How does an engine work?


An internal combustion engine uses a combination of air and fuel to work. The efficiency of air and fuel mixture makes a good engine.

An engine is made up of many parts. Before we dissect an engine lets work our way down from the larger components that make it run.

An engine is comprised of the block and cylinder head. The internal components of the engine include crank shaft, connecting rods, spark plugs, pistons, cylinders, fuel injectors, intake and exhaust valves, cam shafts and a timing belt. These components are essectial and what most modern gas engines are made of. Depending on the number of cylinders things can change, but lets look at the basics.

How an Engine Runs

Most engines work off of a 4 stroke process. Lets start off with the piston moving downward, as the piston moves the intake valve opens and cold air and fuel fills the combustion chamber. This stroke is called the intake in stroke as the engine intakes air. On the next stroke, the intake valve closes and the piston moves upward squeezing the air and fuel mixture. This compression makes the explosion much greater and is thus called the compression stroke. The next step is for the spark plug to ignite the compressed mixture forcing the piston down from the explosion. This step is what gives the engine it’s power and is called the power stroke. The last stroke is the piston moving upward with the exhaust valve open expelling all the exhaust.

These 4 strokes : Intake stroke, compression stroke, power stroke and exhaust stroke make up the cycle of an engine. If you had a 1 cylinder engine, these steps would be happening in a rapid secession of one another.