TWO STROKE ENGINE WORKING
A two stroke engine is an Internal Combustion type of engine which completes a working stroke with two strokes (Up & Down Stroke) of piston during 360 degree of crankshaft revolution.
Main components
1. Spark plug: Spark plug is a device which produces spark within the cylinder. The spark produced is used to ignite the fresh charge in the cylinder.
2. Piston: Piston is the reciprocating part of the engine. It is used for the suction and compression of the fresh charge within the cylinder.
3. Cylinder: it is that part of the two stroke engine which holds piston within it. The inlet and exhaust ports are present in the cylinder. Cylinder head consist of the combustion chamber and the spark plug.
4. Transfer port: It is used to send the fuel from crankcase to the cylinder.
5. Connecting rod: It connects the piston and crankshaft. It transfers the power from the piston to the crankshaft.
6. Crankcase: It acts as the stationary of the engine. It supports the crankshaft and camshaft in suitable bearings and provides the arms for supporting the engine on the frame.
7. Crankshaft: It is that part of the engine which is used to convert the reciprocating motion of the engine into the rotating motion with the help of a connecting rod.
8. Exhaust port: It is used to expulse the burnt gases out of the engine.
9. Inlet port: The fresh charge draws into the cylinder through inlet port.
10. Balancing weight: It is the weight used for the balancing of the engine.
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Two Stroke Engine Running
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As told above two strokes engine require two stroke of piston to complete cycle.
First stroke (also called upward stroke)
In this is stroke Piston Travels from bottom dead Centre (BDC) to top dead Centre (TDC), compressing the air + fuel mixture which ISalready drawn into the cylinder.
During this process, a partial vacuum is created the in the crankcase, Piston uncovers the inlet port and fresh fuel enters into the cylinder. Thus, two operations carried out in one stroke (360 degree revolution).
Second stroke (also called Downword)
In this is stroke, compressed mixture is ignited by the spark plug. As soon as mixture is ignited, the burning fuel expense its gases so the pressure creates inside the cylinder which thrust on the Piston head executing the power stroke.
Within this process, Piston and covers the transfer port. In doing so, the Piston opens the exhaust port and burnt out gases go out of the cylinder to the atmosphere and pre arrived fuel from crankcase by transfer port, travels from the piston deflector towards the exhaust port that deflector allows the expulsion of exhaust gases by incoming fresh charge. This process is known as scavenging. Thus, two process carried out in this stroke.
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