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"Ventilated" does not = Cross drilled.... (archive)
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Posted by JT///M3 on July 17, 2000 at 09:14:58:

In Reply to: Cross Drilled rotors? Cool! (NT) posted by lionsfan54 on July 16, 2000 at 11:20:07:

E36 M3 had 4 wheel ventilated brake rotors, and E36 328's had just front ventilated rotors. this just means that the rotor is not solid, but rather has a gap between the two sides separated by a series of angled fins to dissipate heat. Also, the famed "cross-drilled" rotors on Porsches are actually cast into that shape rather than drilled after the fact. Actual cross-drilled rotors form cracks that propagate from the holes. Not good.

-JT///M3

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