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spence88mph's Avatar
 
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Stretched slip joint, repairable or scrap?

Hey Guys, when I was fitting my OBX headers one of the pipes was out of alignment which I bent into place quite easily but managed to stretch and damage the slip joint by levering it too hard so it now has a slight bit play when the headers are off. For 8 months the joint hasn't leaked but has just started. Is it possible to tighten it up or should I just scrap it, after all I can replace them for $390!

BTW: I have been very happy with these el cheapo headers, hey still look great.
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'89 911 M491+Turbo
'89 944 Turbo
'88 928S4
'18 C63S Coupe
Old 09-04-2008, 05:45 AM
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Macht Schnell
 
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Hi,
Where can you get them for $390?
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 09-04-2008, 06:14 AM
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Spence, maybe you should open up the pipe that's too small. Just a thought as it's quite hard to make a tube smaller without cutting and then welding it back up. I guess you could also get it built up.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 09-04-2008, 09:22 AM
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OFF THE BOOST PIPE NOW...
 
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stick a muffler clamp on it...
Old 09-04-2008, 06:06 PM
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yeah, or just squeeze it back down with a muffler clamp and then remove it. heat it first if you have to.
Old 09-04-2008, 08:17 PM
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thanks for the replies guys!

I will try an exhaust clamp, if that fails I'll open the small one up...

les, you can get them on ebay for under $400. baaaargain!
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'89 911 M491+Turbo
'89 944 Turbo
'88 928S4
'18 C63S Coupe
Old 09-06-2008, 09:46 PM
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OFF THE BOOST PIPE NOW...
 
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Use a good self locking nut so it won't back off. Or double nut it.
Old 09-07-2008, 02:21 AM
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I shouldn't drive it with the exhaust clamp on though right? It wont allow expansion?

When you guys say exhaust clamp are you referring to the u bolt style or the wrap around with one bolt?

Thanks again!

This:


Or:
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'89 944 Turbo
'88 928S4
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Old 09-07-2008, 02:31 AM
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I don't think clamping is the way to go for some reason.

Out of the two the last one is more suitable.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 09-07-2008, 05:38 AM
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The reason it is not good to clamp the slimp-joint is because the engines grow dimensionally from cold to engine operating temperatures. The exhaust port distances from one another (left bank to right bank) is very measurable. If you clamp the slip joint, it will stress the headers and stress cracks will develop on the heater boxes, if you have them, and worse, the collectors and the exhaust port flanges.
I was thinking of modifying mine when I take mine off to fix some cracks in the welds with this approach. These are used a lot in transverse mounted engines exhaust systems. Of course, fabbing it will be a nuisance, but at least it will handle expansion contraction better. What do you guys think?
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 09-07-2008, 08:28 AM
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Hello,
I've never seen anything like that before! Where do you get those at? Do you weld it in?
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 09-07-2008, 08:56 AM
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Les,
I found them on Summit Racing's web site, but you kind find them just about anywhere. Napa Auto Parts and all the other's would have them. I just picked Summit because they happen to have a pic.
I was thinking of welding on one end, then clamping the other end.
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P

Last edited by WERK I; 09-07-2008 at 09:05 AM.. Reason: added answer to Les's question
Old 09-07-2008, 09:04 AM
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Quote:
Originally Posted by WERK-I View Post
Les,
I found them on Summit Racing's web site, but you kind find them just about anywhere. Napa Auto Parts and all the other's would have them. I just picked Summit because they happen to have a pic.
I was thinking of welding on one end, then clamping the other end.
Pretty slick, I must say! I haven't looked at a Summit Catalog in a while.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 09-07-2008, 09:12 AM
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WERK-I I have seen that style expansion joint on a set of 930 headers, I'm quite sure the headers came with it and have been on the car it's whole life. I thought they were B&B headers, I'll get a pic. I was thinking the same thing, cutting the slip joint out and using one.
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'88 928S4
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Old 09-07-2008, 01:28 PM
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Hmmm, OK, I have a question, that either of the end flanges look "Un-clampable" how are you going to accomplish the clamp on either of hose ends?? Looks like billet ends.
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 09-07-2008, 08:44 PM
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they're welded on
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'89 911 M491+Turbo
'89 944 Turbo
'88 928S4
'18 C63S Coupe
Old 09-07-2008, 08:46 PM
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That looks a much better solution. I first saw these years ago on my dads '86 Rover Sterling, they had a honda V6 engine in them and the engine was great.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 09-07-2008, 11:54 PM
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I used the pic above as an illustration. They come in different diameters, lengths, clamped/welded. Personally, I don't like the clamped type....looks rather tacky. On the other hand, if both ends are welded, it makes the fitment and mounting more of a PIA, since the headers now become a virtual one-piece assembly. Maybe welding one end and using a clampable sleeve is the best route.
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P

Last edited by WERK I; 09-08-2008 at 07:18 AM.. Reason: bad grammar ;)
Old 09-08-2008, 07:17 AM
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Thought

Do you have a picture of the slip joint in question? What if you clamped temporarily and once they went through a few heat cycles you could take off the clamp and they would stay in that position?

Just thinking out loud and thinking that you may only need the clamp for a short time.

Bryan
Old 09-08-2008, 08:47 AM
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