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Old 07-11-2009, 01:08 AM   #1
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Rear bumper/air tank

I started building my on board air tank earlier tonight.

A 5' length of 4'X4'X1/4" square tube, that lived a long life as the rear bumper of an XJ. It was open on the ends & it's brackets wouldn't work on my YJ, so I cut them off with an angle grinder.

So far I have cut it to length & made the end caps from the dropoff.

Took a few pics, & will take more tomorrow as I weld it up & mount it.

I figured the best way to mount it, would be to cut the bumperettes & use them as the standoffs.

Lacking a local supplier of half couplings I had to get creative.

I had one steel 1/4" NPT coupling I cut in half, & found some 1/2"-13 square nuts which I re-tapped with a pipe tap. These will serve as the four welding bungs, for the line fittings.

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Old 07-11-2009, 11:17 PM   #2
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Old 07-11-2009, 11:22 PM   #3
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Old 07-11-2009, 11:28 PM   #4
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Old 07-11-2009, 11:31 PM   #5
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Old 07-13-2009, 06:33 AM   #6
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All welds on this bumper were made with WELDZILLA!

Alternator/Welder


Link to York compressor build;
York OBA


.
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Old 07-13-2009, 11:11 AM   #7
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so short of indoor plumbing u can do almost anything with that rig when are u planing on doing a lift i really want to see what u come up with for a red neck lift i pried myself on being a redneck but u sir are about as good as it gets
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Old 07-13-2009, 08:45 PM   #8
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so short of indoor plumbing u can do almost anything with that rig when are u planing on doing a lift i really want to see what u come up with for a red neck lift i pried myself on being a redneck but u sir are about as good as it gets
Why thanks for the compliment!

Actually, I am pretty good at indoor plumbing. Able to glue PVC & CPVC & sweat copper fittings with the best of 'em.
Somehow though, I'm nowhere to be found, when it comes time to break open a soil pipe.

A little know fact; I've been toying with the idea of an on-board hot shower for many years now.
Nice for camping, you only need a good 12V pump, a couple of mixer valves, & a heat exchanger.

You run hot coolant through the exchanger tube/coil, & run fresh water (from the nearest lake/stream) through the exchanger jacket. This gets mixed with cold water from the same pump.

They sell these things in stainless steel, but I could make my own if I ever get the motivation to get started.



The lift is something I plan to do when I've saved up enough $$$$.

I want to do the whole deal at once, so I don't end up doing things twice.

Here's my parts list;
Driver's drop front D60-$2000.00
rear D60-IDK $400.00
lift kit-say $700.00+
re-gear ?????
tires, 35's? 37's Say $1000.00+
driveshafts?????
SYE-$300.00

So that's prolly not even close to everything I'll need & it adds up quickly.
Can't really skimp on that stuff either.

Never know though, maybe I'll find a busted "Lull" at the junkyard & get a cheap set of Rockwell's.

I try to do whatever I can afford at the time, & in some order of most needed.
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Old 07-14-2009, 09:36 AM   #9
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after i get done basically making a new stronger frame for my yj (i hate Wisconsin ) I'm going to try that rear bumper air tank but i don't know if I'll be able to find a compressor like that so i was thinking couldn't u just fill the tank and use it for at least tire inflation till i can come up with a system that would work
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Old 07-14-2009, 11:13 AM   #10
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wow, nice work! making it work with what what you've got, very creative.

Would it be possible to suck the bumper in even closer to the frame like actually weld it to the frame and getting rid of the 1/8 crossmember or would that interfere with the hitch?

again, very nice work. I keep saying that I wish I had fab skills. Maybe I will get me a welder and practice
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Old 07-14-2009, 02:02 PM   #11
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Looks good Bro.
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Old 07-14-2009, 08:55 PM   #12
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Quote:
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after i get done basically making a new stronger frame for my yj (i hate Wisconsin ) I'm going to try that rear bumper air tank but i don't know if I'll be able to find a compressor like that so i was thinking couldn't u just fill the tank and use it for at least tire inflation till i can come up with a system that would work
Well the York compressor came on many vehicles, but you may have to go through some junkyards to find the one you want.


Yes the bumper could be filled & brought along as a tire filler, but I don't recommend it. I drain my bumper out completely before hitting the highway, A rearend collision might cause it to explode if it's full of compressed air.


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wow, nice work! making it work with what what you've got, very creative.

Would it be possible to suck the bumper in even closer to the frame like actually weld it to the frame and getting rid of the 1/8 crossmember or would that interfere with the hitch?

again, very nice work. I keep saying that I wish I had fab skills. Maybe I will get me a welder and practice
It would interfere with my hitch, although I did give thought to doing just that. I could have cut the mounts off the hitch, then welded the bumper to the frame rails & welded the hitch to the bumper.

But if I'm ever towing something & get in a wreck, the first thing the plaintiff's attorney would say is "that hitch has been modified!"

Don't let the pics fool you, I have been a welder fabricator for almost 30 years. Anyone doing this mod should have some knowledge of what it takes to weld up a pressure vessel.
If you look at the 5th pic I posted you'll see that I've beveled the edges of the tube & the cap. There is also a gap around the endcap for penetration. I used E-6011 for the (keyhole) root pass, & two cover passes with E-7018.

Thanks for the compliments!

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Looks good Bro.
Thanks!
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Old 07-15-2009, 12:15 AM   #13
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yeah thats what i was thinking about after i posted that but oh well might just wait till i have the compresser first t hat way i wont have to sit at the gas station filling the tank al though i can already see the fun i could have screwing with people lol
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Old 07-15-2009, 03:31 PM   #14
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Looks good,What did the compressor come off? Great job with the pics. too.
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Old 07-15-2009, 08:43 PM   #15
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Looks good,What did the compressor come off? Great job with the pics. too.
The compressor that's on the jeep now, is one i got from a junkyard Mercedes Benz. It's the biggest CFM York, 210 IIRC.

All of the bracketry is from a 1981 Jeep Cherokee with a 258CID engine. This is the same as a 4.2L.

The brackets were on a friend's Cherokee, he was parting out. I actually got his York & am keeping it for a backup.

If you can find one (there were several models of jeeps & AMC Eagles that had this setup), take the entire belt/pulley/component setup.

Get the crank & water pump pulleys, the idler pulleys, the bolts the belts.

Grab anything you could possibly need, cause you might need to swap over the whole deal.
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Old 07-16-2009, 10:45 AM   #16
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what year Mercedes was that off of so i can go scrounging later while i wait to get my new frame rails
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Old 07-16-2009, 07:36 PM   #17
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what year Mercedes was that off of so i can go scrounging later while i wait to get my new frame rails
Damn, I cant remember if I even looked to see what year it was.

Here's a few links. The most important thing is to get the biggest CFM one you can The Yorks all have the same mounting pattern.

York OBA

York On-Board Air

OBA

On-Board Air Compressor

Converting AC to Onboard Air

http://www.ccicompressor.com/SrvcManl.aspx

http://www.jedi.com/obiwan/jeep/yorkair.html
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Old 07-16-2009, 09:00 PM   #18
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You simply amaze me.
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Old 07-17-2009, 10:59 AM   #19
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thanks that will get me close enough to what i need aloght of the junk yards around here are retarded so I'll probably have to personally go through their yards again
and I'll probably get the old answer i didn't even know that was out their lol
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Old 07-17-2009, 06:53 PM   #20
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You simply amaze me.
Thanks for the compliment, I guess I am getting pretty good at bookmarking the linky's!

Quote:
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thanks that will get me close enough to what i need aloght of the junk yards around here are retarded so I'll probably have to personally go through their yards again
and I'll probably get the old answer i didn't even know that was out their lol
Man, I refuse to go to those junkyards that bring your parts to the counter for you. If I can't go have the fun, then I ain't buying!

Even if I find what I want in the first 1/2 hour, I'll still stay for 2 or 3 more hours taking mental notes on what I might be looking for next time & where it's at.

Besides, it's good exercise walking & carrying a toolbox in one hand & a bunch of heavy parts in the other!
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Old 07-18-2009, 12:30 AM   #21
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yeah it can be fun but i dont have alot of time usually and i don't have set days off so it really helps if they at least know that theirs that type of car out their on the three acres that all I'm saying
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Old 07-19-2009, 12:58 AM   #22
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yeah it can be fun but i dont have alot of time usually and i don't have set days off so it really helps if they at least know that theirs that type of car out their on the three acres that all I'm saying
Take a look through those links in post 17, I think somewhere in those there is some list of vehicles. more importantly, there should be a key to reading the metal info tags on the Yorks.

Get real familiar with a photo of one of these compressors, so you'll know what they look like.

York's have a crankcase with oil, so you don't have to add oil before the compressor's intake. You only need to remove oil after the compressor outlet.

I use a coalescing filter from Grainger, & have a clear tube on the bottom of the filter bowl that connects back to the crankcase filler hole. (Hose Barb)

After it gets half full, I use ONLY 5 or 10 LBS. to shoot the oil back to the compressor's case. Using higher pressure to do this will blow oil through the pulley shaft seal.

All other vehicle A/C compressors need oil before the intake to prevent seizing.
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Old 07-19-2009, 10:47 PM   #23
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Ooooh! Thanks for the 5star rating!

Much appreciated.
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Old 08-19-2009, 03:38 PM   #24
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Would you build one for me if I paid you? If so how much and could you make it a little bit bigger to facilitate more air pressure as it is for a train horn.

Thanks
Nate
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Old 08-19-2009, 03:51 PM   #25
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Would you build one for me if I paid you? If so how much and could you make it a little bit bigger to facilitate more air pressure as it is for a train horn.

Thanks
Nate
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Old 08-24-2009, 09:34 PM   #26
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Would you build one for me if I paid you? If so how much and could you make it a little bit bigger to facilitate more air pressure as it is for a train horn.

Thanks
Nate
This would be overkill for just a train horn.

I wouldn't know what to charge, because I got the materials for free.

Seems to me that this 10 gallon tank, for under $40.00 would be perfect for your application.
Northern Industrial Air Carry Tank — 10 Gallon | Carry Tanks | Northern Tool + Equipment

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