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The four stroke engine working

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what is automobile? How to used on early life in automobile.
Previous articles we have discus on two stroke engine, this article we are discuss on four stroke engine. This engine cycle is introduce by German scientist Otto in 1879.The four stroke make a two revolution on the crankshaft, the operation are repeated over and over again in running engine.

The four stroke engines are as follow:

SUCTION STROKE:

you are show in figure during suction stroke, the piston moves on downward TDC to BDC by crankshaft. Which movement of flywheel or by creates power generation by electric starting motor. The inlet valve is open and exhaust valve is closed during this stroke. The downward movement by the piston sucks air-fuel mixture in the cylinder. The carburetor through the open inlet valve. Air-fuel mixture broken up into a mist and partially vaporized in the carburetor.

COMPRESSION STROKE: 

show in the figure during compression stroke, the piston moves on upward. Thus the compressions air/fuel in charge. Ignition and much of the compression also in during stroke. The heat produce by compression stroke more homogenous mixture air/fuel intake cylinder. The heat makes the petrol easy to burn while compression stroke. The mixture under compression is ignited by the spark produce by a spark plug and the compression is half cycle when piston in TDC. Both inlet and exhaust valves closed during the compression stroke.

POWER STROKE:

show on figure the expansion of the gases due to the heat of compression exerts a pressure on the cylinder and piston. The piston moves on downward thus doing useful work. Both valve remains closed during this stroke.

EXHAUST STROKE:  

show on the figure during this stroke, the inlet valve closed and exhaust valve open. The burning of their own expansion. The piston moves on downward and pushes the remains gases out of the open exhaust valve. Only a small quality of gases remains in the  clearance space.
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