# data[].attributes.body
In this phase the piston pushes, in its upward motion, the combustion gases that exit through the exhaust valve that remains open. Upon reaching the maximum upper stroke point, the exhaust valve is closed and the intake valve is opened, the cycle being restarted. During this time the crankshaft rotates 180º and the camshaft rotates 90º.

# data[].attributes.body
At the end of the upper stroke the gas has reached the maximum pressure. In spark-ignited or Otto-ignition engines the spark sparkles in the spark plug, causing the mixture to ignite, while in diesel engines, the highly pulverized fuel is injected through the injector, which ignites itself by pressure and temperature existing inside the cylinder. In both cases, once combustion has begun, it progresses rapidly by increasing the temperature and pressure inside the cylinder and expanding the gases that push the piston. This is the only phase in which work is obtained. At this time the crankshaft rotates 180º while the camshaft rotates 90º respectively, both valves are closed and its stroke is descending.

# data[].attributes.body
At the end of the lower stroke, the intake valve closes, compressing the gas contained in the chamber by the rise of the piston. In the 2nd time the crankshaft gives 360º and the camshaft gives 180º, and in addition both valves are closed and its stroke is ascending.

# data[].attributes.body
First time or admission: in this phase the piston descent sucks the fuel air mixture in the ignition ignition engines (MEP) or the air in compression ignition engines (MEC). The exhaust valve remains closed, while the intake valve is open. In the first half the crankshaft rotates 180º and the camshaft gives 90º. The intake valve is open and the stroke of the piston is descending.