We just learned about the Camshaft.
Another part of a car's engine is the Intake Valve.
There are valves right above the cylinders where the pistons go up and down, and they either let in fuel for the piston or let out the bad stuff called exhaust.
Remember we learned that pistons take in gasoline fuel, then push up so it is pressurized, it explodes with a spark, pushes the piston back down and also makes exhaust which is like smoke from a fire.
So one valve opens to let the fuel in, and the other valve opens to let the exhaust out.
The one that lets fuel in is called the intake valve.
(from: wikipedia - valvetrain)
Kid Facts - Blast from the past: Hydraulic Cylinder
