Cross drilled rotors
04-03-2003 | 02:03 PM
#16
Burning Brakes
Joined: Aug 2002
Posts: 1,019
Likes: 0
From: Monterey, CA
Anyone seen a brake rotor on a race car lately (as in the last 20 years)? Are they slotted / cross-drilled? No.
Cross-drilled rotors offer no better resistance to fade and certianly no better braking power. I would agrue that you probably are slightly INCREASING (only very slightly though) your chances of fade. You are actually reducing the amount of braking surface available to absorb heat.The venting in-between the friction surfaces does allow for better cooling however. At any rate, the only benefit cross-drilling offers is to (someone already quoted the Porsche website) increase braking ability in the wet. The holes do allow water to escape through them keeping the braking surface dry.
Unfortunately, there is a huge downside to cross-drilling your rotors. The biggest of those benig you are significantly increasing your chances of cracking the rotors. It is highly unlikely that you would ever produce the kind of braking conditions needed to crack even a cross-drilled rotor on the street. But it is possible. The largest problem would occur at a drivers ed or autocross event. The chances here are much higher. You are always reducing pad life most likely. However, I have no direct knowledge of this. Hell, even Brembo calls cross-drilling a "COSMETIC UPGRADE".
Cross-drilled rotors offer no better resistance to fade and certianly no better braking power. I would agrue that you probably are slightly INCREASING (only very slightly though) your chances of fade. You are actually reducing the amount of braking surface available to absorb heat.The venting in-between the friction surfaces does allow for better cooling however. At any rate, the only benefit cross-drilling offers is to (someone already quoted the Porsche website) increase braking ability in the wet. The holes do allow water to escape through them keeping the braking surface dry.
Unfortunately, there is a huge downside to cross-drilling your rotors. The biggest of those benig you are significantly increasing your chances of cracking the rotors. It is highly unlikely that you would ever produce the kind of braking conditions needed to crack even a cross-drilled rotor on the street. But it is possible. The largest problem would occur at a drivers ed or autocross event. The chances here are much higher. You are always reducing pad life most likely. However, I have no direct knowledge of this. Hell, even Brembo calls cross-drilling a "COSMETIC UPGRADE".
04-03-2003 | 02:20 PM
#18
Geaux Tigers!
Rennlist Member
Rennlist Member
Joined: Jun 2001
Posts: 9,037
Likes: 41
From: Louisiana
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Porsh-uh dammit:
<strong>Anyone seen a brake rotor on a race car lately (as in the last 20 years)? Are they slotted / cross-drilled? No.
Cross-drilled rotors offer no better resistance to fade and certianly no better braking power. I would agrue that you probably are slightly INCREASING (only very slightly though) your chances of fade. You are actually reducing the amount of braking surface available to absorb heat.The venting in-between the friction surfaces does allow for better cooling however. At any rate, the only benefit cross-drilling offers is to (someone already quoted the Porsche website) increase braking ability in the wet. The holes do allow water to escape through them keeping the braking surface dry.
Unfortunately, there is a huge downside to cross-drilling your rotors. The biggest of those benig you are significantly increasing your chances of cracking the rotors. It is highly unlikely that you would ever produce the kind of braking conditions needed to crack even a cross-drilled rotor on the street. But it is possible. The largest problem would occur at a drivers ed or autocross event. The chances here are much higher. You are always reducing pad life most likely. However, I have no direct knowledge of this. Hell, even Brembo calls cross-drilling a "COSMETIC UPGRADE".</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Well said. Anyone running Cryo. rotors?
<strong>Anyone seen a brake rotor on a race car lately (as in the last 20 years)? Are they slotted / cross-drilled? No.
Cross-drilled rotors offer no better resistance to fade and certianly no better braking power. I would agrue that you probably are slightly INCREASING (only very slightly though) your chances of fade. You are actually reducing the amount of braking surface available to absorb heat.The venting in-between the friction surfaces does allow for better cooling however. At any rate, the only benefit cross-drilling offers is to (someone already quoted the Porsche website) increase braking ability in the wet. The holes do allow water to escape through them keeping the braking surface dry.
Unfortunately, there is a huge downside to cross-drilling your rotors. The biggest of those benig you are significantly increasing your chances of cracking the rotors. It is highly unlikely that you would ever produce the kind of braking conditions needed to crack even a cross-drilled rotor on the street. But it is possible. The largest problem would occur at a drivers ed or autocross event. The chances here are much higher. You are always reducing pad life most likely. However, I have no direct knowledge of this. Hell, even Brembo calls cross-drilling a "COSMETIC UPGRADE".</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Well said. Anyone running Cryo. rotors?
04-03-2003 | 03:57 PM
#20
Drifting
Joined: Jan 2002
Posts: 3,316
Likes: 190
From: Edmonton AB
<img src="http://www3.us.porsche.com/english/usa/911/gt2/safety/bilder/pccb_foto1.jpg" alt=" - " />
The new ceramic brakes are drilled... Why does Porsche put drilled rotors on their cars now? Just for the wet?
The new ceramic brakes are drilled... Why does Porsche put drilled rotors on their cars now? Just for the wet?
04-03-2003 | 04:00 PM
#21
Race Director
Joined: May 2002
Posts: 13,634
Likes: 1
Was just going to ask that ^
Why would their top-of-the-line brakes be drilled then? Big Reds, the ceramics, they're both drilled. IIRC the brakes on the Carrera GT are drilled too. If they are useless or even hinder performance, why use them? Marketing gimick? Flashy looks? (cross-drilled rotors do look better)
Why would their top-of-the-line brakes be drilled then? Big Reds, the ceramics, they're both drilled. IIRC the brakes on the Carrera GT are drilled too. If they are useless or even hinder performance, why use them? Marketing gimick? Flashy looks? (cross-drilled rotors do look better)
04-03-2003 | 04:04 PM
#22
Addict
Rennlist Member
Rennlist Member
Joined: Aug 2002
Posts: 1,941
Likes: 1
From: Kalifornyuh
Danno
. . . So what was the final assessment of the Altima thread? It loos like there is no real answer and after 13 pgs., I got tired of the sarcasm and skipped to the end. No real conclusion. . .
. . . So what was the final assessment of the Altima thread? It loos like there is no real answer and after 13 pgs., I got tired of the sarcasm and skipped to the end. No real conclusion. . .
04-03-2003 | 04:09 PM
#23
Addict
Rennlist Member
Rennlist Member
Joined: Feb 2002
Posts: 2,131
Likes: 22
From: Churchville, MD
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by ELLSSUU:
<strong> Well said. Anyone running Cryo. rotors?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I'm trying some now. Just OEM rotors treated by diversified cryogenics. They should last longer than regular stockers, not enough time to gauge this yet.
<strong> Well said. Anyone running Cryo. rotors?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I'm trying some now. Just OEM rotors treated by diversified cryogenics. They should last longer than regular stockers, not enough time to gauge this yet.
04-03-2003 | 04:17 PM
#24
Race Director
Joined: May 2002
Posts: 13,634
Likes: 1
BTW, I liked this comment:
"2. The average Porsche owner buys it to soothe his ego, not to drive it vigorously. Most Porsche owners meet the requirements to be considered a boulevard pimp. If you too are a boulevard pimp, then by all means, get the blingiest rotors you can find."
<img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />
"2. The average Porsche owner buys it to soothe his ego, not to drive it vigorously. Most Porsche owners meet the requirements to be considered a boulevard pimp. If you too are a boulevard pimp, then by all means, get the blingiest rotors you can find."
<img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />
04-03-2003 | 05:04 PM
#25
Addict
Rennlist Member
Rennlist Member
Joined: May 2001
Posts: 2,099
Likes: 7
From: A suburb of Silicon Valley, CA
All the top performing Porsches come from the factory with vented disks.
Who do you trust more.....a lunatic on a Nissan web site or the engineers at Porsche.
Bling Bling, they can bite my rotor.
Who do you trust more.....a lunatic on a Nissan web site or the engineers at Porsche.
Bling Bling, they can bite my rotor.
04-03-2003 | 05:33 PM
#27
Race Director
Joined: May 2001
Posts: 10,862
Likes: 34
From: Indianapolis, IN
btw..this is the quote of thread:
"
a)They rock
b)They look awesome
c)NO SQUEALING, NONE, NONE, WHATSOEVER NO SQUEALING
d)Did I tell you they look awesome
e)Increased stopping power
"
LOL!
"
a)They rock
b)They look awesome
c)NO SQUEALING, NONE, NONE, WHATSOEVER NO SQUEALING
d)Did I tell you they look awesome
e)Increased stopping power
"
LOL!
