I have been doing a little research on the direction that slotted rotors should be installed. Unfortunately I have found nothing but conflicting information. StopTech states that the groves should be pointing to the back of the car, while Brembo states that the slots should be pointing towards the front of the car.

So, the question is. What direction do you guys have yours on? Does anyone know for SURE the correct way these should be installed? Or, does it even make a difference?

 

Ahhhh I remember posting this in the JBO. The answer is, it all depends on the manufacturer. Certain rotors have the grooves extend all the way to the edge of the rotor these are done to allow the spinning of the rotor to throw the gases and heat out as they spin, so your going to install these so they slap the ground or point rearward when viewed from the top of the wheel. Now those that are vented all the way through relie on the air being forced through small vents in the rotor and they are designed as small scoops so the drilled holes are set up in the exact oposit direction of the simple grooved ones. They then usualy have grooves put on the face of the rotor as well but if you look closly you'll notice they do not extend to the rotors edge because they don't vent anything, they re only for radient cooling.

Does this help?

 

It sort of does but it doesn't really answer the guestion. The rotors I have are not vented all the way to the outer edge. I'm to the point where I am ready to install these but the only thing stopping me is that I am unsure what direction should put them on.

 

If they're not vented to the edge do they have holes drilled in them?

 

Isn't there install instructions with the rotors in terms of the directionality that the rotors should go?

 

Some times no, I think thats why he's confused.

If they have no holes drilled in them then the slots on your are more for looks and you can run them either way.

 

post pics of them it will help us out more in deciding which way they go.

 

mine go towards the front of the car

 

I have GMPP ones, and they go the opposite way from that pic. They were marked right and left, so I know I have them on the way the manufacturer intended.

 

Another thing is to consider is that slots are there to clean any crap off the pads, kinda like a scraper, so you always get max contact.

I would want the top of the slots pointing toward the rear of the car if you are looking at the top of the rotor.

Lets say a tiny rock chip gets on a pad. If the slot tilted forward and you were driving forward, that rock would be forced down the rotor, down the slot toward the hub.
If the slots were facing the rear, it seems to me that the rock chip would be pushed up the slot and centrifical force would help it fly off.

Just my opinion, but it makes sense to me.

eazyasone23, are all 4 of yours facing forward? Some companies only machine them in one direction, I guess they figure it doesn't matter.

Randy
'05 Yellow SS/SC

 

yea mine are all forward thats wat the directions said to do. hmm dunno either way they work pretty well

 

I Noticed that there were conflicting directons on every set of slotted rotors.


In the end. It doesnt matter.

 

if i believe correctly the slots on the rotors the open ends are facing the front of the car. like there angled towards the front of the car. same as the drilled holes.

ryan.

 

I put them on facing forward. They don't indicate one dierection of another and Uneek told me it didn't matter so who cares, haha.

 

when they are pointing forward (ie brembo, which is what i have and how i have them installed) the point is to increase stopping power. i believe when towards the rear it is more intended for reducing temps. thats the way i understand it at least

 

After doing a little more research, I found that the inner cooling fins are what determine the correct rotation direction and not the slots. The inner cooling fins should rotate pointing forward so that air can pass through the inside of the rotor more effectiently. In my case, the inner casting of the rotor does not have any directional fins so the rotation direction does not make a difference. I guess that is why I was getting conflicting information from different manufactures. Some design their rotors with the fins and slots going in different directions, therefore requiring different mounting procedures.

Hope that helps some people in the future.

 

Right, thats why some rotors will have a side to them, you will get a right and a left if you order a pair of fronts. That is due to the inner fin design for cooling. Cheaper rotors just use the same design on both sides, so it doesn't matter. Most OE rotors are directional, but most aftermarket basic rotors that I have seen tend to be universal. I'm talking about regular rotors also, not drilled/slotted or whatever. Its just a matter of simplicity and cost for most aftermarket compaines, so they produce all the rotors the same. My GMPP ones actually came from two different places, one side had "Made in USA" stamped on the box, the other said "Made in Canada".

 

BooSSted, Itialian Joe, + rep to both of you for the back up. And for actualy posting when you can correctly answer the question rather then just talking out your butt.

 

Same to you sir! Thanks for your input!