Drilled/Slotted
09-26-2010 | 05:37 PM
#22
TECH Senior Member
Joined: Jan 2004
Posts: 5,799
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From: St.Charles MO
SO none of the following are real road race cars?
911 GT3 Cup:
http://seriouswheels.com/pics-2010/n...-1600x1200.jpg
Corvette ZR1 GT2 car (steel brakes):
http://www.auto-power-girl.com/photo...2-2010-20.jpeg
M3 GTR Cup Car:
http://www.7extrememotorsports.com/l...-m3-gtr-05.JPG
Somebody must be confused here, and I kinda doubt it's the race teams with millions of dollars invested in engineering and R&D...
911 GT3 Cup:
http://seriouswheels.com/pics-2010/n...-1600x1200.jpg
Corvette ZR1 GT2 car (steel brakes):
http://www.auto-power-girl.com/photo...2-2010-20.jpeg
M3 GTR Cup Car:
http://www.7extrememotorsports.com/l...-m3-gtr-05.JPG
Somebody must be confused here, and I kinda doubt it's the race teams with millions of dollars invested in engineering and R&D...
From Stoptech:
Which is better, slotted or drilled rotors?
StopTech provides rotors slotted, drilled or plain. For most performance applications slotted is the preferred choice. Slotting helps wipe away debris from between the pad and rotor as well as increasing the "bite" characteristics of the pad. A drilled rotor provides the same type of benefit, but is more susceptible to cracking under severe usage. Many customers prefer the look of a drilled rotor and for street and occasional light duty track use they will work fine. For more severe applications, we recommend slotted rotors.
StopTech provides rotors slotted, drilled or plain. For most performance applications slotted is the preferred choice. Slotting helps wipe away debris from between the pad and rotor as well as increasing the "bite" characteristics of the pad. A drilled rotor provides the same type of benefit, but is more susceptible to cracking under severe usage. Many customers prefer the look of a drilled rotor and for street and occasional light duty track use they will work fine. For more severe applications, we recommend slotted rotors.
Q: Why are some rotors drilled or slotted?
A: Rotors are drilled to reduce rotating weight, an issue near and dear to racers searching for ways to minimize unsprung weight. Drilling diminishes a rotor's durability and cooling capacity.
Slots or grooves in rotor faces are partly a carryover from the days of asbestos pads. Asbestos and other organic pads were prone to "glazing" and the slots tended to help "scrape or de-glaze" them. Drilling and slotting rotors has become popular in street applications for their pure aesthetic value. Wilwood has a large selection of drilled and slotted rotors for a wide range of applications.
A: Rotors are drilled to reduce rotating weight, an issue near and dear to racers searching for ways to minimize unsprung weight. Drilling diminishes a rotor's durability and cooling capacity.
Slots or grooves in rotor faces are partly a carryover from the days of asbestos pads. Asbestos and other organic pads were prone to "glazing" and the slots tended to help "scrape or de-glaze" them. Drilling and slotting rotors has become popular in street applications for their pure aesthetic value. Wilwood has a large selection of drilled and slotted rotors for a wide range of applications.
C6R:
Zonda R:
Porsche OEM rotor:
09-27-2010 | 02:45 PM
#25
There you go. JD AMG's post shows it all right there. I'm not used to posts that have evidence to support an idea around here on ls1tech, so lets wait a little bit before someone else provides more. You're going to give me a heart attack, lol
Did the OP even change his rotors after they warped??? Have you checked them for little cracks?
Did the OP even change his rotors after they warped??? Have you checked them for little cracks?
09-27-2010 | 02:48 PM
#26
09-27-2010 | 03:26 PM
#28
On The Tree
Joined: Jun 2009
Posts: 142
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From: Derry, NH
09-27-2010 | 05:38 PM
#29
And we know the Z06 is the end all.... I mean there must be some reason they have one front rotor directionally vaned---THE WRONG WAY. Funny how few folks actually know that. 
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www.stranoparts.com --814-849-3450
Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
09-27-2010 | 07:26 PM
#30
On The Tree
Joined: Jun 2009
Posts: 142
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From: Derry, NH
That was the first thing I noticed when I unboxed them! Oh hey look the vanes are directi..... Oh they are both the exact same 
10-21-2010 | 03:04 PM
#31
those are pics of carbon rotors. a little different game then they are talking about
10-21-2010 | 04:13 PM
#32
Cross-drilling has nothing to do with cooling the rotor - that's what the vanes in the center of the rotor are for - let alone decreasing warpage. Cross-drilling removes rotor mass, which removes heatsink mass, which means the rotors heat up faster, causing a much increased chance of warping, and the holes create stress points during heat cycling, causing cracks.
Cross-drilled and slotted aren't "useless" as in not functional - they simply provide absolutely no benefits, at all, for a car running anything approximating brake pads that are safe to use on the street, and honestly, I don't even think race pads outgas enough to warrant cross-drilled rotors anymore.
Why do so many road-race guys use blanks if the "big-name performance cars" come with cross-drilled rotors?
Cross-drilled and slotted aren't "useless" as in not functional - they simply provide absolutely no benefits, at all, for a car running anything approximating brake pads that are safe to use on the street, and honestly, I don't even think race pads outgas enough to warrant cross-drilled rotors anymore.
Why do so many road-race guys use blanks if the "big-name performance cars" come with cross-drilled rotors?
The holes in rotors are either form being drilled or if the rotor is cast with them in. Brembo, Willwood an the other big names have the rotors cast, not drilled. Hence the price difference and more importantly, the performance difference when pushed hard. The drilling weakens the rotor and under extreme conditions, the rotor can fail as stated by many.
I've been road racing at Road America since 97 and that track will murder brakes faster then anything. I know, I've seen more than my share of wrecks due to brakes failing. Going into turn 5 at that track (in traffic) I'm reeling the car down from 145 to 40 in a few hundred feet... lap after lap, and thats just 1 turn of its 14- theres no way in HELL I'm rolling the dice w/ 2nd rate anything. Matter of fact, in several of the events I help organize and do tech in, we do not allow drilled rotors on the track. Blanks, slotted or CAST holes is what passes tech.
On the street which is pretty much light and medium duty, one may never notice the difference between a blank or crossdrilled rotor. But... up the braking expectations and get some 'real' heat in the brakes and its gonna show.
Last edited by Heat Seeker WS6; 10-21-2010 at 04:33 PM.
10-22-2010 | 06:13 PM
#33
TECH Senior Member
Joined: Jan 2004
Posts: 5,799
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From: St.Charles MO
