Quite possibly the best intro to a racing game I have ever seen because of this in depth look into the engine.
Fuel being sprayed into the manifold,
through the 4 vavles into the cylinder, then the explosion of the power stroke.
The springs are attached to the valves and the spinning rod with the egg shaped attachments is the cam. When the egg's tip is pointing down it opens or closes the valves.
Dragon, you further explained my point on VVT. I meant to say the engine's rpms tell the computer chip (ECU) to retard or advance the timing of the opening on the valves. Thanks!