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Originally Posted by coldkilla
you do not need drilled/slotted rotors. just check baers website and they even tell you they are just cosmetic. with the advent of ceramic pads, slotted rotors are obsolete. older, organic compound brake pads used to give off a lot of gases and slots were necessary but todays pads do not give off much gas so you dont need slots. drilled rotors WILL crack, its just a matter of when, and anyone who thinks that drilled holes help cool the rotor, they are wrong. mass is the only thing taking away heat from that rotor besides some brake ducting. those holes lessen the mass and effectively lower the rotors ability to transfer energy into heat. for some really good info on brakes, check out www.frrax.com |
FYI, mass does not transfer heat. the surface area of the pad and the material properties are the deciding factors in the heat transfer. that being said, drilled rotors will cool better because they allow forced convection via turbulent air flow to exist between the rotor and the pad. the holes cause the air flow around the rotor to "trip" turbulent. turbulent flow will always transfer more heat than laminar.