In Reply to: zimmerman drilled rotor experiences? posted by bert on October 27, 2000 at 21:04:35:
The only "cross drilled" rotors which don't have a tendency to crack are the stainless steel Porsche rotors. These rotors have holes cast in them during the manufacturing process and they are smaller. Thus, there is no tendency to crack.
If you STILL insist on cross drilled rotors, I suggest you pull the wheels at least monthly and inspect those rotors very closely on both sides for cracks. Replace the rotors if the cracks extend all the way to the edge or connect two holes together. Tiny surface cracks are normal, but larger ones are cause for concern.
The major factor in rotor longevity is not drilling holes or slotting or cryo tempering. It's the original manufacturing process. A non-drilled German rotor manufactured with quality materials and processes will always outlast a cheap, Chinese-made rotor that has been cross drilled, slotted, blessed by a holy medicine man, cryo-tempered, or drizzled with Slick 50. :-)
It's the basic metallurgy that's critical.