Working of four stroke petrol engine

• A four stroke engine is an internal combustion engine in which the piston completes four separate strokes while turning the crank shaft.

• A four stroke engine delivers one power stroke for every two cycles of the piston.

• Following strokes are continuously taking place.

ü Suction stroke – Suction of air fuel mixture takes place.

ü Compression stroke – Adiabatic compression of air fuel mixture.

ü Power stroke – Combustion and adiabatic expansion taking place.

ü Exhaust stroke – Burnt gases are exhausted from the cylinder.

SUCTION STROKE :-

• During suction stroke, inlet valve is opened and exhaust valve is closed.

• Piston moves TDC to BDC

• When the piston moved TDC to BDC vacuum is created inside the cylinder.

• Due to the vacuum air fuel mixtures is drawn into the cylinder.

• Inlet valve is closed at the end of suction stroke.

COMPRESSION STROKE :-

• In compression stroke piston moves from BDC to TDC.

• Air fuel mixture is compressed by the movement of piston (Upward direction).

• Both valves are closed in this stroke.

• Now the volume of air fuel mixture is reduced and pressure of the gas is increased.

• At the end of compression stroke air fuel mixture is ignited by the spark plug.

• Now burning of the air fuel mixture takes place.

POWER OR EXPANSION STROKE:-

• Due to the combustion, high pressure and temperature are developed inside the engine.

• At this time two valves are closed.

• Now piston moves TDC to BDC by this pressure. Due to this movement crank shaft is rotated.

• Here, reciprocating motion of the piston is converted into the rotary motion.

• So that Power will be created in this stroke.

EXHAUST STROKE:-

• In this stoke piston moves BDC to TDC.

• At this time inlet remains is closed and exhaust valve opens.

• Now burnt gases are goes to the atmosphere through exhaust valve.

• At the end of exhaust stroke exhaust stroke will be closed and inlet valve will be opened.

• Now suction stroke will start.

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