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CIS Removal broken pipe discovery
While I was removing the CIS to get to the Triangle of Death I discovered the aluminum pipe that runs under and behind the air box was broken at the junction.
Any suggestions on a repair or work around ? I can't get a hose & clamps in there for a splice because of where the break is located. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 04:54 PM
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Registered
Join Date: Jan 2004
Location: Docking Bay 94
Posts: 7,036
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Would a broad muffler clamp hold it together? Or perhaps some very thin sheet metal wrapped around and held with two clamps (hose/fuel line clamps).
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Kurt |
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09-09-2013, 05:09 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,520
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Replacement is best option but I dont think you ll do it in the car. I have an 80 injection system on the table so the part is available and can look to see if its doable in the car.
Bruce |
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09-09-2013, 05:11 PM
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Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,520
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You might be able to do it in the car, there is 4 clamps holding it in. The most difficult would be the clamp by the 7th injector. cold start injector. 1 on the back of each diaphram and one over #5 intake.
Bruce |
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09-09-2013, 05:20 PM
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If the motor is out.....remove and replace or have it welded.
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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09-09-2013, 05:22 PM
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CIS is being removed with engine in car
I have done a partial drop and removed all the manifold runners.
I am removing the CIS and making all the usual repairs. I guess I will be needing a new pipe. Unless………Can i strip down the CIS and run it without the AAR and Decel Valve ? Is there a way to run a stripped down version of the CIS without all the plumbing ? I do not have to pass omissions. I know….. I am going straight to Hell... but hopefully I will be going in an Old Porsche ;-) 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 05:36 PM
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CIS Patient Opened Up and is on Table
Can I get the pipe welded do a partial reassembly of the Air Box components outside the car and then reinstall the rest in the car ?
Obviously flying by the seat of my pants here. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 05:46 PM
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Get a new pipe,
weld it or cheaper but will work JB weld. |
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09-09-2013, 05:48 PM
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Quote:
Maybe graft in a piece of aluminum tubing…like a shunt or stent. This could work. It is not like I a moving fuel here, it is just air. I believe the part is number 46. I looked around for this part for my 1980sc with no luck. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 06:12 PM
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Ouch…CIS Air pipe $$$
$550 !!!
Part number 911 110 277 01 I guess I can just make it out of copper tubing. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 06:23 PM
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Registered User
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Area of break
THIS IS NOT MY ENGINE BUT YOU CAN SEE WHERE THE BREAK IS.
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 06:49 PM
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Registered User
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Aluminum air pipe
PART NUMBER: 911-110-277-01
Anyone have one ? 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-09-2013, 09:00 PM
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Slippery Slope Expert
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I might have one (maybe even two!) of those but I'll have to check tonight and let you know. Are '78 - 79 and '80 up the same? I may have one of each!
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09-10-2013, 03:44 AM
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I cant believe the car ran with a huge vacuum leak like that?
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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09-10-2013, 03:51 AM
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Registered
Join Date: May 2005
Location: Eastern Pa.
Posts: 679
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also curious about what caused it to break? bad motor mounts? Other?
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HB Kramer (4 sneaks and 6 airheads): 79 911SC Coupe (sunroof delete) (2 sneaks and 2 airheads): BMWS: R12GS(a) R90S, and some old British iron as well. |
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09-10-2013, 04:23 AM
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Registered User
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Aluminum Air Pipe to AAR, AAV, DeCel Valves
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It did not start well but it did run fine once warmed up. I have read where holes or cracks have been created in this pipe due to vibration. I did notice looking through my old photos that the rubber support by the number six runner was not connected. Perhaps this was the cause of the break. 
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-10-2013, 04:26 AM
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Cause of Pipe break
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to the rubber mount in front of number six runner. Either that or it came loose some how over the years from vibration.
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-10-2013, 04:33 AM
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Aluminum Air Pipe
Quote:
I will do some more research.
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-10-2013, 05:01 AM
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Slippery Slope Expert
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I went and looked at the pipe on the '82 system I have. It is totally screwed up and not usable. (Well, maybe you could in a "cut and weld" sort of fashion) The P/O's mechanic (or someone) pinched the pipe in two places, obviously to shut off it's function from the decel valve and AAR. I'm pretty sure this was done on purpose, I doubt it could have happened in shipping. (I suppose I should give them the benefit of the doubt, but . . .)
So it's essentially history. That's the "loose" system I have stored here at work. When I'll get home this afternoon I will check the one on the pre-'80 system that's currently installed on my engine and let you know. I'm not going to reinstall the CIS, so everything I have is essentially surplus. |
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09-10-2013, 05:19 AM
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So it's essentially history. That's the "loose" system I have stored here at work. When I'll get home this afternoon I will check the one on the pre-'80 system that's currently installed on my engine and let you know. I'm not going to reinstall the CIS, so everything I have is essentially surplus.[/QUOTE]
Thank You.
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1980 911sc Petrol Blue Metallic Targa, 300,000 + miles M&K Pre Muffler + M&K 1 in & 1 out Sport Muffler Previously owned and rebuilt: 60's VW Bugs, Buses & Ghias |
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09-10-2013, 05:42 AM
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1980 911sc Targa
1979 Porsche 911SC
0 
1974 Porsche 911 targa 2.7
