Quote:
Originally Posted by The HACK
Blowing air directly onto the rotor does little to control brake rotor temperature, blowing air into the central hub does most of the work, because vented rotors cool by sucking air in through the center of the hub and blowing it out of the vanes through the spinning action of the rotor. Cutting the shield is unnecessary, that's why you see most of the racing brake duct design that replaces the dust shied redirect the majority of the cool ambient air to the center of the rotor, not the rotor surface.
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This is correct. These will have little to no effect.