? FAN assistance for front brakes - any BTDT ?

Craig 930 RS · 04-30-2006, 03:53 PM

I need additional cooling for the front (big red, actually black) front brakes. THe AJ-USA kit hardly has any air heading into the scoop as the car and front valence is very low.

So - has anyone performed fan assistance brake cooling on a 911?

Front ports are occupied with cooling for the 1 center + 2 side oil radiators -

Porschekid962 · Porschekid962's Garage

Do you have ducts running from the two smaller front vents into the fenders or are they simply holes in the bumper? If so why not use a duct that feeds your 3inch hose. If you want to go with an electric fan check out what hrp has to offer. You can get ducting and fans from them and the prices are more than reasonable.

http://hrpworld.com/index.cfm?form_prod_id=167,49,363_73&action=product

If you want to see what they have I go into the racing section then into the brake system heading, at the bottom of the next page is "Temperature control-brake system" and you can find different duct shapes and the electric fans which hook right up to 3 inch or 4 inch hose. Looks like a fun weekend project. The 3inch fan moves 135cfm and the 4inch moves 235cfm.

Craig 930 RS · 04-30-2006, 06:30 PM

I don't - per above it is for the 2 side oil coolers.
THanks a ton for the info and site - what a great idea. $20 per fan & housing is also a great price.

Currently I have 2-4 inch SPAL fans - which would be quite a bit of work to rig up for this application.

Thanks!

klaucke · 04-30-2006, 06:47 PM

Craig, judging by the ventilated portion of the rotor (not the holes), it looks like your front rotor is on backwards!? If that is the case it could definately be responsible for some of the brake issues. Perhaps you can post a better pic of the rotor orientation.

smdubovsky · 05-01-2006, 09:29 AM

Looking at the vanes in the 2nd pic - I too think you've put the rotors on the wrong sides of the car. The vanes on the top of the rotor arc towards the back fo the car ('throws' air out w/ rotation insead of scooping it in)

SMD

Craig 930 RS · 05-01-2006, 09:32 AM

Is that not exactly what I want?

IE air is fed to the center of the rotor via the scoops, and out through the vanes -

ErVikingo · 05-01-2006, 09:46 AM

BTW, I've seen those same fans at West Marine...

Why not try one of Sherwood's H20 misting systems? Check out his website.

I use the same spoiler and scoops you have and do not have overheating problems. What pads are you using?

Craig 930 RS · 05-01-2006, 09:49 AM

Usint the above picture, take a look at how much air I am NOT getting to the brake ducting - the scoops are virtually worthless. The Pagid Yellows on the Big Reds are great, but the fresh ATE Blue goes south after about 20 minutes, then come right back....unnerving.

ErVikingo · 05-01-2006, 09:54 AM

Why dont you try then splitting your openings to share the oil cooler duties with the brakes? You could use the smaller ones (signal openings on frt bumper) for the brakes and would perhaps consider the mist system I mentioned.

I use a radiator type cooler on the fender (no fan nor vents) and a center mounted front cooler which works great on my NA application. With your turbo, I'm sure you could use a ton more of cooling though...

ChrisBennet · ChrisBennet's Garage

Judging by the holes and the involute vanes, the rotor is correctly mounted.
Air comes in the center of the rotor and gets flung out like spices on mom's Lazy Susan when you spin it too fast.
-Chris

Craig 930 RS · 05-01-2006, 10:15 AM

Yeah, I hear ya -

The turn signal openings direct air to both fender coolers, as do the two rectangular openings in the bumper (which are normally used for brake cooling).

I could route cooling to the brakes from the signal openings, but I kinda hate to give up the additional cooling to the two coolers.

But I do have 3 oill coolers and never a temperature problem.....

Steveinatlanta · 05-01-2006, 10:18 AM

OK. I'll step up. If Craigs rotors are on backwards, mine are too. While I remember a thread addressing this in the past, there was never an outcome. Sorry, don't mean to start anything, just very curious at this point

smdubovsky · 05-01-2006, 11:30 AM

They are definately on backwards.

http://www.stoptech.com/tech_info/faqs.shtml#16

The holes and vanes often go different directions (but not always). You actually have to look at the vanes.

The porsche 82-83 turbo tech spec manual has this pic:

If you look at the porsche part #s it puts them on the correct sides (they are usually marked L or R in a circle to help)

SMD

Bill Verburg · Bill Verburg's Garage

This rotor is definitely backwards

Once you get that straitened out, if you don't want to give up oil cooling, run a couple of 4" ducts through the trunk, and out perpendicular to the side, pick up the air from above the center oil cooler.

As w/ the center cooler if you have a straight shot of clean air from the front center to the rotor w/ a minimum of kinks, all will be good.

Emission · Emission's Garage

The rotors spinning in the correct direction should help, especially since in this direction they are fighting with the scooped air!

Wil Ferch · 12:58 PM

I think the 3" or 4" through the trunk and then out thru the wheel wells....

...is impeded if you run a stock gas tank.... a fuel cell offers a smidge of internal space on the trunk-side, before it makes a turn through the inner wheel wells.

See here-->

Feedback on brake cooling idea.

Wil

Craig 930 RS · 05-01-2006, 01:00 PM

Went out to check both sides:

Both are on backwards. The holes seem to 'flow & fan out' correctly, so I can see how/why the PO put them on backwards. Aagh.

widebody911 · widebody911's Garage

Hmm. I guess mine are on backwards, too...

Bill Verburg · Bill Verburg's Garage

Quote:

Hmm. I guess mine are on backwards, too...

oem Porsche and Brembo rotors, have holes that do follow the vent involutes, that is not the case w/ aftermarkets, always look at the vent patterns, natural flow flow is from axle to edge and inside to outside.