since the ports remains open during up word stroke, the actual compression starts only after both inlet and exhaust ports have been closed. So actual compression ratio and the thermal efficiency of the two stroke cycle engine is less than that of four stroke engine of the same dimension. In two stroke cycle engines the number of power strokes per minutes are twice the power strokes of four stroke cycle engine. So the capacity of cooling system used must be higher. The cooling of the engine also presents difficulty as quantity of heat remover per minutes is large. The piston gets over heated due to firing in each revolution and oil cooling of the piston is necessary. In two stroke cycle engine some of the fresh charge is mixed with burnt fuel and exhaust through the exhaust port which causes high fuel consumption. So two stroke cycle engine is not widely used except in the case where size is compact for example light vehicles, scooters, out board motor, motor cycle etc .Large two stroke cycle engine are generally CI engines. Two stroke CI engines are better for slow and moderate speeds.