How do modern internal combustion engines actually work?

A modern internal combustion engine is like a super-powered toy car that never stops moving, it keeps going by making tiny explosions inside its body.

Imagine you have a box full of matchsticks and balloons, and every time you light one, the balloon pops and pushes the box forward. That’s kind of how an engine works, instead of matchsticks and balloons, it uses gasoline and air, and instead of popping, it makes tiny explosions that push a special piston inside.

1. The engine draws in air and gasoline, like breathing in before running.
2. It compresses the mix, squeezing it tight, just like when you squeeze a balloon to make it pop faster.
3. A spark makes it explode, like lighting a matchstick inside the squeezed balloon.
4. The explosion pushes a piston, which turns a crankshaft, this is like turning the wheels of your toy car.

These steps happen over and over, very quickly, making the engine run smoothly, just like how you keep running after you start.