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 4Likes
08-02-2015, 11:35 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
All the tanks that I have been installing are stainless steel construction.
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08-02-2015, 11:39 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
Here is a photo of a 42 gallon stainless steel tank installation on a 6000 Series Cobra that is in my shop for additional work....
Last edited by CompClassics; 08-02-2015 at 11:48 PM..
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08-02-2015, 11:50 PM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
I've pushed my Cobras in/out of the garage and I can tell by the sloshing sound that there's no foam inside. Honestly, I can't tell what the tank is made of on the Shelby, it's coated in a black crinkle. Sounds like steel when I tap it.
My company makes fuel bladders for drones, including R&D'ing next generation Self Sealing bladders. The 50cal was easy. A 20mm and 23mm... tumbling... causes real havoc. The reticulated foam we use is the latest and greatest, but only tested on JP-5 and JP-8. If I was a little more daring...
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rodneym
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08-03-2015, 10:27 AM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,600
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Not Ranked
Quote:
Originally Posted by Bernica
Next hint will be the leaking from the edges of the tank because they weren't set up or tested to hold fuel since they had a cell.
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I expect the foam starts to disintegrate before the bladder will fail.
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Cheers,
Tony
CSX4005LA
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08-03-2015, 11:32 AM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
Quote:
Originally Posted by twobjshelbys
I expect the foam starts to disintegrate before the bladder will fail.
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That is true, but the bladder does eventually give way, especially at the corners. And in the case of a 42 gal CSX tank, there are many corners.
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All that's stopping you now Son, is blind-raging fear.......
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08-03-2015, 01:31 PM
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CC Member
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Join Date: Jun 2006
Location: Las Vegas,
NV
Cobra Make, Engine: 427 SC
Posts: 388
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Not Ranked
The 8000 frames I built used a fuel cell that was more or less the same width as an original Cobra. 7000's were narrower to fit wider rear tires. I don't know of any 8000's that were narrowed.
Quote:
Originally Posted by CompClassics
I've done several conversions to baffled stainless fuel tanks on the 7000 Series, the 7000 & 8000 Series are more labor intensive than the 4000 & 6000 Series Cobras which just drop out the bottom. Shelby also used narrower (less volume) tanks on the 7000 & 8000 Series Cobra, I have been installing full size tanks (photo above) which have increased the range for the owners. I have not spoken to one owner that was aware of the limited life of the fuel cell in their Cobras.
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08-03-2015, 02:44 PM
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CC Member
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Join Date: Feb 2007
Location: Riverside CA,
ca
Cobra Make, Engine:
Posts: 600
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As long as you are giving out warnings based on age...
I was shocked to read that fabric seat belts and shoulder harnesses have a fairly short shelf life so I'd replace those if they came on the car when you got it. I am sure occasional exposure to gasoline rots them further.
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08-03-2015, 04:44 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Quote:
Originally Posted by Historybuff
I was shocked to read that fabric seat belts and shoulder harnesses have a fairly short shelf life so I'd replace those if they came on the car when you got it. I am sure occasional exposure to gasoline rots them further.
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Nothing shocking there,NHRA has been mandating for years and years now that seat belts can not be more than 2 years old, most road racing sactioning bodies allow seat belts up to 5 years old!!!!!!!!!!!!!!!
David
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DAVID GAGNARD
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08-03-2015, 04:46 PM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Check that old helmet too. They have a date code... 
__________________
All that's stopping you now Son, is blind-raging fear.......
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08-03-2015, 04:49 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
Quote:
Originally Posted by Bernica
Check that old helmet too. They have a date code... |
Yes they do, IIRC, NHRA is 5 years and road racing is 10 years on the SNELL Rating date.....
David
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DAVID GAGNARD
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08-03-2015, 07:44 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,600
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Quote:
Originally Posted by Historybuff
I was shocked to read that fabric seat belts and shoulder harnesses have a fairly short shelf life so I'd replace those if they came on the car when you got it. I am sure occasional exposure to gasoline rots them further.
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So I guess you didn't see the date punch out on your harnesses? If they were real Simpson etc. they are date coded and a statement of life. Tech inspection at all tracks I know of will flunk you if your harnesses are expired.
The reality is that standard auto belts survive in the same environmental conditions for longer periods of time (did you replace the seat belts in your 1973 CHEVELLE?)
I did replace (reweb) the harnesses in my Cobra though. This was because one of the leather guards behind the duck bill failed and I sent the belts (both sides) and they essentially replaced them for the reweb fee.
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Cheers,
Tony
CSX4005LA
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08-03-2015, 10:14 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
Kris
The narrower rear tank was in theory for wider rubber, problem was that the rear subframe were never narrowed to match the tank width. Instead SAI welded in a couple of pieces of angle iron and used a couple of "T" bolts to secure the tank inboard of the original subframe assembly.
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08-03-2015, 10:26 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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.......this was a problem as the leaf spring compressed when going over a bump it would drive the spring into the "T" bolt and bracket, bending the bracket up into the bottom of the fuel cell. The bracket closest to you is the original subassembly the jury rigged bracket is behind it and bent upwards...
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08-13-2015, 11:14 AM
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CC Member
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Join Date: May 2004
Cobra Make, Engine: CSX6363
Posts: 180
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Quote:
Originally Posted by mickmate
I've only seen the aluminum can fuel cells. Are the SS ones cells or tanks?
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Mine was delivered w/a SS tank. |
08-17-2015, 07:49 AM
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CC Member
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Join Date: Feb 2010
Location: Hermosa Beach,
ca
Cobra Make, Engine: ERA#520, Roush 427SR
Posts: 203
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Not Ranked
CSX4017 ( built 2007 ) came with a fuel cell. I am replacing it with a 24 gallon baffled aluminum tank from Nick. The fuel cell is being replaced because of impact damage not internal bladder/ foam failure. The fuel cell had 6 1/2 years of use without any obvious signs of deterioration. No clogged filters or leakage. Very surprise about the longevity. Racing friends indicates that bladders are the first to fail.
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08-17-2015, 01:01 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
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08-18-2015, 12:31 AM
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CC Member
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Join Date: Jul 2014
Location: Sioux Falls,
SD
Cobra Make, Engine: CSX 4145, aluminum body and Shelby aluminum FE stroker
Posts: 121
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Not Ranked
So are ALL of the CSX 4000's affected? I have CSX 4145, built in 2000 or 2001, I believe. As far as I know, the tank has never been replaced, but who could say? I've only owned the car for about a year. Did some of these just come with a fuel tank, instead of a fuel cell? Is there an easy way to check and see if I have a problem to watch out for, or perhaps proactively deal with?
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08-18-2015, 06:15 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Take a peek underneath where the fill tube connects to the tank on the right rear or the pickups and sender are on the front center. If they are bolt on plates for those it is a cell. Cells often have small holes in the corners to allow the bladders to sit right in there without taking up fuel capacity with air.
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08-18-2015, 10:02 PM
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CC Member
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Join Date: Jul 2014
Location: Sioux Falls,
SD
Cobra Make, Engine: CSX 4145, aluminum body and Shelby aluminum FE stroker
Posts: 121
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Not Ranked
Thanks everybody, for the helpful warning, and the information (especially Craig/CobraKiwi, for the helpful message).
Well, I am a little confused. Since my car has a FuelSafe decal right on the junction plate (see photo), it appears that it must be a fuel cell, but yet the unit does appear to be welded at all of the seams, so.... tank or cell?
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08-18-2015, 10:21 PM
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CC Member
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Join Date: Feb 2013
Location: Carlsbad,
Ca
Cobra Make, Engine: SAI FIA, 289HP (5-bolt), 48IDA Webers
Posts: 1,244
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Not Ranked
Here is a photo of a 4000 Series fuel cell, the metal shell of the fuel call is usually pop-riveted together...as far as replacing the fuel cell with an aluminum fuel tank on a 427 Cobra I would have second thoughts, I'm sure that most of you have seen the movie "Gumball Rally" remember the van that ran over the tail pipe? It wouldn't take much to open up (damage) an alloy fuel tank that is very exposed to road debris and spill its contents all over the road.
Last edited by CompClassics; 08-19-2015 at 08:38 AM..
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