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4-stroke engine

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The four-stroke internal combustion cycle

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4-stroke engine

The four-stroke internal combustion cycle

David Fernández
1

up spark ignited IGNITION closed up up torsion INTAKE down expand cam downwards EXHAUST burnt POWER downwards thousands explosion intake downwards COMPRESSION away

The four - stroke internal combustion cycle

BEFORE THE CYCLE BEGINS . The cycle begins at top dead centre ( TDC ) . Here the piston is furthest from the crankshaft . There are four strokes of the piston .
STROKE . The crankshaft rotates . This makes the piston move the cylinder , away from the valves . At the same time , the above the intake valve rotates . This makes the valve move , which opens the intake port . As the piston moves down , fuel is sucked into the cylinder through this inlet .
STROKE . As the crankshaft rotates , it makes the piston move the chamber towards the valves . Simultaneously , the cam above the valve rotates and allows it to close . Both valves are now . As the piston moves towards the valves , it compresses the fuel .
. Now the piston is once again at TDC . The compressed fuel is by the plug , and there is a small at the top of the cylinder .
STROKE . Immediately after this , the gases in the cylinder , which pushes the piston . This makes the crankshaft rotate and provides to drive the wheels of the vehicle .
STROKE . As the crankshaft rotates , it pushes the piston the cylinder . At the same time , the cam above the exhaust valve pushes the valve . This opens the exhaust port , and the gases are pushed out .
The cycle is repeated of times per minute .