If you're into automotive industry you should know some details about how a car engine works. In the picture bellow this concept it is very nice explained. Let's thank for the image to Jacob O'Neil who posted it on his blog.
This is an engine in 4 strokes:
- intake stroke
- compression stroke
- power stroke
- exhaust stroke
Because of these phases we need an engine with at least 4 pistons, everyone being in a different stroke. In this way a constant power will be ensured.
In the upper left part of the image is explained a typical cylinder and its components. First we have a sparkling plug which has the role to start a fire in the cylinder. The is a fuel injector which is sending gasoline through the intake port. Once the fuel is inside the cylinder it will burn because of the sparkling plug. This burning will produce gases which are creating pressure. This pressure is pushing down the piston and this will move the crankshaft via a connecting rod. Having 4 cylinders in this engine, there will always be a piston moving the crankshaft and this movement is producing a power which moves the car. The pressure in excess is pushing up the valves and these are pushing some cams. These cams are moving the cam gear.
Both cam gear and crankshaft are connected through a belt or a chain. In this way they synchronizes and preventing the pistons to strike the valves.
RPM of an engine stands for "revolutions per minute". You may see them on the car's display. When RPM is 3000 this means the crankshaft moves 50 times in a second.
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