Quote:
Originally Posted by DataStream18
There is no backwards or forwards with drilled or slotted rotors.
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I would agree that the direction of the slots and cross-drilled holes makes little or no difference... the vanes INSIDE the however can be designed to have a specific direction to them:
Straight vain, as above, rotational direction matters little, just as you said... on the other hand...
... curved internal vanes "scoop" cool air as they rotate and direct the air towards the hub. I don't know how much cooling they provide under normal driving conditions (hence my question), but they are designed with a specific rotational direction.
As far as changing them myself, I was sooooo tempted today as I had the car on a lift, while attending to some curb damage... but the dealer has offered to pay for it and I'm anticipating the usual BMW "How can we make it right?" question... and I still need some new rear pads, soooooo... (fingers crossed).