Join Date: Mar 2003
Location: Fairbanks, Alaska
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To move air takes energy. It maybe electric energy, or mechanical but in the end the engine needs to provide the energy. Either directly using the mechanical fan or electrically through the alternator.
I do not know if it made a difference in mileage, but it really helped the time needed for the engine to warm up in the winter, even with cardboard in front of the radiator. They also work great in deep water, I have wadded out and checked with water up to the carb. The fan was windmilling very slowly, I could grab it by hand and stop it from turning. Much better then the fixed fan, throwing water everywhere. One problem is that they do not seem to last well, I have had two clutches fail, both on the tail, which can be a real pain. I plan to make some small angle brackets with holes in them, to bolt to the pulley under the clutch mount bolts. That way if it fails I can use bailing wire to tie the fan blades to the pulley and be good to go.
By the way I have been meaning to thank you for the great writeup you posted years ago on the MC2100 swap. It made my old CJ7 seem like a new Jeep. Thanks.
I will start using Metric only when the duodecimal system is adopted!!