10-04-2017, 08:01 PM
[attachment=5304]
Introduction
A two stroke engine is one which completes its cycle of operation in one revolution of the crankshaft or in two strokes of the piston. In this engine the function of the intake and exhaust processes of the four stroke engine are taken care by the incoming fresh charge which is compressed either in the crank case or by means of a separate blower while the engine piston is near the bottom dead centre. The engine piston needs only to compress the fresh charge and expand the product of combustion.
In many two stroke engines the mechanical construction is greatly simplified by using the piston as a slide valve in conjunction with intake and exhaust ports cuts in the side of the cylinder. If the engine is running on Otto cycle, the charge consists of correct mixture of fuel and air where as for petrol or duel combustion cycles the charge will consists of pure air.