An Experimental Study for Emission of Four Stroke Carbureted and Fuel Injection Motorcycle Engine

Abstract

Anti-pollution laws in many countries impose a limit on the volume of poisonous gases which may be emitted from a vehicle’s exhaust. The aim of this study is to compare the emission characteristic of a carbureted and fuel injection system of a four-stroke motorcycle engine. For this objective, a carbureted engine of Honda Wave 125 cc was converted into a fuel injection system. Emissions of CO, CO2 and hydrocarbon (HC) were measured in the lab. The test was conducted at three different speeds: 2000, 4000 and 6000 RPM; and at two loads: 5Nm and 10Nm. Upon conversion of the motorcycle engine, the results show improvement in term of reduction of emissions of all three gasses. Emission at a 5 Nm load improved by 62.6%, 29.75% and 11.33% for CO, HC and CO2 respectively. The results also showed a similar trend at a 10 Nm load, where the emissions improved to 75.86%, 30.1% and 47.71% for CO, CO2 and HC respectively. The results show that fuel injection is evidently a better system as it delivers lower emissions.