What is the function of adding a fine mist of water to the fuel-air mixture in a conventional gasoline engine?

Answer

To lower combustion temperature, preventing engine knocking and allowing for higher compression ratios.

Water injection is a performance modification that cools the combustion chamber, which is beneficial for engine longevity and efficiency under high load, but the water does not contribute power.

What is the function of adding a fine mist of water to the fuel-air mixture in a conventional gasoline engine?
Chemistrywaterenergyfuelreaction