The slotted and drilled rotors have to do with cooling features and greater grabbing surface. .
I would think the slots would also act like a fan with air moving through the channel to help the cooling of the pad as it passes over each valley IMO.[/quote
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Mike,Ah, but that's not what they are for.
The slots help to "wipe" the rotor/pad contact are of brake dust, water, debris etc. to provide a clean contact area. The slots basically give such material a location to "dump" into.
The drilled holes pay homage to race-type brakes which use pads that off-gas under hard use. Such pads typically are not used on street cars. This is why $10K Porsche 911 brakes have cross-drilled holes, while putting holes in a modern street car is just for looks only. Comparing high-dollar exotic race brakes costing $10K or so, to $50 drilled rotors with street pads is not the same thing. Plus the "correct" drilled brakes are cast with the hols in them which help to releive stresses. Most aftermarket rotors are drilled after the fact.
Brakes use their mass to help distribute heat. When you remove mass (by drilling or slotting), you concentrate the heat in the remaining mass of the rotor. This causes a higher brake rotor temp without the extra material to absorb it. Most hard-core racers use plain-jane blank rotors for racing as they have the bigger mass. Stotted rotors do have their benefit as well, but for the most part drilled rotors are for looks. On a typical weekend-cruiser type of street cars...you won't notice a difference at all if your rotors have slots or holes or nothing at all
Mike,
Yes, the direction where I was going with my vague post about the "greater grabbing surface" was referring to the slots, having to do with cleaning the surface for a better grab.
Drilled you would be correct, for some reason I was thinking "cooling effects". But after I went and looked up the website we purchased from I remembered why we went with the drilled( How I justified the added cost in my head.)
http://marylandspeed.com/build-your...-gt-g8dbahawk-p-2994.html?manufacturers_id=85
But anyways, Mike you are correct. Didn't want to get into detail over my first post, but maybe should have. We went with the drilled and slotted rotors not only for increased stopping power but for the "look."
Tyler
The car will be long gone by then.Like I said earlier, wait until you need to get those cool looking drilled and slotted rotors turned.
I installed slotted/cross drilled on my 91 vert. I don't really think there is much of an advantage if any though. I just like the way they look.