Petrol Engine(adarsh Nagar)
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working
The working of an internal combustion Engine is divided into four stages or four steps called “ four strokes” of the engine, And hence the engine is called a “ four stroke engine” .
The Intake Stroke : • When the engine starts, the piston
moves downwards in the cylinder, because of which a region of low pressure is created in the cylinder, above the piston. At this moment, the intake valve opens and the fuel mixture(petrol vapour and air mixture) is sucked into the cylinder from the carburetor.
The Compression Stroke : • When the sufficient amount of the
fuel mixture (petrol vapour and air mixture) has entered the cylinder, the intake valve gets closed. The piston is then forced to move upwards which compresses the fuelmixture to about one-eighth of its original volume: Higher the compression ratio, more will be the efficiency of the engine.
The Power Stroke : • Before the piston completes its upward
movement, compressing the petrol vapour and air mixture, the spark plug produces a little electric spark inside the cylinder and this spark sets fire to the petrol- air mixture. The petrol vapour burns quickly in a little explosion, producing a large volume of gases and enormous heat. The heat thus produced expands the gases rapidly. The pressure of rapidly expanding hot gases pushes the piston downward with a great force. The piston pushes the piston rod and the piston rod pushes the crank shaft. The crank shaft is joined to the wheels of the car. When the crank shaft turns, the wheels rotate and move the car.
The Exhaust Stroke : • When the piston has been pushed to the
bottom of the cylinder by the hot expanding gases in the power stroke, then the exhaust valve opens. After that, due to the momentum gained by the wheels, the piston is upwards. The upward movement of the piston, expels the spent gases through the exhaust valve into the atmosphere, carrying a way the unused heat. The exhaust valve then closes, the intake valve opens up, and the above four strokes of the engine repeated again and
The working of an internal combustion Engine is divided into four stages or four steps called “ four strokes” of the engine, And hence the engine is called a “ four stroke engine” .
The Intake Stroke : • When the engine starts, the piston
moves downwards in the cylinder, because of which a region of low pressure is created in the cylinder, above the piston. At this moment, the intake valve opens and the fuel mixture(petrol vapour and air mixture) is sucked into the cylinder from the carburetor.
The Compression Stroke : • When the sufficient amount of the
fuel mixture (petrol vapour and air mixture) has entered the cylinder, the intake valve gets closed. The piston is then forced to move upwards which compresses the fuelmixture to about one-eighth of its original volume: Higher the compression ratio, more will be the efficiency of the engine.
The Power Stroke : • Before the piston completes its upward
movement, compressing the petrol vapour and air mixture, the spark plug produces a little electric spark inside the cylinder and this spark sets fire to the petrol- air mixture. The petrol vapour burns quickly in a little explosion, producing a large volume of gases and enormous heat. The heat thus produced expands the gases rapidly. The pressure of rapidly expanding hot gases pushes the piston downward with a great force. The piston pushes the piston rod and the piston rod pushes the crank shaft. The crank shaft is joined to the wheels of the car. When the crank shaft turns, the wheels rotate and move the car.
The Exhaust Stroke : • When the piston has been pushed to the
bottom of the cylinder by the hot expanding gases in the power stroke, then the exhaust valve opens. After that, due to the momentum gained by the wheels, the piston is upwards. The upward movement of the piston, expels the spent gases through the exhaust valve into the atmosphere, carrying a way the unused heat. The exhaust valve then closes, the intake valve opens up, and the above four strokes of the engine repeated again and
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