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Registered
Join Date: Oct 2005
Location: Northern California
Posts: 3,756
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Regarding "lips," no they are not necessary. Again, the goal is to seal the back side of the rotor.
I have not studied the physics, but I thing all of the major cooling comes through the vanes.
One old school approach I have seen has thin alu with an OD slightly larger than the rotor backside opening ID. In this case it was maybe 40 or 60 thou. The metal contacted the rotor surface ever so slightly. No issues.
That was on an IMSA championship car.
Some (perhaps all?) 962s not only cool the rotors with ducting, but also the front wheel bearings. Ask me how I know...
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Mike
PCA Golden Gate Region
Porsche Racing Club #4
BMWCCA
NASA
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