Crossdrilled or Not?

[speedminded]

1 Find me proof that cross drilled rotors cool better. When you drill a rotor you lose mass, that mass is what absorbs and dissipates heat from the brake system. Taking mass out of the rotors isn't going to make them work better.

2 If you are going to the track you shouldn't be worried about how they look.

3. Have you done any track days? Regardless of how cheap the pads are you don't want to have to change them at the track if you can avoid it. Keep in mind that you wont be using stock pads at the track you will probably be on something similar to a Hawk hp + or Hp 1 and those aren't cheap.

4. Check out Coleman Racing they generally have better prices on blank rotors. They will also custom machine hats for you if need be. I have a very similar setup on my 240 track car. I ended up with slotted rotors because at the time that's all they had. Ill post up some of the links I have and you can decide for your self if you really want drilled rotors.

2. How do you know that you want your rotors to cool better.( what you actually want is for your rotors to stay in a certain temperature range so that they work effectively.

Both our Honda Challenge cars, all 3 of our Formula Mazda's, and Pro Formula mazda use plain face/blank rotors. i'm not arguing whether cross drilled is better or not...I just see them used in race applications and on nearly every motorcycle produced. Why i ask? I can understand for looks on a bike but what about $750,000-1,000,000 race cars? Are their crew members and engineers just as confused as i am? I would hope not.

Mass only dissipates heat because it has more exposed surface area. Why wouldn't a heat sink just be made as a simple square block if that wasn't true? BUT to go with your theory, it obviously takes less time to heat up less mass (a smaller pot of water will boil faster)...so by drilling holes or cutting slots then the rotor in theory it will heat up faster because there is less mass...BUT that resorts back to my theory on more exposed surface area means more heat dissipation...So would it all equal out at the end?

I can't access h-t from work so someone may have already done this on there but all the math and science in the world means nothing to most without putting it to test. I'll personally put a crossdrilled rotor on one side and a plain face on the other and test it myself. I'll use heat paint and a pyrometer to get the results and we'll see if in fact there is any and what differances. That's the only way.

In a 12 or 13 hour endurance race we'll go through 2 sets of hawk/carbotech race pads with the exact same brake setup using plain faced rotors on a 2,100 lb car (dry weight/del sol). Changing the pads on them couldn't be easier but my car isn't going to see competive racing for quite a while, if ever...I'll just stick with track days and mountain runs :-)

Really the only reason i would go with the crossdrilled is to show it off...i want to produce and market this kit and if it helps sell just 1 setup because it looks good then it's done it's job