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the close clearance between the blade tips and shroud is a good thing,as it allows higher static pressure difference across the heat exchanger.The tolerance would be tighter except engine torque would allow the tips to collide as engine moves in rubber mounts.-------------- In stop and go traffic without a fan,a mister system could actually wet the cooling fins enough to clog their airways essentially reducing surface area.---------- Additionally,de-mineralized and de-ionized water might be required as dissolved salts in regular tap water could build up on the fins,again,decreasing the effective surface area of the radiator,if not corroding the aluminum which would ruin heat transfer.----------------- Also,thermal "shocking" of the heat exchanger could conceivably alter it's state of,or lack of heat treatment,which could endanger it with fatigue stress encountered during "quenching."
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