Engine breathing system, type and working |crank case ventilation system

engine-breathing-system-type-and-working


As we know during operation an engine is also required breath. Because of this the engineers developed a good system, namely engine breathing system or crank case ventilation system.

Working of engine breathing system:-

During the engine operation when piston moves TDC to BDC and from BDC to TDC then some amout of suction and pressure take place inside the crank case. When piston moves TDC to BDC then pressure created inside the crank case and when piston moves BDC to TDC then a suction created inside the crank case. 

Engine breathing system, type and working

If we don't release this pressure and suction than it will be a reason for some defects inside the engine and engine not work properly, even piston also not move smoothly. That why the engine breathing system is much more important for an engine.

Type of engine breathing system

Engine breathing system, type and working

Type of engine breathing system:-

There are two type of engine breathing system which are follow-

1. Negative crank case ventilation system.

2. Positive crank case ventilation system.

Negetive crank case ventilation system:-

As per it's name this system is negetive in category because of this system release complete mist of crank case into the atmosphere, this may increase pollution that's why it's known as negetive crank case ventilation system.

Engine breathing system, type and working


Positive crank case ventilation system:-

In this system generated mist inside the crank case is not release into the atmosphere. It is used with entire air and fuel mixture into the combustion chamber and take part into combustion process. In resulting this system prevent from increasing pollution, that's why it's known as positive crank case ventilation system. 


Engine breathing system, type and working


Important:-

The pollution which happening by mist of crank case or by the engine breathing system is known as crank case emission and crank case pollution.


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