My Latest Odd-Stupid Question
Thread Starter
Instructor
Joined: Jul 2005
Posts: 107
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From: Bolingbrook Illinois
My Latest Odd-Stupid Question
Without getting into a big discusssion on the pros and cons of drilled and slotted brake rotors I need to ask about orientation. Not sure how to ask but should the hole pattern/slots be like a saw blade (on the upperside of the rotor the slots would be pointing towards the front of the car) or the other way around? Does anyone actually understand what I am asking?
Racer
Joined: Jan 2007
Posts: 314
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From: Pittsfield, Ohio
I just installed vbp's double ball milled rotors and their diagram for mounting showed the leading (inner) edge forward of the outer trailing edge of the groove. You basicly want the hot gases to vent to the outside of the rotor as it turns, not pushed towards the hub/bearings. I presume rotors with holes would be the same..
If the groove on the drivers side rotor is at 12 o'clock it should be like this = /
is that what ur asking?
If the groove on the drivers side rotor is at 12 o'clock it should be like this = /
is that what ur asking?
Last edited by 2armor; Mar 26, 2009 at 03:21 PM.
Thread Starter
Instructor
Joined: Jul 2005
Posts: 107
Likes: 0
From: Bolingbrook Illinois
Thats It!
Thats exactly what I was asking; excellent description of the orientation. Makes sense too. That is what I always thought but some car buddies were trying to convince me they should go the other way (perhaps they meant themselves, not the rotors 
).
Thanks !
).Thanks !
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
For normal driving I agree. But for autocrossing etc where your hot on the brakes the venting can add some value. My opinion anyway.
...and they look good!
Drifting
Joined: May 2006
Posts: 1,544
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From: Youngstown Ohio
Just fyi, check drilled rotors in a search, you won't find any of the road racers running drilled or slotted rotors, they concentrate heat and provide weak spots and pathways for cracking. Drilled rotor provide no benefits and fail or fall apart under heavy use....they do look kinda cool though
Le Mans Master
Joined: Sep 2003
Posts: 8,812
Likes: 2,029
From: eastern NC
The slots in the face of the rotor are of little importance regarding how to mount them. Different manufactures orient them differently. What does matter is the orientation of the cooling vanes inside the rotor.
The vanes should be oriented so that they expel air as they rotate. If the vanes are oriented axially (straight from the hub to the perimeter, like spokes in a wagon wheel) then mount the rotors to suit your preference. If the vanes are angled from the hub to the perimeter of the rotor, the rotor should be mounted so that the vanes point to the rear of the car at the top and the front of the car at the bottom. As the car moves forward, the air will be drawn in at the hub and expelled at the outer edge of the rotor.
Good luck... GUSTO
The vanes should be oriented so that they expel air as they rotate. If the vanes are oriented axially (straight from the hub to the perimeter, like spokes in a wagon wheel) then mount the rotors to suit your preference. If the vanes are angled from the hub to the perimeter of the rotor, the rotor should be mounted so that the vanes point to the rear of the car at the top and the front of the car at the bottom. As the car moves forward, the air will be drawn in at the hub and expelled at the outer edge of the rotor.
Good luck... GUSTO
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Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
The slots in the face of the rotor are of little importance regarding how to mount them. Different manufactures orient them differently. What does matter is the orientation of the cooling vanes inside the rotor.
The vanes should be oriented so that they expel air as they rotate. If the vanes are oriented axially (straight from the hub to the perimeter, like spokes in a wagon wheel) then mount the rotors to suit your preference. If the vanes are angled from the hub to the perimeter of the rotor, the rotor should be mounted so that the vanes point to the rear of the car at the top and the front of the car at the bottom. As the car moves forward, the air will be drawn in at the hub and expelled at the outer edge of the rotor.
Good luck... GUSTO
The vanes should be oriented so that they expel air as they rotate. If the vanes are oriented axially (straight from the hub to the perimeter, like spokes in a wagon wheel) then mount the rotors to suit your preference. If the vanes are angled from the hub to the perimeter of the rotor, the rotor should be mounted so that the vanes point to the rear of the car at the top and the front of the car at the bottom. As the car moves forward, the air will be drawn in at the hub and expelled at the outer edge of the rotor.
Good luck... GUSTO
Here are a couple pictures of the 2009 corvette rotors.
Last edited by 63mako; Mar 26, 2009 at 10:07 PM.
Racer
Joined: Jan 2007
Posts: 314
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From: Pittsfield, Ohio
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Last edited by 63mako; Mar 27, 2009 at 02:25 PM.
Race Director
Joined: Jul 2001
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Melting Slicks
Joined: Apr 2005
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Safety Car
Joined: Apr 2007
Posts: 4,435
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From: Kalamazoo Mi
the z06 rotor is for show
that carbon ZR1 rotor is a different story, outgassing is a problem with the rotors themselves.
also, some race teams do it for driving in the wet, so the steam can escape.... mostly it looks cool though