Wilwood Aero 6 Brake Kit at Hammer Performance

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Quick side bar…..Z06 rotors run stupid hot. Like glowing red hot. Heat checking is unavoidable and why we check rotors after every session.

View attachment 449858

Below is why we run slotted rotors versus drilled. Worst game of connect the dots ever. If you look closely you’ll see every drilled hole has a fracture through it. Makes it way too easy for a fully cracked rotor.

View attachment 449859
Are the cracks starting at the holes or outer edge?
 

CVP33

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Are the cracks starting at the holes or outer edge?
Appears to be radiating out from each hole and pretty consistent across the rotor. Makes it easier for a catastrophic failure as a % of material is gone and essentially done the work of cracking for you.
 

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Appears to be radiating out from each hole and pretty consistent across the rotor. Makes it easier for a catastrophic failure as a % of material is gone and essentially done the work of cracking for you.
Interesting as normally a hole would relieve the stress. But in this case, the source.
 

CVP33

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Interesting as normally a hole would relieve the stress. But in this case, the source.
I’m no metallurgist (physical or chemical), but I find it impossible to believe that introducing a hole into an engineered piece of steel somehow makes it more reliable or stronger. Some engineer spent time designing that casting, forging it, testing it……..and then someone else just drilled a bunch of holes in it? Just my $.02
 

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I’m no metallurgist (physical or chemical), but I find it impossible to believe that introducing a hole into an engineered piece of steel somehow makes it more reliable or stronger. Some engineer spent time designing that casting, forging it, testing it……..and then someone else just drilled a bunch of holes in it? Just my $.02
I done reading on this. Structural straight is fine. But the drilling of the holes cause micro fractures. Some expensive for foreign cars cast the holes in the rotors which help. Beveling of the holes also has provided some help. Still an issue. Interesting to me.
 

nikhsub1

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Yeah I was gonna say that if you cast the rotor with the holes, they are less prone to cracking. Drilling them, as you said, introduces micro cracks that if only really street drive, cause little issue - it's at the track where the issues become big bad and ugly.
 
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