Most people never really stop and think about the minor miracle that happens every time they start the engine of their car. Gasoline is sprayed into a tiny metal box where it explodes over and over again. This heat energy is than transformed into the kinetic energy that moves the car. The crankshaft is one of the key players when it comes to the energy transfer that makes motion possible. Basically, the crankshaft is connected directly to the engine, and is spun in a constant circular motion in time with the hundreds of explosions. This circular motion is than transferred, through a series of other parts, to the wheels.