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Eh...
Roughly speaking, in order to raise the temperature of one gram of liquid water by 1 degree C, you'd need the same amount of heat energy that would otherwise heat up 1 gram of air by 4 degrees C. Worse yet, turning that 1 gram of liquid water into steam, would require the same amount of heat energy that would otherwise heat up 1 gram of air by 2200 degrees C.
Now, whenever you raise the temperature of air inside a cylinder, pressure will increase. The same effect is observed when temperature of air is lowered inside the cylinder - its pressure will decrease.
Now, estimating that at the end of the power stroke, the exhaust gas temperature is at 600 C at a pressure of 3 atm, then if you were to inject any liquid water whatsoever into that cylinder, the air temperature inside that cylinder would immediately drop as the heat energy of the air transfers into the injected liquid water. This will cause pressure inside the cylinder to drop as well, which is counterproductive to the stated goal.
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