The 4th stroke, the exhaust stroke.
Exhaust
The release of CO2, H2O, and CO occurs during the exhaust stroke of the four-stroke engine cycle. As the burnt fuel-air mixture is pushed out of the cylinder, it combines with oxygen to form these byproducts before being expelled through the exhaust system.
exhaust
compression and ignition
combustion and expansion
The heat from the combustion reaction causes the pistons to move during the power stroke in the four-stroke engine cycle. This is when the high-pressure gases from the combustion expand, pushing the piston downward.
combustion and expansion
In an engine, it a work that helps to finish one cycle..... It can be also said like a step to release the energy and it also releases energy. For every action some amount of energy released.......
Compression and ignition
The first step of the nitrogen cycle is nitrogen fixation.
If one step is out, water cycle will be imbalanced. It disturbs water cycle.
A four stroke internal combustion engine can have any number of pistons, from one to one million. They usually have even numbers in order to maintain engine stability. The "four stroke internal combustion" signifies the type of engine. There are two stroke internal combustion engines, mostly one or two cylinder engines used in lawn mowers. An internal combustion engine is one that ignites an air fuel mixture within itself and uses the resulting explosion for power. There are external combustion engines, which are usually powered by steam heated in a separate container and pumped into the engine. Four stoke engine utilize a four step (or stroke) process in order to run. The steps are the intake stroke, where the engine breaths in air and fuel, the compression stroke, where it squeezes the air and fuel, the power stroke, where it ignites the air fuel mixture, and finally the exhaust stroke, where it pushes the remains of the ignition out. See the attached link for a graphic description of how two and four stoke engines work.