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I think some of the confusion in this thread comes from two different topics being discussed:
A) What is traditionally referred to as water injection - injecting water with the air/fuel mixture on a 4 stroke engine to help cope with high compression or high boost.
B) Add 2 strokes to a 4 stroke engine. At TDC during the 4th stroke (exhaust) inject a small amount of water, which will immediately vaporize due to the heat of the cylinder and piston, creating a second power stroke. This is the concept of the Crower 6 stroke engine. As a result of excess heat being carried out of the combustion chamber during the 5th/6th stroke, more aggressive timing/boost/compression can be used during the traditional 4-stroke cycle.
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