Cross Drilled rotors

[Doug Waschenko]

One of the manufacturers is saying that they just do cross drilling of the rotors and will not slot street use rotors.
They say that slotting is only good for race cars because it cuts the brake pad life in half.
Does anyone have experience with this? What problems have you had with cracked rotors from the cross drilling?

 

[Mr Anonymous]

I would disagree 180 deg. from what they said. Cross drilled rotors crack too easily IMHO, and I've never seen a slotted (only) rotor fail. I want to say that I've never seen a drilled rotor that didn't crack from the holes, and in a few cases have caused the rotor to fracture.

Powerslot rotors, while pricey, have kept those customers or ours who've requested a slotted rotor very happy. We just had one customer's rotors resurfaced with over 20K miles on them and no cracks or warping.

 

[SHOguy 92]

What I have hard about drilled is like said they break, haven't heard much about slotted except for the fact that there is lesss to grab seeing as some surface is ressed. So unless you really need the cooling forget it. I wonder if cyroing would help with drilled rotors?

 

[DHMag]

What I have hard about drilled is like said they break, haven't heard much about slotted except for the fact that there is lesss to grab seeing as some surface is ressed. So unless you really need the cooling forget it. I wonder if cyroing would help with drilled rotors?

cryo treating does help with solid rotors. after seeing stock rotors drilled and slotted with NUMEROUS cracks, i recommend only purchasing rotors that are already drilled and slotted, if you feel so inclined. if i had a choice, id purchase either Powerslot rotors or EBC slotted/dimpled rotors(with EBC Greenstuf pads)

slotted rotors are slotted to allow accumulated gases and heat to escape faster. with 2 flat surfaces facing each other, there isnt any place for the gas, dust, or heat to release. most performance pads on the market now are actually 2 pads on one backing plate.

 

[Todd TCE]

The combo of drilling and slotting is pure marketing. There was no such thing until the industry hit on it (the bling-bling aftermarket industry) a few years ago. With the great marketing hype some companies put on it (if ONE is good then BOTH just MUST be BETTER) nearly everyone does it now. Myself included. But not for any type of performance- only appearance.

One eats pads faster than the other? How? Explain that one. The surface is cut and compromised by either holes, dimples, slots, whatever. This is simply a different take on a cheese grator over the pad. Both eat pads. That's part of their benefit- cleaned pads.

I'd not lose any sleeep over which ones you get. But if holes are in them you'll take life from them that much is certain.

 

[SHOspazz92]

The Rotors on my 96 Are cross-drilled and are doing quite nicely....Only thing is, The car was only tracked really hard once, and that was when Motor Trend tested it. For now it Has a few hard runs through the twisties...and other then that is driven like your normal Daily driver. Because of this, My Rotors are showing only Tiny little cracks where they are drilled...But I have only counted 6 cracks all together On Both Rotors.

The rear ones Are Both Slotted and cross-Drilled, Its the stock Rear Rotors...Those ones are doing just fine...Well...Because obviously they dont take the load the front ones do

 

[Shoaz]

Watch those cracks closely. Just make sure that they don't propagate across the rotor. A rotor failure is a bad thing, any time, any where.

 

[SHOspazz92]

Watch those cracks closely. Just make sure that they don't propagate across the rotor. A rotor failure is a bad thing, any time, any where.

Yes, Definently will do that