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Old 01-11-2005, 09:18 PM   #11
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a cheap although rather labor intensive idea for those that do not have air brakes: You could go to the scrap yard and buy a compressor from a truck or bus that had air. It would be simple enough to fabricate a bracket to mount the compressor to your engine. My bus has one or two extra pulleys for accessories, hopefully you'rs is the same.

The most difficult part of the puzzle is the fact that most compressors require full pressure oil lubrication, and engine coolant to keep itself from overheating. The compressor utilizes oil and coolant from the engine. It's not too complicated if you're realatively handy.

I bought a compressor in perfect working order for $10 bucks.

Then you can run air tools or whatever you want.
*note: I'm not suggesting changing your brakes from hydrolic to air.
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Old 01-11-2005, 09:37 PM   #12
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Air front door?

one thing that got me thinking is what you sad about front door how did you rig that up?
was also woundering does your air bleed down when your bus has been off for a few hours like say the next morning after a trip resion i ask is mine does.
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Old 01-11-2005, 10:11 PM   #13
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a cheap although rather labor intensive idea for those that do not have air brakes: You could go to the scrap yard and buy a compressor from a truck or bus that had air. It would be simple enough to fabricate a bracket to mount the compressor to your engine. My bus has one or two extra pulleys for accessories, hopefully you'rs is the same.
An easier way would be with an electric compressor. Currie & ARB (also sold as Old Man Emu) make reliable, rugged, continuous-duty 150psi compressors that will (with a tank) run air tools. I'm planning a Currie compressor.

These are durable enough that the military uses them.
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Old 01-12-2005, 08:29 PM   #14
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Quote:
Originally Posted by Jarlaxle
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An easier way would be with an electric compressor. Currie & ARB (also sold as Old Man Emu)
EAsier yes, cheaper...NO.

Anyhow...Yes, the air pressure in my bus is pretty much gone in 24 hours or less. That's normal with most vehicles with air brakes. How fast is too fast to be loosing air when parked? That's a discussion for another topic. Even new trucks loose most of their air in a day. Some vehicles keep air for a week or longer, it just depends.

The front door on my bus was pretty simple to rig up. Basically, i replaced the stock bar that opens the door with a pair of air cylinders i got for free from some UAW employee. I isolated the air circuit for the door with a check valve that allows air from the bus system to feed the door, but the air from the door cannot leak back into the bus system. Then i installed a cheap 12 volt air compressor (less than 20 bucks) and a pressure switch that will keep the door system up to pressure and thus keep the frond door secured with a minimal amount of electricity. The compressor runs for a few seconds every 4 or 5 minutes. I turn the compressor off if the bus will be parked for more than a week to keep from draining the battery. Where i live, we dont' even lock our house doors, so leaving the bus unsecured at home is not a big deal. I conected the air cylinders to some electric solenoid valves that are operated with a remote keyless entry setup. I use the remotely operated door for the impression it makes more than I do for security.
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Old 02-05-2005, 05:55 PM   #15
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On board air

Another alternative is to use an Air Conditioning compressor- the piston types found in many pick-ups (I think they're called Worthington??) work great. Filter on the intake, pressure to a tank, add a pressure regulated on-off switch (my 120 volt version works fine), a relief valve and you're in business. Just check the oil level periodically- I believe they are an oil in sump type, but some may also rely on lubricity of the original freon. The GM rotary style compressors fry from lack of lubrication too easily- I think they expel the oil with the compressed air. This set-up is is a staple with the serious 4x4 crowd.
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Old 02-05-2005, 11:04 PM   #16
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An A/C compressor can be converted (I used one from a Wagoneer on my old Jeep J-20), but won't hold up to long-term, continuous use pumping air. I considered that for my bus, but will go with a 12V compressor instead.
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Old 02-05-2005, 11:42 PM   #17
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a/c compressors are very impressive indeed when it comes to the volume of air they generate, but as you said, they don't hold up long term.

I've been told the reason is that lubrication for the compressor comes from the freon under normal circumstances. Perhaps an oil supply that could drip into the inlet would help...i don't know.
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