TWO STROKE USING REED VALVES

Computer Engineering electronics Engineering Civil Engineering

In developing countries a large number of private vehicles used two stroke engines. A large percentage of them employ two stroke engines because of their simplicity, high power to weight ratio and low cost of maintenance. Although two stroke engines are less efficient and more polluting they may continue to popular due to low cost and maintenance. The most serious drawback of a two stroke S.I. engine is its higher fuel consumption and higher unburned hydrocarbon emissions when compared with four stroke engine. Fresh charge loss during the scavenging process of a two stroke S.I engine is known to be the principal reason for its high specific fuel consumption and high hydrocarbon emissions. During scavenging process a part of the fresh charge mixes with the residual exhaust gas as it scavenges the cylinder while some of it is loss due to short circuiting. The net effect is that 25%-40% of the charge may be wasted resulting in high fuel consumptions. loading..