What is Engine? What are its Types?

Engine is the heart of an automobile. It is a device that converts chemical energy of fuel into mechanical energy which is used to drive vehicle. It is basically a device that produces power.
In automobile I.C. engines are used. I.C. engine is the engine in which combustion (burning of fuel) takes place inside a cylinder and it suddenly generates a high pressure force. This pressure force generated is used to drive vehicle or rotate wheel by use of some mechanism.

What is Engine? What are its Types?


Internal combustion engine may be classified as given below-


According to the design of engine:

1. Reciprocating engine (piston engine)
In reciprocating engine the pressure force generate by combustion exerted on the piston(A device which free to move in reciprocation inside the cylinder) and it transmit the pressure force to crank shaft by use of connecting rod. So the crank shaft starts to rotate and rotate the wheel of vehicle.

2. Rotary engine (Wankel engine)
In rotary engine there is a rotor which is free to rotate. The pressure force generated by burning of fuel is exerted on this rotor, so the rotor rotates and state to rotate the wheel of vehicle.

According to the fuel use:

1. Diesel engine (compression ignition engine)
In diesel engine, diesel is used as a fuel. It is also known as C.I. engine because there is no extra equipment to burn the fuel. Burning of the fuel starts due to the temperature rise in compression of fuel or air.

2. Petrol engine (spark ignition engine)
In petrol engine petrol is used as a fuel. It is also knows as S.I. engine because in this the fuel is burn by the spark generated inside the cylinder by some extra equipment (spark plug).

According to the stroke:

1. Two stroke engine
In two stroke engine, crank shaft rotate one revolution in one time of fuel burn.

2. Four stroke engine
In four stroke engine, crank shaft rotate two revolution in one time of fuel burn.  


3. Six stroke engine
In six stroke engine, crank shaft rotate three revolution in one time of fuel burn.

According to number of cylinders:

1. Single cylinder engine:
Engine has only one cylinder and piston connected to the crank shaft.

2. Multi-cylinder engine:
In this type of engine more than one cylinder and piston connected to crank shaft.

According to arrangement of cylinder:

1. In-line engine
Cylinders are positioned in a straight line one behind the other along the length of the crankshaft.

2. V-type engine
An engine with two cylinder banks inclined at an angle to each other and with one crankshaft known as V-type engine.

3. Opposed cylinder engine
An engine with two cylinders banks opposite to each other on a single crankshaft (V-type engine with 180o angle between banks).

4. W-type engine
An engine same as V-type engine except with three banks of cylinders on the same crankshaft known as W-type engine.

5. Opposite piston engine
In this type of engine there are two pistons in each cylinder with the combustion chamber in the center between the pistons. In this engine a single combustion process causes two power strokes, at the same time.

6. Radial engine
It is an engine with pistons positioned in circular plane around the central crankshaft. The connecting rods of pistons are connected to a master rod which, in turn, connected to the crankshaft.


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