Mark VII Vented Rotors, Directional?

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Mark VII Vented Rotors, Directional?

April 21, 2007, 01:18:59 PM

Assembling my Mark VII brakes to get the 8.8 ready to install I noticed something I wasn’t aware of. Doing the second side I noticed the Vents in the Rotors are directional. I always assumed they were just straight through the rotor but they are not. AND there not the same from left to right side.
Stand the rotors side by side facing the same way and place a screw driver down the vents and one of these screw drivers points left and the other point’s right. I searched the forums and found nothing on this. But I did find this thread look at Post #6 by Ether947 picture #2 and you can see there not straight through.

These Rotors are from a 84 Mark VII and I can only assume stock.
I searched them front and back and can find no “Left” or “Right” indicator “L” or “R” nothing. Not even a part number.
When I ordered the front Rotors from Richard there was no left or right option. And I didn’t check the fins on those rotors. (Of course not, Murphy’s Law dictates I would find this on the installation of the LAST of 4 rotors)

SO.. since they are Directional what way SHOULD they be facing

[html]Direction #1
Front \\\ Rear
of O of
Car \\\ Car[/html]

[html]Direction #2
Front /// Rear
Of O of
Car /// Car[/html]

I would think Direction #1 is the way the SHOUD be. If nothing else because Murphy is an ASS and mine are installed in direction #2

Mark VII Vented Rotors, Directional?

Reply #1 – April 21, 2007, 02:02:02 PM

I would actually think direction #2 would be the way, if nothing else but that would make you have to take 'em off again :D

Joking apart, I really do think direction #2 would be the way. Spinning in that direction they would draw air in at the center and "fling" it out at the edges, which would be easier to do because the air wouldn't be fighting centrifugal force. Spinning in the direction you show in #1 would result in the rotors grabbing air around the edges and forcing it out at the center which would be much harder and far less efficient (if it even worked at all)

Mark VII Vented Rotors, Directional?

Reply #2 – April 21, 2007, 09:06:36 PM

I just looked at my baer rotors (there directional too) and the vanes face forward. Meaning if you were to stick your screwdriver down em it would point to the left. This is what was stamped on em and I can only assume that maybe it helps force air through the rotor faster for more efficient cooling. Hope that helps.