View Full Version : Which diection do the brake rotor vanes go?
UrS6
August 14th, 2017, 15:48
I have new rotors and I'm not sure which one is left and which one is right. Do the vanes scoop air from the outside and force them toward the hub? Or does the air go from the hub to the outside of the rotor? The rotors that are on the car right now are not directional. So that won't help me figure it out.
nubcake
August 16th, 2017, 00:12
From the inside and out.
EDIT: also do phaeton ducts (https://www.audiworld.com/tech/wheel60.shtml) while you're there.
Aronis
August 16th, 2017, 01:55
18193
they are oriented with the openings facing the front top so as the rotor turns forward it scoops air into the space between the disks.
nubcake
August 16th, 2017, 02:19
Mike, your rotors are backwards (https://www.cquence.net/media/wysiwyg/cooling-vein-orientation.jpg). :)
UrS6
August 16th, 2017, 02:29
It seems counterintuitive but I'd imagine the low pressure created around the outside perimeter of the rotor would be the way. It would pull air outward? But I don't know.
nubcake
August 16th, 2017, 02:35
It seems counterintuitive but I'd imagine the low pressure created around the outside perimeter of the rotor would be the way. It would pull air outward? But I don't know.
This.
+"centrifugal" force.
Aronis
August 16th, 2017, 20:26
If I recall, they were marked, so I'll have to pop a wheel and look.
LOL
Mike
UrS6
August 17th, 2017, 03:41
I asked the googles about directional rotors in general and they concur with Nubcakes.
Aronis
August 19th, 2017, 00:07
Here is my set up. These are Drivers Side.
18194
18195
The Passenger side is also with markers but the mirror image. I did not take photos of that side. Now I don't know what the innards are set to but I know I put them on correctly as they were marked and the old ones were marked. Who has unmarked rotors?
Mike