Well, on the DC-6, we had water injection on the R-2800's, which gave us an added 450 HP per engine, by de-riching the fuel mixture,and enableing us to use 59 1/2 inches of manifold pressure to give us a mixture that produced more power. Worked good, but the pucker factor on take off was quite something about all those pistons trying to escape from the cowling!! and sometimes they did!!!!!
Water injection? what the hell is that?