The point is, your motor needs to be small enough to fit into the space available, tough enough to bounce around, light enough, and intermittent duty. Those motors are built exactly to work well in a car.
Scavenging an AC motor? The next best place to find an AC motor for your electric car is in a forklift. Most of the traction motors for forklifts are series wound DC, but you can often find AC motors in the more modern ones.