R1 Rotor Direction

[ion] C2 · 05-31-2008, 02:44 PM

Those of you who have or know drilled/slotted brakes, specifically the ones from R1Concepts (E-Line Performance Rotors), which way are they installed?

I've read multiple different instructions on forums across the interwebs, it seems to depend not on the slots/holes angles, but the vane vents within the rotor.

Is this correct? Should the internal vanes look like that and basically suck the air from the center and expell it outwards? Or should it be reversed and cut through the air like a saw and vent it all toward the center of the rotor?

How do you guys have them installed? I read on Baer's site that if they are installed incorrectly it will lead to premature failure and whatnot.

alerored04 · 05-31-2008, 02:53 PM

I have no idea which direction mine are on. I have had them for two years or more with no issues. I dont think it matters unless I got lucky and did them right on accident.

cherrington17 · 05-31-2008, 02:55 PM

to me, i'd think its your first guess. for heat dispersal, you'd probably want it to vent air outward...

[ion] C2 · 05-31-2008, 02:56 PM

That's what I'm thinking the more I read about it, that the slot direction does not matter, it's the internale vanes that should be directed always the way the above image shows it.

I'm having some shop do it whenever they come in (Monday I think) so I want to make sure I tell them to install it the right way (if they don't already know).

Vinalero · 05-31-2008, 03:06 PM

I think mines are installed the opposite way from your diagram and I had no problem for a year. I'm wondering if I should have installed them the other way though.

[ion] C2 · 05-31-2008, 03:09 PM

My old CAD teacher said the vanes are supposed to be the opposite way of the drawing, but most brake companies' sites say otherwise.

Quote:

Originally Posted by Brembo

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.

Looks like I'll just have to take a look when they get here to see if the vanes are curved.

Vinalero · 05-31-2008, 03:14 PM

Well I would think they are suppose to be the opposite because logically, heat has to get from the center of the rotor to the edge of it, but thats just what I thought when we installed them.

I guess its something like the arguing about installing STB with the car jacked or not.

[ion] C2 · 05-31-2008, 03:16 PM

^Nope this one's actually a requirement for proper cooling. Looks like the original drawing above is correct, according to Brembo. It's done as a centrifugal pump.

cherrington17 · 05-31-2008, 03:21 PM

woot, i was right!

AJules · 05-31-2008, 03:54 PM

I actually had mine installed backwards for a little bit

I had them switched around, but didn't really notice any difference though...

The proper way does seem to make more sense though

Redog · 05-31-2008, 04:58 PM

OMG, you are not asking this question

You are losing a lot of ground lately.

The photo posted it correct

[ion] C2 · 05-31-2008, 05:02 PM

^What? I'm losing "ground"? I've read all across forums and brake sites conflicting positions, so I figured I'd ask those who actually have them installed... I know now that the original image was correct.

I've been told both ways by different people and websites, so then I took a look at Brembo's site (who I'd assume I can trust) and that confirms the above drawing is the correct rotation direction. What's so bad about not knowing the direction your rotors should spin? I've designed brake rotors and calipers for my mechanical engineering classes, I know fully how the brake system functions, just didn't know which rotation direction was the correct and more efficient cooling method.

Redog · 05-31-2008, 05:04 PM

Aren't the rotors marked with a L and R?

I know you have had slotted rotors before

[ion] C2 · 05-31-2008, 05:06 PM

I've never had slotted rotors before. Maybe they are. I don't get them in until Monday.

I'm rolling on the shitty OEM ones, which are warped so much that they tap the pads without braking. Shakes terribly when braking.

zoL · 05-31-2008, 05:44 PM

Lol. I just threw mine on, and didn't check if they were marked. Eh, w/e they work fine.

NickAlero2000 · 05-31-2008, 05:47 PM

here...
front left wheel.
the slots shoot backwards towards the rear of the car.
they do the same thing on all sides.
its a pretty simple install, not really a PITA project.
congrats on the upgrade!

[ion] C2 · 05-31-2008, 05:55 PM

that's what i figured they'd look like. as long as the internal vent vanes are curved toward the rear just like the holes/slots (which they should for the sake of having holes where the vent material isn't) then it's correct

Redog · 05-31-2008, 08:59 PM

You'll like the braking.

I had powerslots and they were OK compared to the Summit house brand. OMG the first time I hit the brakes, I had to put my eyes back in my head

40 to 0 in less than 2 seconds

Ryan from Ohio · 06-01-2008, 10:19 AM

I just did rotors on my buick... And to tell you the truth the casted in ribs in the center between the brake surfaces appeared to be centered.

[ion] C2 · 06-01-2008, 10:22 AM

yeah some are nondirectional vanes, but I'm quite sure R1Concepts are directional curved vanes, i'll see tomorrow