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You could design a water reservoir that drips constantly on to the sponge.
Like an inverted caged pet feeder.
Make 2 and use one for a swamp cooler air con, I'd love to know if it really works. Dryer climates benefit more from swamp coolers than tropical humid or wet places.
Removing the crankcase fumes from going back in the engine via air intake, and fixing a mini pod filter MAY also cool the engine considerably. Some motors dont like it though...
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