eBay compressor

[redtrucker610]

Bizill that probably would have given me scary moment also until I realized what had happened.

[Bizill]

It truly sucked in that moment as I had been anticipating this little compressor oddly enough more than I had anticipated any of my airguns delivery.  My stomach almost turned in that moment and in rushed all those times people utter the phrase, "you get what you pay for."  Luckily for me, or most of us, these compressors seem to, as stupid 0bama would say (the same exact to multiple leaders) "punch above their weight."

[redtrucker610]

Yeah, thats an "O" &^^& moment.

[kzz1kaw]

For those that are still on the fence about buying a yong heng compressor, here is a link on eBay for under $300 shipped
http://m.ebay.com/itm/High-Pressure-30MPa-Compressor-System-Rifle-PCP-Electric-Air-110V-or-220V-/182665900863?_trkparms=aid%253D222007%2526algo%253DSIC.MBE%2526ao%253D1%2526asc%253D20150519202348%2526meid%253Dc01378f5c6bf4f8fb2aaef2ed388cc25%2526pid%253D100408%2526rk%253D1%2526rkt%253D25%2526sd%253D272644276527&_trksid=p2056116.c100408.m2460

[Richard Lee]

I was able to check out my new YongHeng compressor today.
I ran it a little while under no load and watched how fast the heat was climbing.
Used a 47Ci 3000PSI paintball tank for my first test.  From zero pressure, bled the air and stopped (4 times)
at 1000, 1500, 2000 and stopped filling at 2800 PSI.
Did not get any water spray when bleeding. The relative Humidity was 45% in the basement.
I checked the (cotton) filter and it felt dry. There was a thin 2mm wide oil stain on the filter.
After each run, I checked temperatures with my heat sensor pistol.  The top of the head stayed cool.
While the bottom gets really warm.. 40 to 50C comes quickly. After turning off, the cast iron (lower head)
stays hot for about 5 minutes (room temp was about 21C), the aluminum top part is at 20C within a minute.
 
My PRod was down to 1,000 PSI.. I realized that my muzzle extension had to come off the rifle,
because of that large black filter wouldn't allow the quick-connector to line up and snap on..

My next surprise was the short amount of time it took to go from 1000 to 3000PSI.
After I started it, I stepped over to look at the KillaWatt meter (I think it was around 15 amps)!
When I turned around, the YH pressure gauge was already nearing 3000.
I quickly opened the bleed and hit the power off. The gauge on the PRod was just over 3000PSI.
It seemed like this top-off only took about 15 seconds.
My advice to pistol shooters, stay on very close and be ready to shut it down..


For cooling, I was using 4 or 5 gallons of water (without Water-Wetter) in our Ice Chest. (insulated).
When I was done, the water had gone from 20 to 21C.

I believe topping off the PRod can be cooled with a 1 gallon water bucket, 5 gallons isn't needed.
Not sure about topping off my rifle (.22cal AT44-10 QE), but my guess is, going from 2000 to 3000
will be so fast, 1 gallon is not going to bring the water up more than 25C.. (20 is tap water temp here).

Note on Sound:
While filling the paintball bottle, I noticed a few changes in sound of the compressor.
The steady hum note, would shift a little and sound a little difference. (Pressure gauge not effected).
Once it seemed like the unit hiccuped.. That might have been the grid.
This afternoon I was testing during high usage lower voltage hours..

Note on gauge: It seems like mine doesn't have any oil either..
I have an oil filled gauge(2000psi), and it's got bubbles.. This YH pressure gauge is bubble free.. 
It works fine and doesn't vibrate into invisibility like the gauge on my tire compressor.. 

Edit: Last night, I noticed the gauge glows in the dark! So if you pop a breaker, wind up in a pitch dark room,
you can still locate the bleed knob, a few inches down from the glowing pressure dial.. (don't touch the hot parts)!
I stuck a flashlight on it, and it glowed really bright!
 
 
Cheers,
Rich
   

[Bizill]

Sounds like a winner there, Rich.

[avator]

Definitely a confidence builder.... thanks Rich.

[OleTomCat]

Good review Rich....

[2K1TJ]

Good to hear some feedback on these.

How much are you guys having to invest in filtering these units? I know filter units can get pricey...

[shultz]

I've got just over $100 in my high side filter. I can replace the media a dozen times, maybe more, with the amounts I bought...

$70 shipped for the filter housing(aliexpress)
$22 shipped for 3lb of 13x sieve(ebay)
$8 for activated carbon at Wal-Mart
$2 for a 2ft section of 1" SCH40 PVC at Lowes(any hard ware store will have this)
Couple O rings I already had in an O ring kit...

[gendoc]

For those that are still on the fence about buying a yong heng compressor, here is a link on eBay for under $300 shipped
http://m.ebay.com/itm/High-Pressure-30MPa-Compressor-System-Rifle-PCP-Electric-Air-110V-or-220V-/182665900863?_trkparms=aid%253D222007%2526algo%253DSIC.MBE%2526ao%253D1%2526asc%253D20150519202348%2526meid%253Dc01378f5c6bf4f8fb2aaef2ed388cc25%2526pid%253D100408%2526rk%253D1%2526rkt%253D25%2526sd%253D272644276527&_trksid=p2056116.c100408.m2460

Does anyone have this one?
I have sent the seller questions but have not yet replied.

In the description it states 120/220 50hz
Do any of you folks use this type for 120/240 60hz ?

As long as its compatible with 60hz, i can use it with either 120 or 240 volts.
Thanks for your information.

[Richard Lee]

Water Pump Problem:
Yesterday, I decided to remove the hose from the water pump. I had just started to remove the hose, when the plastic nipple just came right out.
It came out with just a slight tug. After inspecting everything closely, it looked like it was a press-fit. Not glued in place..
I decided to try some superglue. It's not coming out now..

So, if your YH compressor starts overheating badly, check the pump nipple, it may have popped out..

Cheers,
Rich

[Richard Lee]

Filter question:

I'm thinking about using a pre-filter inline with the air-input to my compressor.
A YouTube video, Google "Silica Gel under high vacuum.avi"
Seems to be saying that Silica Gel desiccant can be vacuumed dry for re-use..
I own a HVAC 50 micron vacuum pump, that might be useful to refurbish Silica Gel..

Would a Silica Gel filter be effective (to remove water) on the air-input to my Ebay compressor?   

Thanks,
Rich

 

[kzz1kaw]

Gendoc contact the seller to make sure you get a 120  volt

[shultz]

Richard,

I had thought of a drying intake air as well. I think, With as fast as these little pumps move air, to have enough drying volume/dwell time to do any good, you'll severely limit intake air and actually hinder air compression.

With this compressor, I think drying after the air is compressed is more important and useful than trying to dry air going in.

[Taso1000]

After giving this some thought I think putting a filter on the air intake may cause problems.  The compressor was designed to work at atmospheric pressure.  Anything you put on the intake will create a restriction and reduce atmospheric pressure and create more suction than normal.  This small increase in suction may draw oil into the compression chamber.

What you may be able to do is use a regular 100 psi home compressor.  You could feed the desiccant filter 100 psi air and then regulate it down to zero or .5 psi to feed the input of the hpa compressor.  A gauge reading of 14.7 psi means 14.7 psi over normal atmospheric pressure.  You can see this if you use the same gauge with nothing connected to it.  It should read zero.

So yes, I think it can be done.  Would there be much benefit?  I don't think so.  You may slightly reduce the amount of liquid water collected at the 1st and 2nd stage compressor bleeds.  But since you're regularly opening the bleeds there would be no significant benefit.  The remaining moisture going to your tank or gun will be in gas form.  That is why you need the molecular sieve on the output side of the hpa compressor.  Also the higher pressure the molecular sieve is under the more effective it is.

Thanks,

Taso

[gendoc]

Gendoc contact the seller to make sure you get a 120  volt

So i guess that would be a 60hz model.
Because there is not a 120 50hz voltage over there.
Thanks

[Buldawg76]

Water Pump Problem:
Yesterday, I decided to remove the hose from the water pump. I had just started to remove the hose, when the plastic nipple just came right out.
It came out with just a slight tug. After inspecting everything closely, it looked like it was a press-fit. Not glued in place..
I decided to try some superglue. It's not coming out now..

So, if your YH compressor starts overheating badly, check the pump nipple, it may have popped out..

Cheers,
Rich

Rich
Be aware that unless the super glue you used clearly states not water soluble it will be dissolved by the water its put into and allow the nipple to come loose. Medical super glues are not water soluble and I believe you can find non water soluble super glue at auto supply stores as well. Just thought I would let you know so you can keep an eye on it to see if it comes loose.

Mike

[Richard Lee]

Water Pump Problem:
Yesterday, I decided to remove the hose from the water pump. I had just started to remove the hose, when the plastic nipple just came right out.
It came out with just a slight tug. After inspecting everything closely, it looked like it was a press-fit. Not glued in place..
I decided to try some superglue. It's not coming out now..

So, if your YH compressor starts overheating badly, check the pump nipple, it may have popped out..

Cheers,
Rich

Rich
Be aware that unless the super glue you used clearly states not water soluble it will be dissolved by the water its put into and allow the nipple to come loose. Medical super glues are not water soluble and I believe you can find non water soluble super glue at auto supply stores as well. Just thought I would let you know so you can keep an eye on it to see if it comes loose.

Mike

Wow, I didn't know that about super glue. I used it at work, on items (experimental antenna parts) that were used in the rain,
and never had any problems. I suspect the 'government' super glue wasn't the same stuff we get at the dollar store..
Thanks for the info. I checked the package, and it's not recommended for water immersion.
I will let the pump soak for a while before using it this afternoon.
I have two screw-on cylinders for my FT rifle, that need to be topped off..

I noticed the water pump has a little lever, that swings to - & +  , if in the - position, there is no flow..

Thanks,
Rich
 

[Buldawg76]

Water Pump Problem:
Yesterday, I decided to remove the hose from the water pump. I had just started to remove the hose, when the plastic nipple just came right out.
It came out with just a slight tug. After inspecting everything closely, it looked like it was a press-fit. Not glued in place..
I decided to try some superglue. It's not coming out now..

So, if your YH compressor starts overheating badly, check the pump nipple, it may have popped out..

Cheers,
Rich

Rich
Be aware that unless the super glue you used clearly states not water soluble it will be dissolved by the water its put into and allow the nipple to come loose. Medical super glues are not water soluble and I believe you can find non water soluble super glue at auto supply stores as well. Just thought I would let you know so you can keep an eye on it to see if it comes loose.

Mike

Wow, I didn't know that about super glue. I used it at work, on items (experimental antenna parts) that were used in the rain,
and never had any problems. I suspect the 'government' super glue wasn't the same stuff we get at the dollar store..
Thanks for the info. I checked the package, and it's not recommended for water immersion.
I will let the pump soak for a while before using it this afternoon.
I have two screw-on cylinders for my FT rifle, that need to be topped off..

I noticed the water pump has a little lever, that swings to - & +  , if in the - position, there is no flow..

Thanks,
Rich

Its been my experience that it has to be immersed for several hours to dissolve the super glue so being subject to rain likely is not enough time or immersion in water to really dissolve the glue. I have some Mil Spec super glue that that I believe is non water soluble but have never tested it to be sure.

In my past as a GM technician when the Cadillac Alante first came out it had some bad weather strips around the convertible roof to windshield that would leak in heavy rain. Cadillac issued a service bulletin that had some small pieces of weather strip that had to be glued in place over the existing weather strips and the kit included some medical grade super glue that stated not water soluble. That's when I found out that the super glue from every day stores was not going to hold up in extended contact or immersed in  water. It also had a warning to not allow contact with skin since it would have to be cut loose to remove from the skin whereas with normal super glue you can soak in water to dissolve it from your skin.

Mike