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I checked the exhaust on my old Nissan Z car engine once. At idle it was not even 200 degrees. I think the amount of heat you need to "instantly" turn water into steam just isn't there after expansion of the combustion gasses. If your peak combustion temperature is 3300 degrees and it expands to ten times that volume, how much heat do you really have left over to make "instant" steam.
To get the expanison of the old high power steam engines you need steam at 1000 degrees and many times atmospheric pressure to be "superheated dry steam". I don't think there is enough resudual energy to do that "instantly".
regards
Mech
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