Why? If it runs on a internal combustion engine (and uses gas or some other fuel), it's an engine; if it's electrical, it's a motor. An electric car runs with a motor. The thing that moves your windshield wipers is a motor.
So, generally, they have lots of engines and few (if any) motors under the hoods at most U.S. racetracks.
Maybe someone will someday open Electrical Motor Speedway; they could run electric cars. That would work. And I think EMS would be fun.
They'd just need a lot of electrical outlets and batteries.
UPDATE: You can find more about electrical racing here.
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