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Four Stroke Diesel Engines

 In our previous blog we have discussed  the working of  petrol engine in a simple manner.If you have missed it kindly refer it. Today let's see the working of 4 Stroke Diesel Engine in brief  and simple way.

Diesel Engines are also known as Compression ignition Engine because the combustion takes place due to high pressure and temperature caused due to compression so there is no requirement for spark plug. In petrol engine we use a valve for air fuel mixture to enter but in Diesel Engine we use fuel injector is used in place of spark plug.

  Now let us take a look at working of 4 stroke diesel engine. Like in petrol engine there are 4 stages of working...

  • Suction Stroke
  • Compression Stroke
  • Power Stroke
  • Exhaust  Stroke     
Suction  Stroke: In case of this stroke, inlet valve is open and exhaust valve is closed.The piston is initially at TDC and moves to BDC due to input. In this stage only air is the input to cylinder.Now at this position,the inlet valve is closed.
SUCTION STROKE

Compression Stroke: As mentioned above the inlet  and exhaust valves are closed.The name suggests, compression happens in this stage.which means the air inside the cylinder gets compressed.Due to compression,there is increase in pressure and temperature.Just before the end of this stroke, the fuel is injected from fuel injector to the cylinder and combustion process happens.The completes first revolution of crankshaft.


                              COMPRESSION STROKE

Power Stroke: In this stage both valves are closed. As there is increase in pressure of gases, the gases exert pressure on piston and it is pushed down . This is continued till piston reaches BDC. At this stage exhaust valve is opened for the next stroke to happen.


 
                           POWER STROKE

Exhaust Stroke: As mentioned above the exhaust valve is open, due to which there is fall in pressure and the piston eventually moves upward to TDC. during this movement the exhaust moves out of exhaust valve. This completes the second revolution of crankshaft.  


                   EXHAUST STROKE
                   
                  The cycle is completed and the next cycle starts.. Click on the video below
                

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