Reciprocation
Because they are moving up and down thousands of times per minute.
When you are moving your head up and down it is called duck
The crankshaft changes the up-and-down motion of the pistons into rotary motion in an engine. The connecting rods from the pistons are attached to the crankshaft, which rotates and powers the drivetrain of the vehicle.
up and down
pistons, cams, valves
well if the pistons wont go 'up or down' it wont be taking in any fuel, wont compress it and then wont react with the spark .... car is going nowhere
The up and down movement of a piston is called reciprocating motion. This motion is essential in internal combustion engines where the reciprocating motion of the pistons converts the pressure created by burning fuel into rotational motion to drive the vehicle.
The pistons stop going up and down.
wrong size bearings
gasoline is a fuel. It produces energy when the fuel is burned. In your car the spark makes tiny explosions which drive engine pistons up and down, thus moving your car.
The reciprocating motion of the pistons is converted into rotary motion which is connected to a shaft connected to an electrical generator .
in the engine and they move up and down when it is running