Do NASCAR engines use coolant

Answer 1

No, NASCAR engines are cooled by water. Ethylene glycol cannot be used due to the fact that if there is a wreck, the track will remain slick in that area and a hazard. In addition, it would not be good for the environment.

Answer 2

No. They use a restrictor washer - a round plate with a hole in the middle of it, to slow down the flow of water through the engine.