Brief Description of a Car Engine working
Nowadays everyone loves to travel. But to travel you cant always walk around, you need a vehicle to roam around. A car engine is a device that moves a vehicle.
An automobile engine is a device that converts chemical energy into mechanical energy. Before going forward you need to know the classification of the engine and engine working.
There are two basic types of Car engines.
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Internal combustion engine.
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External combustion engine.
In an internal combustion engine fuel is burnt inside the cylinder and in external combustion engine fuel is burnt outside the combustion chamber.
Engine working On the basis of Stroke
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Two-stroke Engine.
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Four-stroke Engine.
A two-stroke, engine cycle is completed in two strokes of a piston, or in a four-stroke engine the working cycle completed in four strokes of the piston.
Today will be discussing the 4-stroke engine. Because 4- stroke engine SI is a mostly used engine in the automobile industry.
Benefits of a 4-stroke SI engine.
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More Fuel Efficiency
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Less pollution
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More durability
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No Extra Lubrication oil need in the Fuel.
Parts of 4 stroke SI engine.
We only discuss major parts
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Piston
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Cylinder
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Valves
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Manifold
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Crankshaft
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Spark Plug
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Exhaust manifold
A 4-stroke engine is an engine that completes its working cycle in four strokes ( distance between T.D.C and B.D.C.) of the piston. the four strokes are suction, compression, power, and exhaust. We will discuss these strokes one by one.
Suction stroke –
In the suction stroke, the mixture of air and fuel is introduced in the cylinder by the downward moment of the piston. At this position, the pressure inside the cylinder becomes less. And that space is occupied by the new fresh charge ( air-fuel mixture).
Compression stroke –
During the compression stroke, the piston moves in an upward motion and compresses the air and fuel mixture that taken inside during suction stroke. During this process, both inlet and outlet valves will remain closed. When the piston reaches the top dead center, a spark plug makes a spark to burn the fuel.
Power/Expansion stroke –
In the compression stroke fuel is burnt inside the cylinder at the top dead center, this process pushes the piston towards the bottom dead center. This is the power stroke, the piston connects with the crankshaft with the help of the crank which converts the reciprocation motion of the crank into the rotatory motion of the camshaft. During this process, both valves will remain closed.
Exhaust stroke –
During this stroke, all the burnt gasses push outside the cylinder with the help of an upward moment of the piston. During this stroke outlet valves open to release gasses to the exhaust manifold. After that, mufflers damp the noise of gasses.
Working of the four-stroke diesel engine is also same. But instead of the spark plug, fuel injectors are used. And during the suction stroke, only air is taken inside the cylinder.
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