Sorry for the late post. Did a search on vane direction, because it appears I put all my rotors on backwards. At least by everyone's standards I read. Someone asked for temp measurements R and L. This is for stock brakes: After a VIR run I got 100-150*F more on LF than RF (C6 Z06). The vanes orient back at the top on the LF and forward on the RF. So, I got better cooling with vanes running forward. The story gets worse.....

I did this search because I was sure my Brembo directions said to orient top vanes forward. I had another car with them installed the same way by the dealer who read their directions. The boxes were also labeled as to where to put them.

According to everyone, mount them with the top vanes rearward. But I had to relate my temperature results, which seem theoretically opposite. I postulate the vanes facing forward scoop more air because of the larger perimetry, air exposure, and radius. It conducts heat through the entire rotor to be radiated more effectively, larger surface area. Just an idea. Pads and discs on my old Brembo'd car wear evenly and not fast. I have little brake dust, no fade, at HPDEs and I'm one of the fastest cars there. I have no explanation for my results, just one of those accidental things.

I welcome any feedback as it remains a mystery to me, and brake safety is very important to me.

 

Off the top of my head, I'm going to guess the air is primarily moved over the rotors by centrifugal forces (before any nerds calls bs, I'm talking about the rotor's reference frame :p), i.e. as it gets accelerated tangentially, it is 'slung' from the inside to the outside of the rotor. As this occurs, the air will also see coriolis 'forces' and will bend toward the back of the rotors because the tangential speed of the outside of the rotor is greater than that of the inside of the rotor. I'm going to guess that forward facing vanes will slow the movement of the air, as their faces will be approaching facing perpendicular to the direction the air 'wants' to travel, thus the force they impart on the air mostly slows it. In my head, the rearward facing vanes are pretty close to a stationary point where it moves the air the fastest.

 

Wheel bearings have a hard life at the track. Forcing rotor hot air at them is not going to be good.

Randy

 

 

Thanks Ya'll, I helped me out! Good thread

 

Hi:
Spoke to Tom Wallace the chief engineer for the Corvette , at the C5 C6 Birthday Bash at the Corvette Museum last weekend , and he says that the direction of the rotor vanes for the C6 does not matter. The vane direction does not matter on the street. He said any temp difference at the tracks can be attributed to the ASR applying the brakes to stabilize the car. Different direction around the track would have more effect on temps. GM would have put two different rotors on if the temps were that much different.
Has anyone done some straight line stops from a high speed and checked temps?
Tom also swore there was no Blue Racer , Corvette SS or supercharged Corvette !
I just saw the June 2007 Motor Trend mag and they say there will be a supercharghed 7.0 litre 700 HP Vette called the Z07 in 2009.
They also say the C7 will launch in 2010 with the 7.0 litre 505 HP LS 7 motor standard.
I hope all of this comes true !
Ed

 

The things he tells you should make you know he is lying. Vanes do make a difference on the track but not at 70 MPH.

 

Yes

 

Google. Copy. Paste on CF.

 

Uh, no. Guess you don't know me very well.

But thanks for playing