On board air

0311_DoC · **Posted:** Thu Jan 12, 2006 1:51 pm

Does anyone have on board air installed on or in thier KJ's? If so Id like to see where you all mounted your compressors .

Guyute1210 · **Posted:** Thu Jan 12, 2006 2:33 pm

I know a couple people that were putting them on the firewall where it would be in front of the passenger. I believe they were getting the ones that were sold at Checkers, but are now discontinued. I'm looking to put a compressor on my firewall, and an air tank either under the KJ between the rails, or under the passenger seat.

Jeepjeepster · **Posted:** Thu Jan 12, 2006 4:38 pm

He has a 2006 so his esp/traction/abs computer is mounted where they usually mount them.

WV(0)IIIIIII(0) · **Posted:** Thu Jan 12, 2006 4:52 pm

Mine sits in a little bag in the back. Cost $30 from Pep Boys and plugs up to the lighter.

Guyute1210 · **Posted:** Thu Jan 12, 2006 4:59 pm

WV(0)IIIIIII(0) wrote:

Mine sits in a little bag in the back. Cost $30 from Pep Boys and plugs up to the lighter.

Currently that's how mine is, only it's in a plastic box...hehehe :twisted:

ManicMechanicJoe · **Posted:** Thu Jan 12, 2006 5:05 pm

i got the same, considering a powertank though-they are supposed to fill tires mighty quick-worried about using it all on the trail and not having enough though

pixeldzn · **Posted:** Thu Jan 12, 2006 5:20 pm

ManicMechanicJoe wrote:

i got the same, considering a powertank though-they are supposed to fill tires mighty quick-worried about using it all on the trail and not having enough though

I have been reading about these over on the rubicon forum. Looks like even with 35" tires, they are filling a lot of tires before they have to get a refill. CO2 is very dense when in liquid form, so you can fit a lot in one of these tanks. I also read that it is much cheaper to go to a fire extinguisher supply, but your tank, and then get a regulator from a beverage supply house.

Here's the thread I've been following - it requires registration.

http://www.rubiconownersforum.com/phpbb ... ire+supply

ManicMechanicJoe · **Posted:** Thu Jan 12, 2006 6:09 pm

I geuss that makes sense. Is CO2 more dense then air when in a gas form? Will it make my tires heavier? is it as succeptible to temperature changes as air?

JacksJeep · **Posted:** Thu Jan 12, 2006 10:25 pm

I have a 10lb CO2 bottle. It has been used to inflate my 245/75R16 tires (all four) at least 6 or 7 times and it's still not empty.

Cacher123 · **Posted:** Thu Jan 12, 2006 10:28 pm

I have a SCUBA tank I use with an air adaptor on my regulator hose. At 3000psi it should last quite a while. Plus tanks are cheap.

Jeepjeepster · **Posted:** Thu Jan 12, 2006 10:39 pm

Cacher123 wrote:

I have a SCUBA tank I use with an air adaptor on my regulator hose. At 3000psi it should last quite a while. Plus tanks are cheap.

Holy crap, are they really at 3k psi? Thats amazing. What happens if it explodes in the jeep? I would never keep something with that much pressure in the jeep, what would happen if you got hit and the tank was crushed? :shock:

Cacher123 · **Posted:** Thu Jan 12, 2006 10:48 pm

Shrapnel city!! :shock:

If I get into an accident bad enough to crush the SCUBA tank, I think that's the last thing I'd be worried about.
Plus they have a pop off valve so if they should overheat the valve blows. Very rare and usually only happens in an overfill situation then added heat. The tanks are tested for, I believe, 4500 psi.

Tokyojoe · **Posted:** Thu Jan 12, 2006 11:41 pm

I love Mythbusters.......

They took a highly pressurized tank and shot it with a high powered rifle. No explosion. It did fly around everywhere doing some serious damage.

GPR65 · **Posted:** Fri Jan 13, 2006 12:49 am

i have a 10 lb tank also and it is great! I always use it. It is great for air tools. You can change a tire so quick with an impact wrench. It seems to last forever also. Safe? I have had it in my jeep for over a year and during the hot days here in florida and no problem.

Chris

Myke · **Posted:** Fri Jan 13, 2006 1:02 am

Jeepjeepster wrote:

Cacher123 wrote:

I have a SCUBA tank I use with an air adaptor on my regulator hose. At 3000psi it should last quite a while. Plus tanks are cheap.

Holy crap, are they really at 3k psi? Thats amazing. What happens if it explodes in the jeep? I would never keep something with that much pressure in the jeep, what would happen if you got hit and the tank was crushed? :shock:

I have paintball compressed air tanks at 5000 psi at my old job our compressor went up to 6500 psi

(it exploded once)

corwyyn · **Posted:** Fri Jan 13, 2006 1:15 am

Cacher123 wrote:

I have a SCUBA tank I use with an air adaptor on my regulator hose. At 3000psi it should last quite a while. Plus tanks are cheap.

Any more details on this setup? Sounds like you could do one for a reasonable price. Do you need a certification to purchase the SCUBA tanks?

Cacher123 · **Posted:** Fri Jan 13, 2006 3:24 am

No cert required. Some dive stores MAY require u to have a cert to fill it. Depends on them. You only need the cert to dive with a certified dive boat or group. Unless u have an existing regulator though or can find a first stage used (usually pretty cheap on ebay since u aren't worried about it's usability for diving) you may have a bit of an expense there. Basically all those commercially sold on board air tanks 4 wheelers have are lower pressure SCUBA tanks set up to use a different type valve/regulator assy and filled with CO2. A pressurized air tank is a pressurized air tank regardless of what u use it for. The only diff would be the working pressure and the type of valve/hose setup.

I just read up on "The Source" which seems to be the popular off road air setup. All it is is a standard 1800 psi rated tank set up with a standard valve and an air line. A SCUBA tank would work just fine and since the working pressure of a CO2 setup is only around 800-900lbs you would be well below the safety margin. An AIR fill at a dive store would cost around $3-$4 dollars whereas a CO2 fill seems to be around $12-$15. Of course as I stated earlier, a SCUBA set up would require the purchase of a SCUBA regulator setup and and while I don't see any problem (maybe freezeup) using a SCUBA setup with CO2 you may have a problem finding a CO2 seller who would fill a tank with a SCUBA valve. I don't think the fill equipment is compatable but I may be wrong.

You could probably buy a used SCUBA tank and a new CO2 valve & compatable hose/fittings for about 1/2 the price of a commercial setup if u wanted to go the lower pressure co2 route.

In this image you can clearly see the 1800 psi rating on the tank.

Cacher123 · **Posted:** Fri Jan 13, 2006 4:06 am

There is sorta a thread here talking about building one cheap:

http://www.pirate4x4.com/forum/showthread.php?t=330635

What I thought was interesting is that someone posted that u can get a co2 tank from a soda distributer for a deposit fee and then exchange it for a full one real cheap.

Quote:

For a tank the cheepest way to go by far is to call your local pepsi/coke distributor. They will give you one for a deposit and can refill or exchange after that.

I can get the big tank from my pop distributor in town for a $20 deposit and then exchange it for a full one for $12.

Stop by harbor freight and get a hose and a tire filler and a couple quick releases and you are filling tires like a fool for well under $100.

Wasatch15 · **Joined:** Wed Jul 13, 2005 7:52 am **Posts:** 242

From the information I read before purchasing a 10 lb. CO2 tank. Having a full 10 lb. CO2 cylinder is equal to a 640 gallon air tank @ 120 psi.

pixeldzn · **Posted:** Fri Jan 13, 2006 10:16 am

Found this after doing some more looking. Very good read. He even talks about using these cool "scuba skins" to improve the appearance of the tank. If we get 10 guys who would buy one, we could do a custom LOST design as well.

http://www.stu-offroad.com/recovery/co2/co2-1.htm

On board air

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