Exhaust gases rush out of the cylinder, relieving the pressure.Ĥ. As the piston nears the bottom of its stroke, all of the exhaust valves open. The pressure created by the combustion of the fuel drives the piston downward. Diesel fuel is sprayed into the cylinder by the injector and immediately ignites because of the heat and pressure inside the cylinder.Ģ. When the piston is at the top of its travel, the cylinder contains a charge of highly compressed air. Two-stroke diesel cycle goes like this:ġ. Both things happen at the same time which makes it a 2 stroke engine. Two strokes get completed along with one power cycle.įrom the 2nd downstroke onwards the exhaust gases get expelled out from one side while a fresh mixture enters into the combustion chamber simultaneously due to the partial vacuum created in the combustion chamber after removal of exhaust gases. This mixture is ready to go into the combustion chamber during a downstroke but remains in the crankcase until the piston goes up till TDC. When the mixture is pushed up into the combustion chamber during the previous upstroke, a partial vacuum is created as no mixture is left behind in the crankcase. While this inlet port is opened, the mixture gets sucked inside the crankcase. During the upstroke, the inlet port is opened. As the mixture gets expanded, the piston moves down. The fuel-air mixture gets compressed & spark plug ignites the mixture. The fresh air-fuel mixture gets into the combustion chamber through the crankcase. (At the same time, another crankcase compression stroke is happening beneath the piston.) WORKING OF 2 STROKE ENGINESįirst, the piston is moved downside from TDC to BDC to let the fresh air enter into the combustion chamber. The burning fuel expands, driving the piston downward, to complete the cycle. (At the same time, another intake stroke is happening beneath the piston).Īt the top of the stroke, the spark plug ignites the fuel mixture. The piston then rises, driven by flywheel momentum, and compresses the fuel mixture. Unfortunately, some of the fresh fuel mixtures is usually expelled as well. This expels the exhaust gasses out the exhaust port, usually located on the opposite side of the cylinder. Toward the end of the stroke, the piston exposes the intake port, allowing the compressed fuel/air mixture in the crankcase to escape around the piston into the main cylinder. The fuel mixture is then compressed in the crankcase during the remainder of the stroke. The illustrated engine features a poppet intake valve however, many engines use a rotary value incorporated into the crankshaft.ĭuring the downward stroke, the poppet valve is forced closed by the increased crankcase pressure. The fuel/air mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston. two stroke engine CYCLES OF TWO STROKE ENGINE It allows to enter fresh air with fuel & to exit the spent air-fuel mixture from the cylinder.Ī spark plug delivers electric current to the combustion chamber which ignites the air-fuel mixture leading to an abrupt expansion of gas. Compared to four-stroke engines, two-stroke engines have a greatly reduced number of moving parts, and so can be more compact and significantly lighter. Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds called the “power band”. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time. This is in contrast to a “four-stroke engine”, which requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. Two Stroke Engine : Parts, Cycle, Diagram, Working, ApplicationĪ two-stroke (or two-cycle) engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution. Two-stroke diesel cycle goes like this:.Two Stroke Engine : Parts, Cycle, Diagram, Working, Application.
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