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different methods for drilling (archive)

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Posted by silla 91m3 on July 24, 2000 at 13:11:35:

In Reply to: If cross-drilled rotors suck so bad... posted by MPWR on July 24, 2000 at 12:06:01:

porsche rotors are cast with the holes already in them, so they are not really drilled.
drilling the rotors after they are made can weaken them structurally, so they tend to crack after a while of hard usage.

The main reason for drilling rotors is to reduce the unsprung weight when you add such a large piece of metal, 13 inchers, to your car's front end.
on smaller brake diameters, like 11" on M3's it is actually smarter to get slotted rotors, they don't have the stress crack as do drilling and they actually have more surface area, and more metal to act as a heat sink, which braking systems really are.
so cross drilled may look good, but for M3's slotted will perform and last better.

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