not BREAKING my wallet, drilled n' slotted disc? Options

[LAcelica94St]

hey dudes, i have been checking around ebay looking for some good
disc brakes. can anyone tell me what type to get, as in more bang for my
buck? Drilled or slotted or drilled and slotted? and whats this stuff about being
about being silver or zinc finish? does it matter, i just want enhanced braking power
and better handling. Any pointers??

[Galcobar]

Drilling and slotting brake rotors is really a fools game in this day and age. At a time when brake pads off-gassed, holes through the rotor were a way to ensure proper contact. Back when brake pads glazed due to high heat, slots would scrape the glazing and restore a proper friction surface.

Now neither are necessary, courtesy of modern pad formulations which prevent off-gassing, and track/race pads which do not glaze at high heat.

On the other hand, drilling holes or cutting slots in the rotor weakens the metal's crystalline structure. Porsche casts its rotors with holes, to avoid compromising the rotor's integrity and help prevent cracking. Reducing the surface area of the rotor reduces the ability to transfer heat from pad/caliper to rotor. Reducing the rotor's mass means it can absorb (and therefore dissipate) less heat. Since the entire point of the braking system is to transform kinetic energy into thermal energy and disperse that energy into the air, that means less braking capability overall.

Really good thread on the issue: http://www.celicatech.com/forums/showthrea...ors-quot-Thread

[LAcelica94St]

Drilling and slotting brake rotors is really a fools game in this day and age. At a time when brake pads off-gassed, holes through the rotor were a way to ensure proper contact. Back when brake pads glazed due to high heat, slots would scrape the glazing and restore a proper friction surface.

Now neither are necessary, courtesy of modern pad formulations which prevent off-gassing, and track/race pads which do not glaze at high heat.

On the other hand, drilling holes or cutting slots in the rotor weakens the metal's crystalline structure. Porsche casts its rotors with holes, to avoid compromising the rotor's integrity and help prevent cracking. Reducing the surface area of the rotor reduces the ability to transfer heat from pad/caliper to rotor. Reducing the rotor's mass means it can absorb (and therefore dissipate) less heat. Since the entire point of the braking system is to transform kinetic energy into thermal energy and disperse that energy into the air, that means less braking capability overall.

Really good thread on the issue: http://www.celicatech.com/forums/showthrea...ors-quot-Thread

wow. that really answers my question. thanks doc!