Comparing Chinese compressors

[jonny75904]

ok so i already know the argument of you get what you pay for etc. But, i have found two cheapo pumps, and I am wondering if anyone has experience with either.

one is on ebay, it is unbranded and from China.
https://m.ebay.com/itm/30MPA-4500PSI-300ba-High-Pressure-Air-Compressor-PCP-Airgun-Scuba-Air-Pump-USA/222689395260?hash=item33d952823c%3Ag%3AYkAAAOSwsM1Z3cvp&_trkparms=pageci%253A5b04c90b-b928-11e7-87bc-74dbd1805c20%257Cparentrq%253A5142f4e315f0ab6af7166d46fffdd5d2%257Ciid%253A2


The other is a Yong Heng compressor on Amazon.

https://www.amazon.com/gp/aw/d/B074DV92RF/ref=pd_aw_sim_sbs_469_1?ie=UTF8&psc=1&refRID=MGADAXZES0ZW11MN3DVT&dpPl=1&dpID=51O4T8ZqDnL

Due to their low cost - $300 - the unbranded china pump clearly is appealing. Problem is, ebay is a crap shoot. At least at Amazon, products retain their reviews.

So, question one, what kind of experiences have you had with these pumps? Question two, do these have to piggyback off another compressor? I know some shoebox compressors need a first stage to bring the pressure up.

MOD EDIT: moved to air tanks and compressors section

 

[Saltlake58]

whole bunch of discussions on these in the Air Tanks and Compressors section

http://www.airgunnation.com/topic/aceeaglepcpmart-compressor-do-not-buy-this/
http://www.airgunnation.com/topic/walmart-com-has-the-young-heng-compressors-in-stock/
http://www.airgunnation.com/topic/yong-heng-trouble/

Probably the most informative of the threads 'cause it's the oldest is:
http://www.airgunnation.com/topic/did-i-make-a-big-mistake-i-bought-a-yong-heng-compressor-from-china/

Teardown at the end of this video

Experiences vary, opinions vary, not a clear yes or no in my book.

 

[Alan]

The biggest issue I see with these cheap compressors isn't the lack of a built-in cooling system. Rather it is the poor quality piston rings. When they wear enough over time (usually a short time), a small amount of oil creeps into the high pressure side. Any amount oil, no matter how small, can cause a catastrophic explosion. Personally, I choose to live a while longer!

 

[jonny75904]

excellent links. I think i will get the YH - it seems to be the one everyone is using. At least then if i have problems it is likely others have had the same problem.

One other question, besides the compressor itself, what else do I need? I was reading where someone said you have to have a bucket and water for the cooling?

My (in the mail) Armada has a male foster fitting, so i need a hose that has a foster female quick disconnect on it that attaches?

 

[azccj]

"Alan"The biggest issue I see with these cheap compressors isn't the lack of a built-in cooling system. Rather it is the poor quality piston rings. When they wear enough over time (usually a short time), a small amount of oil creeps into the high pressure side. Any amount oil, no matter how small, can cause a catastrophic explosion. Personally, I choose to live a while longer!

This is another myth when it comes to HP compressors. On my Coltri compressor there is a hose that goes from the oil fill tube to the intake manifold of the first stage cylinder. When the compressor is running I can watch as a small amount of oil, from what is being splattered around in the crankcase, flows through the clear hose to the intake manifold. You can guess where the oil goes once it enters the manifold.....into the first stage cylinder, then into the other 3 stage cylinders at ever increasing pressure and heat. When I purge the fluid from the water separator, which is located after the 4th stage, it isn't just water that comes out, it's a mix of mostly water with oil mixed in. Yet somehow my compressor and air tank don't erupt in a catastrophic explosion. Now it may be that the special oil used in the compressor is non-flammable but the bottom line is the compressor, at least the one I use, was designed to feed oil into the cylinders and the oil, at least this type, doesn't explode at least in conditions up to 4700 psi that the compressor is capable of making.

 

 

[jonny75904]

 does this compressor come with everything I need to directly connect it to my gun? Or do I have to buy a separate female foster quick connect hose?

 

[jonny75904]

ok yes it does come with a foster quick connect. supposedly - just says it comes ready for an air gun.

 

[Regal_US]

The one thing you absolutely need (if you care about the life of your tanks and guns) is a high pressure molecular sieve filter on the outlet to trap all the water and oil that's being output by your pump. You will need to purchase this as a separate component (e.g. from Joe Brancato). Unfortunately, this only comes as a standard part with more expensive compressors like the Bauer & the Coltri mentioned in a prior post; these typically have 2 cascaded stages of moisture traps on the high pressure outlet, where most of the water condenses, followed by the molecular sieve filter. Without those, your filter cartridge is going to have a shorter lifetime. Lots of prior posts on this topic on the forum.

 

[AGFAN]

I'm a little suspect of all the new Chinese compressors that use petroleum oil. I wonder if they have an adequate oil filter. The Shoebox Compressor Manual says **Use only Silicone Oil! ** Other oils can explode and kill you. I've heard over and over that petroleum products should never be introduced to your HPA because degraded petroleum has a much lower ignition temperature and can explode under high pressure. You could try to filter all the oil out but if what I've heard is true why would you want to introduce it to your HPA supply in the first place?

 

[ohio_hunter]

the dreaded explosion can be avoided if you install air breather.alot of guys are blasting these units as man killers.they are not.if properly set up they will fill your rifles fast.the explosions that have been recorded have been user not installing air breather.the higher priced compressors are hurting in sales because of these and some of the higher cost retailers are really blasting these units as man killers because they hurting sales.i do not have a high priced compressor and I wonder if they have crankcase breathers?if they do and it is not installed I think there could be a chance of the dreaded explosion with them also...