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Old 07-04-2013, 10:19 PM
CdnoilRAM's Avatar
CdnoilRAM CdnoilRAM is offline
I push the skinny pedal


 
Join Date: Jul 2009
Location: Calgary, AB, CA
Age: 30
Posts: 17,006
Gender: Male
Vehicle: 2009 Blown 349 Hemi
Trim Level: Sport - Modified
Color: Brilliant Black/Snake Skin Green
Engine: 2009-2012 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Rep:3236
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The original intent of drilled/slotted rotors was never to provide additional cooling, it was to give the gasses created by the pads at high temps a place to go and reduce the brake fade issues with older pad materials. With the modern pads there is no issue with off-gassing in heavy braking situations unless you're doing something super demanding like road course racing.

Drilled/slotted rotors are actually more prone to warping when compared to a standard solid rotor and they can not be machined like a smooth rotor can, so once they're warped that's it. Cross-drilled rotors had cracking problems around the holes because the hole created a high concentration of heat that could not be dissipated and the rotor would try to expand but the hole could not contract thus creating a high stress point. Modern cross-drilled rotors have a lesser issue with this just based on new alloys being utilized.

The only way to increase rotor cooling is to increase the rotor's surface and body area so there's more rotor material to absorb and dissipate heat. The addition of cooling tracts BETWEEN the rotor faces allows the best way to prevent heat soak of the material by cooling the rotor body from the inside.
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