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Sorry for bringing back an old thread, but I missed the party the first time around. Putting smooth covers on the outer dual on a big rig has no effect on brake drum temps. There is a 2 inch gap between the inner and outer tires and any air comming from the outer rim would get pushed out the rear by the air comming from the front of the tractor. The drums are recessed in the inner rim, protruding inward from the rim area to catch cooling air. I have seen front scoops in place of backing plates to duct more air flow toward the drums on some trucks.
Current truck mech, JB.
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