FROM THE BREMBO INSTALLATION MANUAL:

DISC ROTATION DIRECTION
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


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.

(c) 2003 BREMBO

 

As Ayrton pointed out, it's the inside vanes that matter.
The outside can be either way according to the manufacturer.

Without examing the inner vanes it's impossible to tell from
the pictures if they are correct.

I think they are backwards from everything I have seen.
Sorry about that.

Bill, which way are your INTERIOR vanes?
Sweeping out or cutting in?

I think they might work either way, but the long term
heat problems will come later.

Methinks that the "cornfusion" comes over the fact
that we talk about the SLOTS and the VANES with
equal status. The VANES are the important part,
and even though illogical do not FEED air into the
rotor, but exhaust it out the outer edge.

Hope this helps ...

Cliff

 

They are on rite.the vanes inside the rotor are NOT directional.The air need to spin off the rotr and away from the hub.I have done testing and found that if the air goes twords the rotor the hub temp goes up atleast 50 degree[infared]and when I run hub temps over 400 degrees 50 degrees can make or BREAK and wheel bearing.stn

 

"Riiiiiiiiiiiiight" !!!!

 

Stan,

So you are not using a directional vaned rotor? Also, when
you engage the inner radius of the slots first, it was my
understanding that you ran the chance of "smearing" brake
pad material.

I'm sure you put a lot of thought behind yours, but Brembo,
Baer and SSB all go the other way ...

So yours are NOT like ....



[QUOTE]Originally posted by Ruslow
The air need to spin off the rotor and away from the hub./QUOTE]

The air INSIDE or the SLOTS outside? If the inside, then
we are in agreement and saying the same thing.

 

Nevermind...Just re-read the thread.

 

if the rotation of that tire is correct then u have it right.

 

They are going the same direction.

 

The rotors are a stock replacement and being that they are not a directional vane.When I mill them they become directional due the the fact of the fire slot NOT the vanes.As for 'smearing' I would say it is possible if you start using surface speeds of the inside of the pads versa the outside.But the idea was to keep the hot gases from the hub and washing over the rotor surface.Instead I made it so they spin off the rotor and away form the surface.Like a LP record would if you put something towards the center then turned it on.Stan

 

*NOD* *NOD* ... I understand now ... I didn't know the stockers
were non-directionally vaned.

Sorry for all the confusion.

 

These are correctly installed Brembos.

my old car

http://www.msu.edu/~nawrock3/caliper.jpg
http://www.msu.edu/~nawrock3/rim1.jpg
http://www.msu.edu/~nawrock3/rim2.jpg

they are on backwards.

 

If all you look at is the direction of the fire slot in the context of other manufactures then yes BUT like has been said already the direction of the rotor is governed by the cooling vanes inbetween the 2 friction surfaces.Like I have said before,they are installed correctly.Stan