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Join Date: Sep 2007
Location: Norway
Posts: 358
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Cutting holes in the front air-dam for brake cooling
Has anybody cut brake-ducting holes in the air-dam?
Cutting the holes is a easy, but how to make it look good? Like for example a RSR front bumper... It would be much more effective than having a scoop mounted to the A-arm and getting air from under the car! I have tried to find a solution to this, but failed...  I remember seeing a Club Sport Carrera (early eighties car) having such brake-ducting... Maybe that was an original fix! Other cars had the fog-lights mounted here. Ole 
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12-09-2007, 09:09 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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I like this one I saw on the forums although it is a stock valence:
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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12-09-2007, 09:16 AM
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Join Date: Mar 2004
Location: Higgs Field
Posts: 22,614
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I used a simple hole saw. It is, however, very difficult to get a hole saw to cut true on an uneven surface like a front air dam or spoiler. It will grab on the first side that makes contact and try to walk accross the surface, making one hell of an ugly mess. The trick is to guide it somehow.
I have a hole saw mandrel in which I can replace the pilot drill bit, so it was easy to install any length I needed. I put a foot long 1/4" drill in the mandrel as a pilot. After drilling a 1/4" pilot hole in the desired location on the spoiler, I set up a drill block with a 1/4" drill bushing in it. This was clamped to a 2x6 which was clamped to the front a-arm. Everything was aligned and shimmed until the drill bit was level and parallel to the centerline of the car, and I could run that long 1/4" bit through my pilot hole in the spoiler and into the drill bushing without binding. I used several c-clamps to hold it all in place. The idea is to have the long pilot drill bit supported at both the hole in the spoiler and at the a-arm, bridging the two. That way, when the hole saw makes contact on just one side of the future hole, it cannot grab and skitter accross that surface. Go very slowly, with lots of rpm's and very little pressure. I managed to get perfectly round holes in the "V" of the spoiler on my 'glass S bumper that way. Gratuitous pic (please excuse the mud; I had just spent the day chasing a couple buddies on some Oregon logging roads, doing our best Walter Rohrl immitations). The brake cooling holes are a little hard to see, but its the best shot I have after I made this mod: 
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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12-09-2007, 10:34 AM
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Registered
Join Date: Oct 2002
Location: Minneapolis
Posts: 775
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Brack cooling ducts in a S bumper
Made this solution to the same problem with custom formed ducts. Interested in a set?
Bob Parts and the cut out sections that are removed from the fiberglass.  Mock-up of how they look when glued to the rear side of the bumper. 
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12-09-2007, 01:48 PM
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Quote:
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Shane - 1984 928S |
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12-09-2007, 01:53 PM
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Join Date: Oct 2002
Location: Minneapolis
Posts: 775
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V8, Sorry, nope. Just the mock up so far.
Also have the 3x 6" wide rear opening for the oil coolers. |
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12-09-2007, 02:33 PM
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Join Date: Dec 2005
Location: Rancho Cucamonga Ca
Posts: 361
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Here's mine, the PO made the cuts to allow airflow to the oil cooler.
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'75 911S Silver Anniversary #164(Formerly JTO's) Rebuilt 2.7 with full ARP, 9:1 CR. SSI, GHL, ER polybronze bushings, finned oil lines. Lowered and corner balanced. CIS retired, now PMOs! '65 912 slate gray sunroof (driving project) |
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12-09-2007, 03:48 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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I really like that. Without fogs that looks great.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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12-09-2007, 03:58 PM
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Registered
Join Date: Feb 2002
Location: Asheville, NC
Posts: 1,415
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Quote:
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Gone but not forgotten - 1980 Porsche 911SC w/ -22mm/28mm Torsion Bars | Custom Valved Bilsteins | 22mm/21mm Carrera Sway Bars | Elephant Poly/Bronze Bushings | Carrera Brakes | AJ-USA Brake Cooling | Carrera Oil Cooler w/ Fan | Elephant Strut Brace | Oh, and no ABS or PSM or A/C |
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12-09-2007, 04:41 PM
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Join Date: Sep 2007
Location: Norway
Posts: 358
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This was great!
Hi, this was great! Several good ideas.
I was thinking of cutting holes like on the 930 or the silver car! And it looks just great.  I will try and do the same on my 1974/75 911S... And I am going to add some 964 RS style air-"collectors" on the front brake shields. Or is the RSR-style air-cooling sets a better idea? Then the air is pressurised into the brake rotors, but on a street-car this may bee to much? The car only sees sporadic track-action... And then, just for fun and to improve my driving skills, which is of course is never a bad thing. I think I will try the 964 RS-style shields. Then I can just pop bigger "air collectors" to the exisitng brake shields. Ole 
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12-10-2007, 02:10 AM
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(the shotguns)
Join Date: Feb 2006
Location: Maryland
Posts: 21,628
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Higgy that rocks!!! Maybe take a video camera next time so we can all enjoy the ride!
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***************************************** Well i had #6 adjusted perfectly but then just before i tightened it a butterfly in Zimbabwe farted and now i have to start all over again! I believe we all make mistakes but I will not validate your poor choices and/or perversions and subsidize the results your actions. |
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12-10-2007, 04:06 AM
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I cut holes in my RS bumper with a sabersaw, and fabricated the cooling ducts out of a couple of 2.5" galvinized roof jacks from Home Depot and a pair of tin snips. Rivited them to the bumper with some screen in between and ran corrugated tubing back to the caliper plenums. Works good, and it was cheap, except for the Smart Racing cooling kit.
   TT ps-battery boxes were removed from my '73 to make routing the hoses easier and get better flow to the fender-mounted oil cooler.
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Tom Tweed Early S Registry #257 R Gruppe #232 Rennlist Founding Member #990416-1164 Driving Porsches since 1964 Last edited by ttweed; 12-11-2007 at 05:49 AM.. |
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12-11-2007, 05:47 AM
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911
Ultima GTR
LeGrand DSR
GT3
