kickaxeguitars
CEG'er
- Joined
- Jul 12, 2007
- Messages
- 67
Do those slotted rotors really work? I think they look cool as hell but are they an improvement over OEM? If not, what is a better choise for performance?
i have drilled and slotted and i can tell you they do nothing other than wear my pads FAST. BUT the rotors are always way cooler than blank rotors. I'm going to go back to blank soon.
The real reason for slotting a rotor is to scrub off the boundary layer (very thin layer of air) between the rotor and brake pad. When the rotor is turning it carries air with it, then when the brakes are applied, this air has to move out of the way in order for the brake pads to start braking. Without slots, the air acts as an air bearing (a pretty good one at that) until the heat from friciton finally boils the air off (yup it happens) and the pads finally touch the rotors.
But at normal running and the speeds even the fastest contour can achieve you would never notice the difference
Just simple physics.
The real reason for slotting a rotor is to scrub off the boundary layer (very thin layer of air) between the rotor and brake pad. When the rotor is turning it carries air with it, then when the brakes are applied, this air has to move out of the way in order for the brake pads to start braking. Without slots, the air acts as an air bearing (a pretty good one at that) until the heat from friciton finally boils the air off (yup it happens) and the pads finally touch the rotors.
But at normal running and the speeds even the fastest contour can achieve you would never notice the difference
Just simple physics.
This entire post is completely and totally wrong. Good god, where did you come up with this from? I mean seriously, can you come up with one single source that would publicly state this? Let alone a credible source? lol.
It depends who you believe and maybe your training, education, and experience. The disc drive in your computer depends on a very good air bearing to 'fly' the head a few microinches above the disc surface. When I worked on disc drives we took great pains to ensure that the air bearing was maintained. The very same forces are at work when a pad tries to come into contact with a rapidly rotating rotor, this sets up an air bearng. Many methods including slotting rotors were designed to collapse the air bearing. In the early 90's some brake manufacturers were using multiple pistons in calipers with the leading edge piston smaller in diameter to increase the pressure at the leading edge of the pad to boil off the boundary layer quicker to reduce the lag between application and hard braking.
Didn't cross drilled rotors come out when asbestos pads were around - I though asbestos pads created gas when they heated up warranting the holes in the rotors to vent off the gases... :shrug: Or I may be just completely off base here...
So what IS the right answer?
It was during that time, yes, but I'm pretty sure the gases weren't from the asbestos itself.
While disc drives now days spin at 5400 and 7200 rpm they are much smaller in diameter than a brake rotor. The velocity at the greater diameter of a brake rotor is similar to the velocity of a disc drive, thus it does create an air bearing. Actually air bearings are set up at relatively slow velocities.