Wheel fans, fyi Options

[TimT]

I took some pics of my wheel fans, how they mount etc.

Ill post them here instead of hijacking that 917 thread (IMG:style_emoticons/default/rolleyes.gif)

This is the threaded insert that mounts in the wheel center.

[ArtechnikA]

Those studs look a little on the short side ...

now you know why he covers them up with a fan !

i think the straight fan blades work just fine - Porsche and BBS have access to wind tunnels for testing... i wouldn't count on them being super-effective all by themselves - but recall that they're used on cars that already have been equipped with substantial ducts to the eye of the rotor - that aren't quite enough. so there's a nice supply of inlet air - you just have to encourage it out, and i believe the centripetal forces would work just fine.

even at race car speeds, they don't turn much faster than 3000 rpm - they don't have the issues turbocharger pinwheels do.

as a side benefit (pardon the pun) straight vanes don't care which way they turn, and you can mount them on either side of the car - fewer spares, one less thing to get wrong in the pits ...