which direction do the rotors go if they are slotted.
03-14-04, 07:41 PM
#1
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which direction do the rotors go if they are slotted.
how do you tell from right to left? this is my right rear ( i hope i got it right) kvn
03-14-04, 07:55 PM
#2
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You have it installed correctly. The slots should always "slide down" towards the rear of the car as they approach the Caliper.
03-14-04, 08:00 PM
#3
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****....I don't remember how I put mine on! And the car is at the paint shop so I can't look. This never even crossed my mind cuz I was so busy putting them on.
03-14-04, 09:30 PM
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from brembo.com
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.
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.
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03-14-04, 10:09 PM
#8
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Thanks Vosko....now this is going to eat away at me for 3 weeks while the car is gone! I don't know whether I have more work ahead of me now or not to fix my haste 
Last edited by AMRAAM4; 03-14-04 at 10:13 PM.
03-14-04, 10:16 PM
#9
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Originally posted by vosko
from brembo.com
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.
from brembo.com
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.
03-14-04, 10:54 PM
#11
Originally posted by fd3virgin
thanks vosko. majik the package if from turboimport....i think you mentioned the link to me. the ss lines didn't fit well....i had to trim the screw on the ss line to fit the stock retainer clip. they are stock size rotors. kvn
thanks vosko. majik the package if from turboimport....i think you mentioned the link to me. the ss lines didn't fit well....i had to trim the screw on the ss line to fit the stock retainer clip. they are stock size rotors. kvn
03-14-04, 11:26 PM
#13
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Originally posted by DamonB
Just FYI that on a rotor with curved vanes the slots/holes/dimples will follow the same pattern (unless the guys who made the rotor are boneheads).
Just FYI that on a rotor with curved vanes the slots/holes/dimples will follow the same pattern (unless the guys who made the rotor are boneheads).
The N-Tech kit I have do not have the slots run in the same direction as the vanes. http://members.shaw.ca/bentong/APRacing01.jpg
*** no smart remarks about the upside down calipers, brain fart due to over-excitement upon receiving the stuff ***
03-15-04, 07:00 AM
#14
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Originally posted by HedgeHog
Some are opposite of the internal vanes.
Some are opposite of the internal vanes.
By machining the rotor faces in the same pattern as the internal vanes you can keep the material much more uniform in section throughout its diameter. This makes the stress levels inside the material inherently less as it heats and cools.
03-15-04, 10:01 AM
#15
All the slotted, directionally-vaned rotors I have seen have the slots in the opposite direction as the vanes. Brembo and AP do it that way, so I don't think it is a matter of yokels doing the slots wrong.
I am not sure of the actual reason behind the direction relative to the vanes, but perhaps it is strength. Having the slot across the middle of the vane or the middle of the void could make the rotor weak. Having it go the opposite direction and cross the vanes would seem to be less of a compromise of the rotor structure. You don't plank a deck in the same direction as the support beams; perhaps the same principle applies to rotors.
This is pure speculation, but it seems like it might be a reasonable explanation.
-Max
I am not sure of the actual reason behind the direction relative to the vanes, but perhaps it is strength. Having the slot across the middle of the vane or the middle of the void could make the rotor weak. Having it go the opposite direction and cross the vanes would seem to be less of a compromise of the rotor structure. You don't plank a deck in the same direction as the support beams; perhaps the same principle applies to rotors.
This is pure speculation, but it seems like it might be a reasonable explanation.
-Max
03-15-04, 01:39 PM
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Baer offers this interesting explanation:
"Externally modified Baer rotors employ a REVERSE SLOT or a REVERSE SLOT & DRILL pattern. This is current racecar practice and lowers the potential for "carbon smearing" or "transfer" from the pad material to the trailing side of the slots on the rotor. This is important because in some cases this "smearing" actually affects the rotational balance of the rotor and can cause a "shake" or "nibble" while braking."
"Externally modified Baer rotors employ a REVERSE SLOT or a REVERSE SLOT & DRILL pattern. This is current racecar practice and lowers the potential for "carbon smearing" or "transfer" from the pad material to the trailing side of the slots on the rotor. This is important because in some cases this "smearing" actually affects the rotational balance of the rotor and can cause a "shake" or "nibble" while braking."
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