R1 Rotor Direction

[[ion] C2]

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.

http://www.racingbrake.com/v/vspfiles/images/disc_rotation.jpg

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]

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]

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

[[ion] C2]

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]

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]

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

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]

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]

^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]

woot, i was right! :lol:

[AJules]

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]

OMG, you are not asking this question :eek:

You are losing a lot of ground lately.

The photo posted it correct

:No: :No: :No: :No: :No: :No: :No: :No: :No: :No: :No: :No:

[[ion] C2]

^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]

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

I know you have had slotted rotors before

[[ion] C2]

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]

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

[NickAlero2000]

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]

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]

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 :lol:

40 to 0 in less than 2 seconds :eek:

[Ryan from Ohio]

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]

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

[01silveralero]

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

I know you have had slotted rotors before

mine weren't marked l and r

[Ryan from Ohio]

Many of these rotors I see on E Bay look just like stock ones that have been machined.

[[ion] C2]

That would be pretty retarded. Good thing R1Concepts is a quality brand and I bought from the real R1Concepts seller.

[Cliff8928]

Ya, That pic is right. My Baer rotors were marked the same way.


http://www.aleromod.com/forums/image.php?u=2087&dateline=1152686748&type=profile

[Rexter9x]

Hey cliff, those are some nice looking rims, what are they?

[AJules]

Ya, That pic is right. My Baer rotors were marked the same way.


http://www.aleromod.com/forums/image.php?u=2087&dateline=1152686748&type=profile

uhmm... Isn't that the opposite way of the diagram?

now I'm a little confused

[Cliff8928]

Hey cliff, those are some nice looking rims, what are they?

Read the sig pic...

uhmm... Isn't that the opposite way of the diagram?

now I'm a little confused

No, The view in the pic is of the INSIDE of the rotor, not the outside that you see through the wheel. (pay attention to the direction of rotation)

C2;360575']
http://www.racingbrake.com/v/vspfiles/images/disc_rotation.jpg

[cliffordwoeller]

Hey cliff what did you do to your caliphers ? Did you powdercoat them or get some after market ones ?

[Cliff8928]

Both, they are aftermarket, and powder coated.

[cliffordwoeller]

is it the gm brake upgrade kit you talk about ?

[TheMeaningOfLife]

Its the corvette brake caliper swap, do a search for it or go over to grandamgt.com and look under the how-to section

[Cliff8928]

is it the gm brake upgrade kit you talk about ?

Yes, 12" F/W body rotors, '98+ F-Body brackets and F-Body or the better Corvette or GTO calipers. I don't like calling it the "corvette" brake swap, because that's not really what it is. Everyone just likes to call it that.

[Oldsman]

40 to 0 in less than 2 seconds :eek:

Why so slow....................LOL

[cliffordwoeller]

hmmm ok so those brakes work really well ? stop you pretty good ? I have power stop ceramic pads and drilled and slotted rotors but to me its like my pedal has to go half way if i want to stop really quick where as with stock it was i just start applying pressure on the pedal and could feel the brakes stoping me but again the ceramic pads and rotors seem to be a lil lacking and i dunno if its just cause i have the wrong set up or what

[[ion] C2]

I got them in today, and they aren't directional vanes, just straight ones.

So which way looks better? Cliff's or NickAlero2000's. I'd think the way NickAlero2000's is set up would push the gases outward due to the orientation of the slots, rather then the "sawblade" direction of Cliff's.

[cliffordwoeller]

Hmmm i seen the R and L on mine so I hope I installed them correctly

[Alero_1986]

So what was the conclusion in this post? Which way should the R1 rotors face? like cliff, or like NickAlero2000?

[cherrington17]

depends on the kit.

really good ones come prelabelled.

[Alero_1986]

The R1 Concepts E-Line did not. The part number on the box is the same for both fronts, and the same for both rears. The only number I was able to find on the rotors aside from the p/n was the min thickness, and some other faint writing. nothing resembles a L or R

[CactusWill]

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


I 2nd that motion. Direct them outwards in proportion to forward movement.

[Spilner521]

Non-directional vane brake rotors are like non-directional tires. You can mount them however you want and whichever way you think looks good and either way won't negatively affect performance.

[CactusWill]

The diagrams posted in this thread appear to reference directional rotors.

[[ion] C2]

Yes, they do. With directional rotors you want the air vented outwards so as to act as a centrifugal pump. Since the R1Concepts rotors' internal vanes are not curved, you CAN mount them any which way you want, but logically, you'd want to mount them such that the external slots are forcing the gases/water outward to the edge of the rotor rather than toward the center of the hub.