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Cooling

Popping Off: Breaking the Two-Car Draft by Heating up the Engines

In a NASCAR car, the pop-off valves open and route the escaping steam and/or water through a tube that passes up near the right-hand side of the car’s windshield. When you see a car “pushing water”, the maximum pressure has been exceeded and the pop-off valve opened. […]

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Dean Sicking
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Dean Sicking