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War emergency power in WW2 planes was highly over boosted supercharged with a life expectancy measured in minutes. Water injection kept the engines from literally blowing up.
I could see it in supercharged and turbocharged cars running very high boost levels, like 20 PSI and higher for maximum performance.
I have also used a Binks #7 paint gun to atomize water and blow it into the intake manifold to clean the carbon out of a few engines.
The old man tried it in a 1950 Dodge he bought in 1966 with 30 k original miles to get some carbon out of the engine.
Steam or highly vaporized water absorbs a lot of heat that would normally increase combustion pressure. It can also remove some carbon so you do not have to retard the timing to prevent pre ignition.
regards
Mech
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