HELP! Which directions slotted/drilled rotors go on? (PICS)
07-20-2006, 09:25 AM
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HELP! Which directions slotted/drilled rotors go on? (PICS)
Just starting my BBK install and was wondering...
Which side is passanger and which is driver?? I'm a little confused..
Which side is passanger and which is driver?? I'm a little confused..
Last edited by maximumsportZ; 07-20-2006 at 09:29 AM.
07-20-2006, 09:37 AM
#2
Which direction should the discs rotate?
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are three vane types in use:
Straight
Pillar vane (comprised of many small posts)
Curved vane
The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Please see figure. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc's ability to dissipate heat.
Additionally, all of Brembo's slotted discs are directional as well, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first. Please see figure.
It is a popular misconception that the slots or drillings in a disc determine the direction of rotation. In truth, for an internally vented disc, the geometry of the vanes dictates the direction of rotation. There are three vane types in use:
Straight
Pillar vane (comprised of many small posts)
Curved vane
The first two vane types are non-directional, and can be used on either side of the vehicle. The curved vane disc, however, is directional. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Please see figure. Orienting the disc in the manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc's ability to dissipate heat.
Additionally, all of Brembo's slotted discs are directional as well, regardless of the vane geometry. The discs should be installed such that the end of the slot nearest the outer edge of the disc contacts the pad first. Please see figure.
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07-20-2006, 09:55 AM
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Ok snapped some pics on top of the rotor of the cooling fins.
Left rotor from above pic:
Right rotor from above pic:
So what I have been told, the fins have to face to grab cool air..
Left rotor from above pic:
Right rotor from above pic:
So what I have been told, the fins have to face to grab cool air..
07-20-2006, 10:11 AM
#11
Vendor - Former Vendor
What brake kit are you installing? Curved cane rotors are usually designed so that when installed the internal vanes will be sweeping rearwards at the top of the rotor. The slot or drill pattern does not affect performance and should not be used to determine correct rotor orientation unless specified by the manufacturer.
Here is how our rotors are to be installed:
http://8.7.96.35/tech_info/faqs.shtml#16
Here is how our rotors are to be installed:
http://8.7.96.35/tech_info/faqs.shtml#16
Last edited by StopTech; 07-20-2006 at 10:13 AM.
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07-20-2006, 10:13 AM
#13
Originally Posted by StopTech
What brake kit are you installing? Curved cane rotors are usually designed so that when installed the internal vanes will be sweeping rearwards. The slot or drill pattern does not affect performance and should not be used to determine correct rotor orientation unless specified by the manufacturer.
Here is how our rotors are to be installed:
http://8.7.96.35/tech_info/faqs.shtml#16
Here is how our rotors are to be installed:
http://8.7.96.35/tech_info/faqs.shtml#16
thats weird.. becaues it appears you have your fin's facing the rear of the car... wouldn't it be wise for the fin's to face the front of the car? that way it picks up air from the front as it rotates counter clockwise?
07-20-2006, 10:15 AM
#14
Vendor - Former Vendor
The rotors act as a centifugal fan to pump air from the hub outward to the outer edge of the rotors. If you look at brake ducting systems, they supply fresh cool air to the center of the hub to pull cold air through the rotor.
07-20-2006, 10:22 AM
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Originally Posted by StopTech
Dont worry about slot direction. Focus on internal vane direction as it is the important factor.
07-20-2006, 10:24 AM
#18
so basically you are saying.. the fins/vanes should be facing the front of the car when installed?
because i was thnking the vane's should face the rear.. that way when the wheel is spinning counter clockwise.. while the vanes are turning they are pickign up air from the front of the car...
but you are the brake expert so i will go with what you say
because i was thnking the vane's should face the rear.. that way when the wheel is spinning counter clockwise.. while the vanes are turning they are pickign up air from the front of the car...
but you are the brake expert so i will go with what you say
07-20-2006, 11:10 AM
#19
Vendor - Former Vendor
That is not what I have said at all, please reread my posts. The internal vanes of the rotor should be sweeping rearward at the top of the rotor.
Maximum, I am not sure by the picture you posted if I am looking at the inside or ouside of the rotor so I cant say for sure which side it is for. From what I can tell, it would seem that the rotors when mounted on the car will have both the internal vanes and slots/drills slanting rearward at the top of the rotor.
Maximum, I am not sure by the picture you posted if I am looking at the inside or ouside of the rotor so I cant say for sure which side it is for. From what I can tell, it would seem that the rotors when mounted on the car will have both the internal vanes and slots/drills slanting rearward at the top of the rotor.
