FOURSTROKE DIESEL ENGINE

                                                        FOURSTROKE DIESEL ENGINE

The fourstroke diesel engine works as here in.When the piston is moving upward and is close to TDC,the inlet valve is opened.As the piston moves downward vacuum is created in the cylinder.Air is alone sucked in.The piston after reaching BDC begins to rise.At this point the inlet valve is closed,and the exhaust valve is already in the closed positions.Now the piston moves upward  and compresses the air to a great extent compared to that in a petrol engine.Due to compression,temperature and pressure of air increase.At the end of the compression stroke,Fuel is into the hot compressed air,in the form of fine spray.The heat of compression in the air ignites the injected fuel.Combustion takes place.High pressure thus develeped forces the piston to move downward.The piston is connected to crankshaft by the connecting rod.As such the crank shaft is rotated .After the powerstroke,piston rises up.Now the piston pushes combustion products out of the cylinder.As the piston approaches close to TDC intake valve is opened.Atmospheric air begins to enter the cylinder.The cycle of operations g

ets repeated again and again and the engine continues to work.


To watch the working of fourstroke dieselengine-click here

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ENGINES

                  ENGINES

It is the heart portion of a vehicle,in other words driving portion.It’s an assembled form of many other parts like oilsump,cylinder,piston,valves etc.When the engine starts a fly wheel(a wheel of high mass)begin to rotate,it will rotates in high speed crank and it’s connected to the crankshaft which drives the piston,the piston is placed in a cylinder.The other end of crankshaft is joined to timing gear or pulley.This portion controls the valve timing.Then a shaft called camshaft driven by this timing gear,it controls the opening and closing of the inlet and outlet valve.This drive is given by a special part called tappet and push rod.The returning force to the valve is given by a spring.Its the simple working of a  engine,there are many other operations like cooling and lubricating.There is an additional oil sump is used to store the oil and to distribute it.When all these processes works properly then its called an engine.

Parts of an Engine:

1-Fly wheel

2-Crankshaft

3-Timing gear or pulley

4-Cam shaft

5-Tappet & push rod

6-Piston

7-Cylinder

8-Oil sump

9-Cooling system

10-Valve mechanism

Classifications

According to strokes:

                   Fourstroke engine

                   Twostroke engine

According to position of cylinder:

                   Vertical engine

                   Horizontal engine

                   Inclined engine

According to fuel used:

                   Petrol engine

                   Gas engine

                   Diesel engine

According to the combustion take place:

                   Internal combustion engine(IC)

                   External combustion engines(EC)

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IC ENGINES & EC ENGINES

IC ENGINES & EC ENGINES:
                       IC engines and EC engines are one of the main classifications of engines.This classification is based on the combustion take place.If the combustion take place inside of the engine that's IC engine and the combustion take place outside of the engine it's EC engine.

INTERNAL COMBUSTION ENGINES:
                      They are more compact in size,because the combustion is inside the engine cylinder.These types of engines are commonly used in the automobile industry.Because it is lighter in weight and smaller and size.There is no need of another boiler or something,it  is the main particle of it.The combustion means to produce a gas or steam, this steam will force the piston.In IC engines this steam or gas is produced by the help of spark plug(in petrol engine) or the help of fuel injector(in diesel engine).This technology can provide more compact construction for an engine.So the IC engines are widely used.There is no need of an extra boiler for the combustion,the combustion take place in the engine cylinder.
ADVANTAGES:
              >It is more compact in construction
              >It can provide more efficiency
              >High speed engine
              >Fuel efficiency is high

EXTERNAL COMBUSTION ENGINES:
                     They are comparatively large in size and there is a need of external boiler,so it is named external combustion engine.The gas or steam produced by the boiler will passed through a pipe or tunnels.The old types of trains are the best example for it.So they are large in size.So they are commonly used in factories or machinaries.They need high maintanance and needs more care.They can provide more power to the engine.because the boilers are huge in size.


ADVANTAGES:
             >It can provide more power
           









IC engine working-Watch
EC engine working- watch

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Diesel engines

DIESEL ENGINES:
             It is large in size and more noice,it has low fuel efficiency.But it is also widely using as the petrol engines.The pure diesel is used as the fuel in a diesel engine and there is no mixing of air or another.The fuel injector is used to spray the diesel into the cylinder.The fuelinjector can make the diesel into small particles.So a small compression can burn this diesel.The compression is given by the piston.It's piston is different from the petrol engine's.The piston is called "difflector piston".It's head will created in a special shape to a particular use(It is used to difflect the burned diesel into two direction).If the head is flat the burned fuel will rotates like a cycle.so the difflector piston is used to difflect this burned fuel in the outlet valve.This is the working principle of a diesel engine.

ADVANTAGES:
          >The fuel is comparatively less cost.
          >Used for heavy vehicles
          >It can offer more power

Diesel engine working watch

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