TomQ

Why ya'll talking **** about cross drilled and sloted rotors?

Did you personally have any problems with cross-drilled and/or slutted rotors?

If Yes, What brand were they? Under what circumstances?

I'm confused, if they are so bad why all exotics and well-known brake companies make them?
<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

<small>[ February 06, 2003, 06:56 PM: Message edited by: TomQ ]</small>

98_1LE

iTrader: (17)

I am not bad mouthing them, I use them for daily driver rotors. But, I do not beleive they stop any faster, prevent fade or any other magical effect. I think Baer and other companies drill rotors to help sell them. They only need to apply enough force to lock the wheel or activate the ABS, which the stock brakes will do with street tires.

BlackBird55

iTrader: (1)

Drilled/Slotted rotors do not benefit street cars. They were developed for track/rally cars that are very abusive on brakes. When used on street cars they can actually have a detrement to performance in the way of less surface area and the fact that the features leave a convenient path for a crack to propagate along.

TomQ

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BlackBird55:
<strong> Drilled/Slotted rotors do not benefit street cars. They were developed for track/rally cars that are very abusive on brakes. When used on street cars they can actually have a detrement to performance in the way of less surface area and the fact that the features leave a convenient path for a crack to propagate along. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">so, how many rally cars had their brakes crack in the middle of a race?
If the rotors were design to be abused, why should they crack under street driving conditions?

AZ28driver

Tom the answer lies in how the rotor was manufactured. If a normal rotor was "drilled" to put the holes in it that rotor has a greater chance of cracking then one that came out of a mold that has previsions for the holes. The has to do with the molecular structure of the metal and the likelihood of you drilling on either side of a weak spot that will cause the rotor to crack when heated. For street applications I'd have to agree with most people and say the stock brakes are just fine. Slotted and drilled rotors do have less surface area for the pad to grab but they have the benefit of dissipating heat (and water that can get trapped between the pad and rotor) a lot faster than a standard rotor so there is less a chance of brake fade. Keep in mind though to get a substantial amount of fade you are going to have to do probably 3 or more panic stops from 60 mph. What's the likelihood of you doing that in your everyday driving. My Personal opinion on warped rotors...while I will concede that heat has a lot to do with it I also think people putting tires on with impact guns and over tightening the lugs also has a lot to do with it. Just my 2 cents worth.

BlackBird55

iTrader: (1)

AZ28Driver covered most of it. One thing that rally cars will do is have the rotors cryogenically treated. This helps reduce surface cracking. Some touring cars use composite rotors, some rally cars have liquid cooled calipers to disapate the heat. Here is a webpage that covers both sides of the arguement.

web page

TomQ

alright, i think i'll see what's the difference between my stock brake system and baer claw system (crossdrilled/slotted/zink washed/deep cryogenically treated rotors)

i also see how fast they will crack <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> <img border="0" alt="[punch]" title="" src="graemlins/gr_punch.gif" />


Thanks guys, i'm just trying to learn, good info on the link you gave

BADZ

iTrader: (5)

I can tell you this, You buy the Baer system an install them to you car and you will not have to worry about your brakes for along time as most of us are very hard on our daily driving brakes so whether your at the track or just regular daily driving on the street, you will definitely agree that the cross drilled/slotted rotors will be the ticket for a long lasting braking system for years to come!!!!! <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

<small>[ February 07, 2003, 05:51 PM: Message edited by: BADZ ]</small>

98_1LE

iTrader: (17)

BADZ gets an award for the longest sentence ever...

deviate42

iTrader: (2)

I take my bimmer to the track weekly (i hope <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> ) and after 4 yrs, the fronts and starting to crack. I drive this car very hard and i demostrate with it so i am not surprised by this.
I dont think you have anything to worry about with a street car.
I am replacing my drilled/sloted with just slotted.
now or this next year, CART, F1, and indy cars are all going sloted(not crossdrilled/slottd)..so i guess thats enough to hook me <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

White Fire

I think Baer rotors have a lifetime warranty against crackng/warping <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

2002SilverWS-6

iTrader: (4)

I guess nobody has heard of 300 Below.

TomQ

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 2002SilverWS-6:
<strong> I guess nobody has heard of 300 Below. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">300below.com - that's where i cryo-treated my baer rotors <img border="0" alt="[evil]" title="" src="graemlins/gr_devil.gif" />

BlackBird55

iTrader: (1)

www.frozenrotors.com
is another one that most of the rally guys use.

LG Motorsports

We used Drilled and slotted rotors on our race cars until they were banned. They stopped as well as anything, and the drilled pattern gave a built in "Modulation". You could feel it in the pedal. They are lighter, and the benefits of the drilled holes outweighs the loss of surface area. The holes also give more surface area to get rid of heat.
The sanctioning body banned them for cost reasons. The drilled rotors did not last as long as non drilled. They were lighter, but the holes did provide a starting point for cracks.
If you have drilled rotors, you can hear the "buzz" as the pads ride over the holes.

So in summary, For street driving, there is no down side to drilled rotors.
For Track use, they would be my choice, if budget were not an issue.
If $$ is an issue, then use slotted only for the race track.

NO rotor will last forever without cracking. Every rotor, on the race track, WILL crack. If you use less agressive pads, you will see longer life from a rotor, but if you use Blues or PFC 01s, you will stop faster, and the energy created will shorten the life of the rotors. Cryo, and heat treating etc spend extra $$ and the rotors still will crack. Maybe just a little later, but they will still crack.

Rotors are a consumable, just like pads. So carry extra front rotors to a track day.

Lou Gigliotti LGM

BlackBird55

iTrader: (1)

Thanks Lou, good to hear the word of an experienced professional. Funny you mentioned Hawk Blues. I've got a rotor off my Neon that shows what they are capable of.