Humans are curious animals. Gun aficionados love shooting at anything that moves. So some curious mind with an old, almost unserviceable vehicle and a powerful .50 cal rifle decided to answer this question: will a .50 shot stop a running engine?
Sometimes, the best way to take out an incoming vehicle born IED is just to shoot straight through the engine and shut the vehicle down in its tracks.
We shoot at targets, pumpkins, bottles, trees, wild animals, etc. Why not shoot an old truck with a .50 cal and find out if it would still run after a being shot? The process of finding the answer is as interesting as the answer itself.