Abstract—Asian cities face a serious air pollution problem from two and three-wheeled vehicles that run on two-stroke engines . Inexpensive two-wheelers form a staggering 75-80% of the traffic in most Asian cities. Because two-stroke engines burn an oil gasoline mixture, they emit more smoke, carbon monoxide, hydrocarbons, and particulate matter than the gas run four-stroke engines found in newer motorcycles. Making matters worse, many Asian two-wheelers are converted into three-wheeled "baby taxis" by adding a sidecar. However the vehicle is not designed for the extra weight and the engine burns even dirtier. For small two stroke engine application, it is important that the newer concepts/systems should not adversely affect their existing advantages, particularly those of simplicity and low production and maintenance cost. The present work aims at reducing short circuiting of fresh charge by admitting cooled exhaust gas to pass through reed valves fitted at the upper end of the transfer passage in a crank case scavenged two stroke engine. This resulted in appreciable decrease in specific fuel consumption and in HC/CO emissions. The major work involved in the present work was to design and fabricate aluminium flanges which accommodate the reed valves. And an arrangement has been made at the upper end of the transfer passage in the engine cylinder to fasten the flange. A heat exchanger was fabricated in order to cool the exhaust gas at a temperature of about 400oC to avoid the pre-ignition inside the engine cylinder. The performance of the engine was tested using eddy current dynamometer.
Index Terms—EGR (Exhaust gas recirculation), Aluminium Flange, Reed Valves, Heat Exchanger.
Cite: Jayanth Kumar. T, Arun. M, Murugan. G, Mano. R and Venkatesan. J, "Modification of Two Stroke I.C Engine to Reduce Emission and Fuel Consumption," International Journal of Engineering and Technology vol. 2, no. 1, pp. 42-47, 2010.