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Posted by: TimT Jan 20 2004, 07:59 PM

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

Ill post them here instead of hijacking that 917 thread

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


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Posted by: TimT Jan 20 2004, 08:00 PM

This is the wheel fan from the back, with the center bolt


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Posted by: TimT Jan 20 2004, 08:01 PM

plastic center bolt


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Posted by: TimT Jan 20 2004, 08:01 PM

back of the fan


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Posted by: TimT Jan 20 2004, 08:03 PM

They used to be on a gold car

Posted by: ! Jan 20 2004, 09:01 PM

Used to be? Meaning you are going to sell them?

Posted by: ChrisReale Jan 20 2004, 09:08 PM

Are these still made? Or do you need to bottom feed at the junk yard racers supply?

Posted by: Mueller Jan 20 2004, 09:24 PM

Tim,

Those studs look a little on the short side

Thanks for the pictures, I never knew how those mounted.....

Posted by: McMark Jan 20 2004, 11:38 PM

That "fan" setup doesn't exactly look like it moves much air.

Posted by: Air_Cooled_Nut Jan 21 2004, 12:53 AM

Yeah. Straight blades

Posted by: Britain Smith Jan 21 2004, 01:04 AM

I would have to say that I think that the straight blades on these fans would be designed to create turbulence and not have to move large amount of air. Heat is discipated faster under turbulent conditions than it is under laminar flow.

Just my $0.02...

-Britain

Posted by: ChrisReale Jan 21 2004, 01:38 AM

I think Britain is right. Its not like an impeller fan.

Posted by: ArtechnikA Jan 21 2004, 07:18 AM

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 ...

Posted by: McMark Jan 21 2004, 02:24 PM

Plus, they cool in reverse as well.

Posted by: Scott Schroeder Jan 21 2004, 03:59 PM

Soooooooo...... how would "someone" go about getting two of these with hardware for a 15" wheel?

Any info is appreciated I, errr, I mean my "friend" would love a set of these for "his" front wheels....

Posted by: rick 918-S Jan 21 2004, 05:01 PM

What the heck are those? Really....

Posted by: TimT Jan 21 2004, 05:53 PM

I knew you guys would pick on my nuts

Im not sure what lug nuts they are, but I get 18mm grip,which is plenty, flush would look better though.

Actually that type fan isnt that http://www.engineeringtoolbox.com/37_142.html. Looks a lil bit like the fans on the -4 engines?


I think these fell out of favor as brake technology became better.

I havent seen these for 15in wheels, you could make them or check out swap meets.

The 914 gets enough attention at track events here, having these on it makes it even more different

Posted by: Scott Schroeder Jan 22 2004, 02:47 PM

here are two cars with them


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Posted by: Scott Schroeder Jan 22 2004, 02:48 PM

...


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Posted by: TimT Jan 22 2004, 03:33 PM

935's give me wood