OBA system

Post by **sanger** » Sun Feb 10, 2008 7:49 pm

Just thought i'd share my latest project. I've had a few slow days so i thought i'd piece together my own on board air system. I'll just be using a small 12v air comp to supply the air and i'll be using a pressure switch that stops at 150 psi and kicks back in at 100 psi. The air tank is a stainless steel fire extinguisher which i drilled and tapped to accept 1/4 inch air fittings. Well heres a sneak peak of what i've got done so far.

Post by **MightyMouse** » Sun Feb 10, 2008 8:05 pm

The receiver looks the goods, did you trim the bottom end to expose the convex dome ? Thee one I had didn't have a high enough pressure rating which was a bit disappointing.

But in my experience your going to be changing compressors very frequently. They don't mind pumping up tyres but in at 100 and out at 150 - make sure you pack a spare compressor or two - your going to need them.

Post by **CairnsZook** » Sun Feb 10, 2008 8:06 pm

Where are you going to mount the tank? In the back or underneath?

Post by **sanger** » Sun Feb 10, 2008 8:18 pm

Mightymouse: So what your saying is i'd be better off with a smaller pressure switch say 100 out to match what goin in.

Tank will be mounted directly above the tank. I.m planning to build a small platform for it to bolt to. The whole unit will be mounted behind the rear seat.

Post by **MightyMouse** » Sun Feb 10, 2008 8:27 pm

Yes - the lower the pressure the longer the compressors going to last IMO.

I used an ARB pressure switch ( 80 in 100 out and cheap ) as I needed to operate a locker. However I'm now on compressor number six - three big name brand and three others

Even running as pairs didn't help - fitted with check valves, unloaders etc etc.

Fitting an Endless Air currently but will leave the electric in as a backup.

I'm soooo over electric compressors.

I hope you have better luck than I did, but that's been my experience.

Post by **sanger** » Sun Feb 10, 2008 8:31 pm

cheers mate i'll see how it holds up otherwise ill buy a grande boss compressor which looks to be the real deal.

Post by **want33s** » Sun Feb 10, 2008 9:28 pm

I don't see a drain.
If you don't have a drain, you'll have a tank full of water before you know it.

Post by **NIK** » Mon Feb 11, 2008 4:37 am

I thought of making the inlet/outlet the same on mine but it was decided it wasnt the best idea to have them so close together.
Do you guys run them like that? It would definatley make it easier.
Why didnt you use the original threaded hole? Not critisizing but once again thats what I was going to do maybe its not a good idea?
Nik

Post by **Pinball** » Mon Feb 11, 2008 9:39 am

Yep,

gonna need a drain... and i think the reason for seperating input outpu is generally to smooth out the compressor "hammer" by using the tank as a buffer....

Spock

Post by **sanger** » Mon Feb 11, 2008 10:03 am

drain will be added before it get installed. As for the inlet outlet being so close i've seen numerous tanks set up this way with no sign of any problems. I am using the original hole i just tapped a few more for pressure switch.

Post by **Gwagensteve** » Mon Feb 11, 2008 10:03 am

The original threads used on extinguishers do not match pipe fittings so they're a PITA to work with.

Steve.

Post by **sanger** » Mon Feb 11, 2008 10:06 am

Gwagensteve wrote:The original threads used on extinguishers do not match pipe fittings so they're a PITA to work with.

Steve.

A 3/8 npt tap was cut into original hole.

Post by **NIK** » Mon Feb 11, 2008 6:57 pm

Cool thanks now Im motivated to get mine up and running!
Nik

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OBA system

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