Cobra EGR tube to Kooks header mod - TCCoA Forums
 
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post #1 of 9 (permalink) Old 06-02-2004, 08:21 PM Thread Starter
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Question Cobra EGR tube to Kooks header mod

I did a dry fit check of the Kooks headers I bought to put on the '99 Cobra motor that is going into my T-Bird. According to Super Coup Performance, the DOHC headers are really for a Mark VIII engine application. The EGR tube on the Cobra motor has a 90 degree bend at the last 4 inches before it connects to the cast manifold on the left side. I need to straighten this bend out so that it will go directly into the fitting on the Kooks header.

Does anyone know how to best bend this EGR tube out straight without kinking or breaking it? Or, is there a different EGR tube available to fit this situation?
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post #2 of 9 (permalink) Old 06-02-2004, 08:38 PM
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I have seen some installs use some that flexable tube used for gas connections.
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post #3 of 9 (permalink) Old 06-02-2004, 08:40 PM
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You can cut the tube and add some high temperature tube fittings to high temperature flex hose.



Or simply weld on an extension.



I prefer the weld on connection because it gives you less to go wrong. But it is harder.

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Last edited by J.Miller; 06-02-2004 at 08:47 PM.
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post #4 of 9 (permalink) Old 06-03-2004, 12:41 AM
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When we made the EGR tube for my 3.8L splitport swap, we used a torch to heat a length of tube and carefully bent it around a jig we made. But, if it kinks or cracks, it's time to start over.

Would the Mark 8 EGR tube work for your application? If not, you can try heating the tube in the area of the bend and carefully try to straighten it out.

Here is what I did with the EGR on my 4.6L DOHC swap:



1" thick billet aluminum blockoff plate. My only problem at the moment is finding a cap for the EGR bung on the Kooks headers. Anyone know where to pick one up, or what size the threads are?

-Rod

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post #5 of 9 (permalink) Old 06-03-2004, 06:17 AM
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Quote:
Originally posted by NRL
I have seen some installs use some that flexable tube used for gas connections.
I would think they would leak in a car where the motor is jerking and there is movement? No?

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post #6 of 9 (permalink) Old 06-03-2004, 12:54 PM
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Quote:
Originally posted by jordansypek


I would think they would leak in a car where the motor is jerking and there is movement? No?
No, if these tubes would leak that easily they would not use them so often in resturants and houses to hook up stoves and such. Even if it did, the motor can jerk all it wants, the header is connected to the motor and will jerk with it. The tube won't even feel any jerking caused from that other then that from inertia.
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post #7 of 9 (permalink) Old 06-03-2004, 01:18 PM
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Quote:
Originally posted by racecougar
1" thick billet aluminum blockoff plate. My only problem at the moment is finding a cap for the EGR bung on the Kooks headers. Anyone know where to pick one up, or what size the threads are?

-Rod
Should be a standard pipe thread I would think. Check the plumbing section of a hardware store. Just walk in with the header and start looking at caps and try them to see if they fit

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

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1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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post #8 of 9 (permalink) Old 06-03-2004, 01:23 PM
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Quote:
Originally posted by 4 Cam Bird


Should be a standard pipe thread I would think. Check the plumbing section of a hardware store. Just walk in with the header and start looking at caps and try them to see if they fit
Thats what I did. Just took my header into home depot and started plugging away. I believe it is a 3/4s though, standard thread.
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post #9 of 9 (permalink) Old 06-03-2004, 03:54 PM
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Hmmm. I picked up a 3/4" standard thread pipe cap a little while back, and it wouldn't thread on. I hope the threads on the EGR bung aren't messed up from shipping or ceramic coating. I'll have to take a closer look at it.

-Rod

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90 XR7-The Meth Addict-KB SC'd 5.0L DOHC Stroker
2004 Mustang GT-The Driver-Intake/Exhaust/3.73's
1995 F150 4x4-The Mud Toy-5.0L/4R70W/33's/Warn 8274 Winch
94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
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post #10 of 9 (permalink) Old 06-03-2004, 05:15 PM Thread Starter
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Does anyone know what material the stock EGR tube is made from?
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post #11 of 9 (permalink) Old 06-03-2004, 10:05 PM
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Simply plane Jane carbon steel.

The crimped fittings are known as sweagelock fittings and eventually they can leak because they are tightened by threads. Nothing beats a weld when it comes to longevity. Plus as Jordan points out hoses do flex causing fatigue wear.

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Last edited by J.Miller; 06-03-2004 at 10:11 PM.
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