Originally Posted by new_dharma
wrong...wrong...wrong!
drilled and slotted rotors actually run hotter than a comparable vented rotor...the rotors are used as a heat sink to move the heat created in braking AWAY from the calipers. the more heat that ISN'T moved, the hotted the brake fluid becomes, and as the brake fluid heats up IT becomes less effective. by drilling and slotting the rotor you decrease the amount of metal the rotor has, lowering its mass and creating a smaller heat sink.
the holes are [were???]to remove gasses from between the pad surface and the rotor surface, which isn't a big deal these days. The pad materials that are used create very little gas anymore (unless you buy VERY CHEAP pads, but then why buy slotted rotors!?!)
the main reason for the slots are used to remove the glaze on pads (and clean, i guess)...but here again, we have a problem...where does all the material go that's being scraped off? into the holes.
ok, i'm done for now...
and all over your nice shiny rims! lol yeah, ok this thread isn't going the direction i'd hoped, i mean we're arguing about what purpose the slots and holes serve on a
CAR, but i'm doing this on my bike, so lets get back to that, anybody done this? somebody a little back mentioned taking an angle grinder to the rim, i figure i'll do that, just clamp the axle in a vice (with wood blocks, i don't want to damage my threads) and have my brother or someone rotate the wheel slowly while i grind (lightly) outward from the center across the rim. i figure i don't really need slots or holes, but it would be beneficial to have a surface that increases the resistance to the pad moving across the surface. i'll update when i can, i've gotta work 4pm to about 10:30ish, so after that i'll be workin all night.
see ya'll than!