Jun Air Compressors: Off-topic discussion forum: Grassroots Motorsports Magazine

Subscribe get a full year for only $23.95 Sample Free Test Drive—no strings attached

May 25, 2011 7:43 a.m. Grtechguy SuperDork
Does any one have any experience with them?

I've been offered one with a semi-faulty pressure relief valve (sometimes doesn't reclose)

But, basic specs are:
- 150 psi - Full charge in under a minute
- 2 separate motors with twin cylinder compressors on each
- 220v
- built in air-dryer
- 20 Gallon? tank.
- Just over 3000 hours according the meter
- fully enclosed cooled cabinet
- virtually silent...My Dishwasher is louder...I was standing next to it running and could just hear it.
So, this was used in an Ophthalmology office in a past life. Is it useable for power tools? can a larger tank be piggy-back on for more air supply?

looks similar to this:
May 25, 2011 7:55 a.m. John Brown SuperDork

IIRC they use 1/4" or smaller lines, have a great little rotary compressor head and are medical grade reliable. Buy it and use it for your air powered Dremel-like tools.
May 25, 2011 10:59 a.m. cwh SuperDork

can a larger tank be piggy-back on for more air supply? This
May 25, 2011 12:18 p.m. benzbaron Dork

Apparently they are bitchin quite compressors. I have one that my Father got from his work, I'm still trying to get it to work. After the last attempt something is definitely wrong in the motor. It gets hot but won't kick it. An oil change with jun air oil is about 75$, and there isn't anyone who can service it. I talked to one shop and they send broken ones down to Santa Ana or some damned place.

The issue with Jun Air is it is a Danish company so parts and service seems to be fare and few between. If you can get it to work cheap do it, if not don't. I don't see a compelling reason to spend lots of time and money on one as there are other compressors with similar features which would be easier to live with.

You are buying the wrong compressor for power tools if that is what you are going to use it for. If by power tool you mean tattoo needle, airbrush, or dental drill, but I doubt it pushes a lot of CFMs for your die grinder, impact, etc. These compressors are designed to be quite for small applications not designed for running big tools.

Good luck!
May 25, 2011 2:07 p.m. Grtechguy SuperDork

well..."buying" is the wrong word

What makes CFMs? the supply tank?

I have a porter cable 29 gallon single stage unit now.
May 25, 2011 3:31 p.m. John Brown SuperDork

Grtechguy wrote:

What makes CFMs? the supply tank?

No the compressor head input and output. You would not be able to operate a board file or DA sander, but you should be able to power an efficient grinding tool or an airbrush pretty effectively. The relief valve should be able to be serviced at most compressor repair shops (Lansing has a good one). I would be interested in seeing the CFM the compressor is rated at.
May 25, 2011 3:48 p.m. motomoron HalfDork

They're quiet and clean and very, very expensive. Typically only used in medical or lab settings. Relatively low CFM ratings at the pressures us cavemen us.

For your "in the house" compressor it's perfect. For the garage or fab shop it's way less than ideal.