I agree that slot direction does not matter. It's just a degassing feature from what I understand. But what is important is which way do the vanes move air. Typically there is some kind of brake ducting whether it be tubes or scoops which funnel air from the inside to the outside of the hub/disc/wheel over the inner bearing area. Vanes inside the rotor then help to facilitate this movement of air not work against it so they always need to point "up" to pull air through. Slots don't matter then. But they do look racey and cool and that is important. That's how I remember it anyway....
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Steve Potomac PCA Co-CI(retired)
89 944 Turbo Race car
85.5 944 NA son's 2015/2019/2020 944Cup and PCA Nat'l Champ racecar
94 968 1 of 11 Iris blue coupes
92 968 1 of 2 Tahoe Blue Cabriolets
98 993 C2S w/Aerokit II
77 911S Vintage race car project
70 Boss 302
86 Mustang SVO
24 F250 SD Godzilla
"Noel spun! Noel spun! Don't do anything stupid, Dad." -the boy on the radio on the last lap of NASA race as the second place car spins behind me in T5 at Summit Point.
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