http://www.s2ki.com/s2000/topic/7448...re-than-usual/Originally Posted by bennjamin
Knock yourself (yourselves?) out. Plenty more threads on this topic available too.
Yes but I'm talking about an OEM setup
From what I understand, cracking mainly occurs from sudden changes in temperature, metal fatigue or poor metal composition. A BBK rotor setup will ideally be thicker/larger/be 2-piece to allow for thermal expansion and be able to handle heat better through improved cooling vanes making cracking less of an issue. I'm guessing if you over-engineer a setup, you could probably engrave hello kitty on them if you wanted to and it wouldn't crack (braking performance however...)But it also depends on the metal composition and how it has been cast. A lot of factors... probably better to speak to a metallurgist really for a much better explanation
Anyway this page explains some of the points better than I can...
http://www.urgedesigns.com/brakes.html
Yes and cross drilled even worse - I had an engineer explain it to me through diagrams (not directly about rotors mind you but how to avoid weak spots in metal structures) but I cbf drawning diagrams haha.
The best way that I can (poorly) explain it is to file out a small groove in a pencil. Snap it. It snapped along the groove most likely right? Now snap a pencil without a groove. Which one was harder to snap?
Of all the cracked slotted rotors I've seen, the cracks develop within those "slots" (or on 2 piece rotors, they seem to develop small cracks near the alloy hat bolts and/or through the slots). That's not to say though that you shouldn't use slotted rotors at all... just preferably not on a OEM S2000 rotor setup
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