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All metal air box
My '74 Targa has an all metal (aluminum I think) air box made by Webbs Machine Design in Clearwater, Fla. It was on the engine when I bought the car and from my research the 2.7 seems to be the original. Is this a good thing and what about the spring adjustment on the airflow plate (where a pop valve would be installed) at the bottom of the box. Any info would be graet.
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1974 911 Targa "SPEED LIMIT 70 MPH" + 75 CLARK B. |
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06-09-2006, 02:13 PM
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Pictures!!!!!!!!!!!!!!!!!
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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06-09-2006, 02:47 PM
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These are very nice airboxes with a good "flapper' design.
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2002 Boxster S . Arctic silver + black top/int. Jake Raby 3.6 SS engine " the beast ". GT3 front bumper, GT3 side skirts and GT3 TEK rear diffuser. 1999 996 C4 coupe black/grey with FSI 3.8 engine . Rear diffuser , front spoiler lip with ducktail spoiler . |
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06-09-2006, 03:16 PM
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These work better than the stock boxes, I have been trying to get a hold of one for a 79 Sc, Webb sold the tooling and dies to another shop and I am waiting to here if they are willing to make me up a new one for my new SC turbo engine. They sold thier pop valves with different spring pressures to allow the use of a turbo. I am interested in purchasing a used one if anyone has one for sale...
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 914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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06-09-2006, 06:45 PM
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SS air box
aa
 
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914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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06-09-2006, 06:48 PM
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That looks real nice! Cool pop-off feature too.
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83 911SC Targa Everything I say is my personal opinion, and has nothing to do with my team. |
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06-09-2006, 07:36 PM
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Location: Worcester, MA
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Stainless steel? Isn't that a LOT heavier than the stock plastic box? Wouldn't aluminum have been a better choice of material?
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Owner of a wrecked 944 |
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06-10-2006, 08:41 AM
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Thanks for the info. The pic is exactly what I have on my 74 targa. I assume that on a stock jetronic system, the pop valve would need to be in the normally closed position opening only if backfire occurs.
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1974 911 Targa "SPEED LIMIT 70 MPH" + 75 CLARK B. |
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06-10-2006, 09:09 AM
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You know the funny thing is my stock 74 2.7 had an aluminum airbox in it with porsche satmapings etc. I can imagine what it would cost to make that box out of stainless. I would 4-5 hours in welding,tacking etc.
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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06-10-2006, 11:41 AM
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I was quoted 600 bucks
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914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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06-10-2006, 12:47 PM
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A few months ago, iamchappy posted a pic of a Webb air box. I have one on a stock 2.7 1974 Targa and I have a question. When I have the air box cover off, start the engine and advance the throttle, the metal spring loaded plate lifts. Is the plate supposed to lift under normal acceleration or lift only if a backfire occurs? Are the springs too weak? Do I have a valve/head gasket problem causing back pressure? Any advice would would be appreciated.----------Thanks
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1974 911 Targa "SPEED LIMIT 70 MPH" + 75 CLARK B. |
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10-26-2006, 03:12 PM
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Clark, I ran across this new one for sale for anyone else that may be interested in the SS air box.
The plate should only lift on a backfire. http://www.rennlist.com/ads/ 911 CIS Steel Air Box Category: 911/993/996 Parts for Sale Ad Number: 9921 Date Posted: 10/22/2006 Price: $495.00 Expires On: 12/21/2006 Description Never blow up an air box again. Fits 1974-1977 2.7's and 1980-1983 3.0's. Designed to replace the plastic air box that is so fragile, and often replaced.Comes with a pressure popoff valve installed.This box is brand new,never been installed on an engine. I believe these boxes are hard to find. Seller Information Contact: Rich Bontempi Redwood City, Ca 94063 USA Telephone: E-mail: HPHPorsche@aol.com Web Site: http://www.HighPerformanceHouce.com
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914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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10-26-2006, 03:54 PM
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Yep, that air box probably werighs at least 2 pounds more than the plastic version and about 1 pound more than the aluminium version, which would be more prone to cracking unless it was thick, then to would be heavier. big woop
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10-26-2006, 04:03 PM
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I've talked to the builder of the boxes, he claims they flowed better and provided better performance. He built the air flapper with heavier springs for turbos and had them set up like the BAE blowoff and had different
springs for different boost pressures.
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914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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10-26-2006, 04:43 PM
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Chap
Did the guy you spoke to still make them? Pat
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Patrick E. Keefe 78 SC |
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10-26-2006, 04:56 PM
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No, Webb sold the dies to another guy who would still make them for the right price. There are a few of them around I know Henry from Supertech has one, and Bontempi claims his is still new.
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914 6 Turbo twinplug 3.12 87 924S Lexus SC400 Lexus LS400 |
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10-26-2006, 05:22 PM
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This is an interesting thread...I have one of these SS boxes. It was on my '74 when I bought it years ago, and the only other one I have seen was also on a '74. I guess there were a lot of folks cracking their boxes early on when the CIS cars began to show up here. If it would help anyone I would be glad to take and post some detailed pics of mine.
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Bob V 1974 911 Carrera coupe Grand-Prix-weiß 1977 930 turbo Carrera coupe Hellgelb 2018 Cayenne turbo Schwarz 2019 911 GT3 RS Schwarz |
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10-26-2006, 06:50 PM
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Had one of these on a 3.0 SC motor that was installed in the the 914 conversion car. Nice box.
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'75 914-6 3.2 (Track Car) '81 SC 3.6 (Beast) '993 Cab (Almost Done Restoring) |
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10-26-2006, 07:14 PM
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Hey tx targa ya not to far away from me man. i go to school at San Jac.
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-Tom '73 911T MFI - in process of being restored '73 911T MFI - bare bones '87 924S - Keep's the Porsche DNA in my system while the 911 is down. aka "Wolf boy" |
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10-26-2006, 09:18 PM
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1980 Porsche 911SC
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1973 Porsche 1973 914s 1973 914 6 GT conversion 2.
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2019 GT3 RS Weissach
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