Cross Drilled vs. Slotted Rotors

[spk282]

I recently read an article online about cross drilled and slotted rotors warping faster then regular rotors because they cool down faster then a normal rotor causing it to warp. Anyone know of any truth behind this? If not, which rotor out performs the other if at all and what brands might you recommend?

[GTPCatz]

Drilled rotors are not a good idea...they tend to crack around the holes.
If you want holes in your rotors have them cast that way...but then thats a little extra $$$$$$

as far as slotted warping faster....again you get what you pay for...I think Cheaper rotors would but if you pay enough for a good set they will last you awhile

[Igovert500]

The quote below is from Tom Wilson's Technical Correspondence column in the March 2003 issue of Road & Track magazine.

" Assuming minimal attention to where the holes are drilled, there is no meaningful difference between cast-in and drilled-in holes in rotors. ... The real difference is between drilled and non-drilled rotors. All those holes detract from a rotor's mass, and high mass content is a main ingredient in avoiding warping. As for cracking, all rotors will crack if overheated, and there is little difference between drilled and non-drilled rotors in that regard.
Cosmetics is why most rotors are drilled nowadays -- the old gassing problem that holes are supposed to address is negligible with good pads and all but absurdly flamboyant street driving -- so, many aftermarket brake tuners offer rotors with or without drilling to suit demand."

Taken from stealth316.com