<human>:  How does a car engine work?
<bot>: A car engine uses a combination of fuel and air to create a controlled explosion inside cylinders in the engine block. This explosion forces the pistons down into the cylinder and generates the mechanical energy that is necessary to power the car. The fuel and air mixture is delivered to the cylinders via the intake manifolds, fuel injectors, and carburetors. It is then ignited by the spark plugs, creating the necessary energy to power the car. The exhaust produced from this process is then expelled from the engine via the exhaust manifolds.