Step 5: Which AC Compressor to Use?

Now there are three differnt AC compressors we can use.
A Sanden type compressor which is most likely already installed in your vehicle.
A York / Tecumseh 210 which were used in many from the 70's to mid 80's in many cars and trucks (volvos as a good source)
And the mopar RV2 which was used in many Chysler V6 and V8 cars and trucks from the 1960s to early 1980s

The sanden compressor requires the least amount of work, but does require you to remove your vehicles air conditioning. To use the sanden the AC system must be emptied of freon at a AC shop then a air line oiler is installed on the intake port and clutch wire is separated from the vehicles wiring harness. While this is the easiest route it is not the best as the sanden compressor will freeze up if not oiled correctly and does not pump as much air as a York or RV2.

The York compressor is a aluminum, twin cylinder air compressor with a oil sump which can come with V and serpentine belt clutches and comes in three models 207, 209 and 210. It can be mounted either upright or on its side depending on its location.
To identify the different models the clutch is unbolted then you look at the exposed crankshaft. A York with a shaft with a beveled edge is a 207, a shaft with a grove in it is a 209 and a shaft with a sharp edge is a 210. While any york will work the 210 model is preferable with its 10.2 cubic inch displacement. I've found the many Volvos carry the 210 model.

The RV2 is a heavy cast iron V twin compressor with oil sump and usually a dual V belt pulley. It requires more complex brackets than the York and has to be mounted upright and there is no serpentine belt clutch available. It also requires removal of a check valve from the intake. But is has a 12.5 cubic inch displacement and with its cast iron constructions I believe it can dissipate more heat and be run longer.

I am using the RV2 in this instructable as it is the first compressor I found, You can use which ever is easiest or available, because other than the mounting bracket all other instructions are the same.
<p>Man! To think I went and installed a VMAC under-the-hood air compressor. Far less gratifying than building one yourself and then teaching everyone else how to do it! Really awesome job on the Instructable. </p><p>How difficult is it to maintain this type of setup? Does it require a little extra TLC? I would imagine all the bumping and vibrating would mess with the makeshift mounting/connections.</p><p>I just recently posted my own Instructable regarding air compressor maintenance that maybe some of my fellow commentators might find useful. As for your on-board setup, I love the idea. I might have to throw one on my son's work-truck!</p>
Instead of idling up, wouldn't it be better to change the pulley sizes somewhat to doubt the RPM the welding alternator sees?<br><br>Also, can the welding alternator and/or air pump be setup to run in reverse? I am considering this modification for my fullsize Caprice wagon. It doesn't have a lot of room left alongside the engine, as I wish to retain my A/C, but I do have space in front of the engine, if the units could be flipped over and spun backwards.<br>
Dont know if you've recieved an answer to this yet but I figured I'd take a stab at it. <br> <br>If you rig/rewire your welding alternator the same way he did it then it should work when running in reverse. This is because alternators actually produce AC and then the diode pack rectifies it to DC, so running in reverse would change the phase sequence (the order the coils produce power in as the pulley rotates) but it gets rectified anyway. <br> <br>The compressor should also work in reverse I believe. The piston(s) would still only move up and down and if the compressor uses one way valves then it would still only supply air out one of the ports. Not sure if it would work the same with a camshaft to open/close valves. <br> <br>Good luck! <br>steve <br> <br>
I like this. I have an old Mercedes which does not have AC. I can stop dreaming about instaling AC to that one (a huge project, btw) and use the slot as a air compressor! Just finished building a stick welder from old microwave transformers, so a car welder would be the next logical project :).<br><br>All this, after the WVO-conversion is finished, that is... :/
Instead of dealing with the oiling situation, couldn't it be easier to get a air pump from a 110V air compressor? Granted you don't have the electric clutch, but I'm sure something else could be fashioned...
The oil-less 110v compressors are crappy and do not put out much air.<br><br>The oiled 110v compressors must be kept upright when running to insure proper lubrication.<br><br>Basically an A/C compressor is the best bet over finding an actual OBA compressor.
Very well explained! I have seen many threads on different offroad forums but yours has much better detail and answers a lot of questions.
is the 30 amp switch grounded or does it have + power from the battery?
So this removes your ac, could it be done with out doing that?
Do you have any info on using late model Mopar alternators?
I have seen this before and also helped a friend do this back in early 80's........works great too
i dont even have a air compressor a t home lol but i have a stick welder
When &nbsp;build my &nbsp;&quot;train hor&quot; I'll certainly keep this &nbsp;'ible in mind :)&nbsp;
Nothing like everything being in reach on the workbench LOL
nice ill half to try this with my work truck
now on that they have electric solenoids that can idle up an engine when current passes. you may look into that for the air compressor wire or when the alternator senses current flow. they are adjustable too. I'll look into that.
I'm installing a York 210 compressor, and i'll check around for materials to build your welder. Thanks a lot for this instructable. Arriero Chile
This is AWESOME! I've got a couple of old work/hunting trucks that need something like this. I think this'll be one of my first spring projects.
Got my vote!
I can remember when i finished my 'bike air horn ' i had a short burst compressor on it and i put a 'Push to make ' switch and filled the pipe up with BBS It was pretty funny and ran off a small battery i have
If you're ever looking for a heavier duty compressor setup in vehicle you could always run a direct drive one from a PTO alternatively we used the gearbox on our old iveco to run the crane, a hydraulic motor isn't hard to get a hold of, the downside is the engine needs to be at high revs for lots of power or it'll stall out, however it's a more useful power source than the electrical system if it's heavy usage... Interesting combination of tools though, you'd have pretty much everything covered. For less confident people or those that don't like the idea of putting a welder together you get a unit built for landrovers that might be of use, I've seen the fitted to various jeeps and they're a fully fledged powerful welder... Some more photos would be nice though...
I've seen the premade welder setups before, I'm uncle had a <a rel="nofollow" href="http://www.premierpowerwelder.com/">Premier Power welder</a> setup on his jeep, it was hard to pass up but I didn't have $600 to spare so why not build one. <br/><br/>I had a few more pictures but most were out of focus I think there must have been something on the lense that was screwing up the focus.<br/>
Ah right, fair does, those welders do come very cheap second hand, it was more a suggestion for people that weren't comfortable with making their own, or for working environments, if other people are using it they can be health and safety issues with homemade machinery, even if it's perfectly safe...

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