-If memory serves, the R-3350s, at least the early ones, had a really nasty reputation for overheating anyway. Maybe by the time of the Connie and EC-121 they had it cured, but it was a problem with the early B-29s.
-Overheating is most definitely one of the major problems of a lean burn.
-I think the water/alcohol injection was to help cool the cylinder and prevent detonation, but that's really out of my field.
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