Not Ranked
Rwillia4 is right on track. Some large ship diesels inject water into the cylinders at time of ignition. The engines are called compression/ignition/expansion type. The water/steam expansion ratio of 1700 to 1 generate tremendous power. Look at the Wartsila site and see 14 cylinder, 108,920 bhp@ 102rpm.
Some jet engines did (still do?) use water injection.
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