CHeap on board air.....

pictures are self explanitory... I got the idea somewhere on line(maybe from here.) but can't remember where.. anyway.. thanks to them.

the rack is my own twisted creation.. it has shelves and a pull out drawer.. I hadn't installed them when I took this pic.

I got the two compressors from a U Pull it for $10 dollars a piece. They came out of late 80's early 90's caddilacs. I added a check valve to also.. it's the brass fitting on the end of the tank. the lines from the compressors are high pressure fuel line and a pvc tee. I still need to find a CHEAP adjustable pressure switch.. right now I only bring it up to 75 psi...and turn it off with the switch.



Notice the cool spongebob accessories.. courtousy of fathers day Switches for electric fan and compressors. I used a relay with the switch.


Notice Cool welding job on my rack for the back... NOTE TO SELF.. NEVER WELD ON Galvanized steel again..

What kind of pumps are those, besides caddy? what were they used for on the caddy.

FYI,

That tubing looks like EMT.

If so it is galvanized and welding it puts off some very toxic fumes. Not a good thing to do.

mark
orgs mfg

Mark Hinkley said:

FYI,

That tubing looks like EMT.

If so it is galvanized and welding it puts off some very toxic fumes. Not a good thing to do.

mark
orgs mfg

Click to expand...

I guess you didn't read my writing above the last pic. I know it was galvanized... I was outside.. upwind (or is it down ) and I was holding my breath..

M. Lake said:

What kind of pumps are those, besides caddy? what were they used for on the caddy.

Click to expand...

Air ride suspension.

you could use a pressure switch for arb,on at 85 off at 105

trailrunner said:

you could use a pressure switch for arb,on at 85 off at 105

Click to expand...

are they CHEAP?

Isn't that a pressure switch coming out of the tank on that little piece of tube? :dunno: Why don't you use that? Just run your power to one side,and hook the compressors to the other side and you have a pressure switch setup.

Another possibility for a pressure switch is to find one from an old water pump. they often turn up. You can reset it for higher pressure, or even modify the springs if you want extra pressure.

Georgia Mike said:

Isn't that a pressure switch coming out of the tank on that little piece of tube? :dunno: Why don't you use that? Just run your power to one side,and hook the compressors to the other side and you have a pressure switch setup.

Click to expand...

That is a 110v pressure switch that is non adjustable(set at 100 psi) switching 110v switches with DC current is not a good idea..

It doesn't matter! The only thing I would do different is use the switch in front of a pair of 30 amp relays ($5 at Radio Shack) to handle the load. The switch will indeed switch a 12 volt source. The important thing to remember is that with every drop in current,amperage is increased. For example:

A 110 volt hair dryer would normally use 4-5 amps. If you decrease the volts by 10X,you get approximately 10 times the amperage for the same hair dryer,which would make the hair dryer draw an approximate 40-50 amps @ 12 volts.

Use the toggle switch you have (which, by the way is dangerous as hell at that type of load w/o relays to begin with) and use it to energize the pressure switch. Hook the other pole from the pressure switch to the pair of relays as the trigger wire. Run a dedicated *fused* power wire to the relays as the main power source,and a ground to the closest point possible (remember--12V flows from - to +,not + to -,so make your grounds as short and large as is possible!). Hook the pumps up,one to each relay output,and you're set up!

Why are you worried that the switch is set at 100 PSI anyway? Will the pumps not pump that much air? 100 PSI is perfect for just about anything you'd ever want to run on air. You have to understand my logic,here. I'm not trying to be a jerk or anything. I'm just a firm believer in the K.I.S.S. principle

Georgia Mike said:

It doesn't matter! The only thing I would do different is use the switch in front of a pair of 30 amp relays ($5 at Radio Shack) to handle the load. The switch will indeed switch a 12 volt source. The important thing to remember is that with every drop in current,amperage is increased. For example:

A 110 volt hair dryer would normally use 4-5 amps. If you decrease the volts by 10X,you get approximately 10 times the amperage for the same hair dryer,which would make the hair dryer draw an approximate 40-50 amps @ 12 volts.

Use the toggle switch you have (which, by the way is dangerous as hell at that type of load w/o relays to begin with) and use it to energize the pressure switch. Hook the other pole from the pressure switch to the pair of relays as the trigger wire. Run a dedicated *fused* power wire to the relays as the main power source,and a ground to the closest point possible (remember--12V flows from - to +,not + to -,so make your grounds as short and large as is possible!). Hook the pumps up,one to each relay output,and you're set up!

Why are you worried that the switch is set at 100 PSI anyway? Will the pumps not pump that much air? 100 PSI is perfect for just about anything you'd ever want to run on air. You have to understand my logic,here. I'm not trying to be a jerk or anything. I'm just a firm believer in the K.I.S.S. principle

Click to expand...

The pressure switch CHATTERS if you use DC... trust me.. AC and DC relays and some switches are not compatible.. and this one isn't.

Who said I didn't have relays.. READ MY TOP POST AGAIN. .

thanks for your informed opinion.

:anon: My opologies! Did not see that before! And I wasn't trying to preach,although I did. :thumbup:

Georgia Mike said:

:anon: My opologies! Did not see that before! And I wasn't trying to preach,although I did. :thumbup:

Click to expand...

No need to appologize... my thanks was sincere.

Cool! Good luck with the rest of your project

I have one of those Caddie pumps, it's not fast but builds treminous pressure. I have a Square D pressure switch ($20.00) It turns off at 100 on again at 80.

sweet. 20 bucks for a pressure switch... niiiiiiiiiiiiiiiiiiiiiiice.

Yes they are kind a slow... but do the job.

check your original post, the pics arn't working and i would like to see them RINGKONG

cheers
-V-

vsh said:

check your original post, the pics arn't working and i would like to see them RINGKONG

cheers
-V-

Click to expand...

Sorry that is just my canadian filter kicking in.... it filters out anybody remotely associated with french culture......

Just kidding.. its back up..

What's the model of the caddie? Looks like a great idea. I'm surprised I never thought about it.