What Causes Water Spray from the Car Exhaust Pipe?

[StAndres]

Water spray from the car exhaust pipe occurs because after gasoline combustion, the main emissions from the exhaust pipe are carbon dioxide and water. When the engine temperature is high, water is present in the form of water vapor. Upon encountering the cold outside air, the water vapor condenses into small droplets, which are then expelled through the exhaust pipe. There are two scenarios for this emission: dripping and spraying. Water spraying when the throttle is wide open indicates that the fuel is burning completely and the cylinders are in good working condition. Gasoline is a mixture primarily composed of hydrocarbons. After complete combustion, it produces water vapor and carbon dioxide. When the water vapor passes through the cold exhaust pipe, it condenses into small droplets that flow out of the exhaust pipe.