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Old August 18th, 2011, 09:46 AM
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Chris Velardi
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Chris Velardi
1975 101FC
Join Date: May 2009
Location: Hamden, CT USA
Posts: 424
If you do really want to use the rear cross member for air, oil, or any other liquid reserves , make sure the inside of the tube is thoroughly coated with a sealer (fuel tank sealers are good, I poured in POR15 and rolled the tubing around to coat all surfaces. Normal compressed air unlike Nitrogen contains a lot of moisture and it will rust out the inside of the tube (take a look at some of the old stand up commercial air compressor drain valves some time (usually filled with rusty water) and I have to tell you to get a perfectly air tight weld with a mig is almost impossible (but the POR15 could help seal these weld joints also)

Chris "V"
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Old August 18th, 2011, 04:58 PM
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Tom Rowe
Join Date: Feb 2006
Location: Atlanta, GA USA
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Originally Posted by cgalpin View Post
as I get older I start thinking of these things as being unwanted complexity and failure points.
It depends. Using it for something "mission critical", IMO, is evidence of not thinking things through. But using it for compressed air storage (I assume for lockers or air tools) or oil for oil changes while traveling would just be an inconvenience if they failed. Not a show stopper at all.
So yeah, using it as part of your cooling system is pretty dumb IMO.

Originally Posted by Chris Velardi View Post
I have to tell you to get a perfectly air tight weld with a mig is almost impossible
Actually I've welded a number of pressure vessels using MIG. On the other hand, I was an ASME certified pipe weldor at the time. If you have good technique it's easier than stick.
That said, for most people I would tend to agree.

Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
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97 D1 Automatic
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Old September 7th, 2011, 08:44 AM
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Ken Loy
1994 Portofino Red ST
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Dana, Where are you with fabricating for others?
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Old September 11th, 2011, 09:37 PM
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Chris Davis
94 D90, 88 RRC
Join Date: Nov 2003
Location: Colorado
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Don't forget a drain valve to drain moisture if using for compressed air.
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Old September 12th, 2011, 07:12 PM
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Frank Battersby
95 D90
Join Date: Sep 2009
Location: NJ
Posts: 93
That's looking great Dana!

'95 Soft Top
'89 Classic Tdi
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