A Stupid ? But

[DarthMarauder]

How do you guys with slotted and cross drilled rotor mount them??? Does it matter which way the vanes go I'm figuring using common sense that they go on where the gases would be going out but I was just wondering if it really matters which way they should go.

[RoyLPita]

The last set that I installed specified whether it was a left or right side rotor.

[martyo]

Yes, they are directional.

Which brand do you have?

[RF Overlord]

Darth:

Todd "The Big Brake Dude" from TCE told me it actually doesn't matter which way the slots go, what matters is if the rotors are vented you need to be sure the internal vanes (which are curved) go the right way, so centrifugal force can expell the heated air properly. Rotors are normally marked L and R if it matters, otherwise they can go on either side.

[DarthMarauder]

They are ebay rotors I got. Thanks RF I didnt even look to see if they were marked L and R. I was just curious if they were a directional type item and I see that they are.