Vevor (YH Clone)

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PelletJunkie

PelletJunkie

Member
Sep 25, 2022
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Dallas, TX, USA
There was a thread posted a while ago about a deal for a Vevor (Yong Heng Clone) for ~$105. I ended up purchasing it and I finally had some time to test it out today. I tightened everything first, filled it with Mobil 827 Rarus to the top of the red dot and I then plumbed the upgraded flow rate pump that one of the members recommended on this forum. I turned on the water pump opened the bleed screws/ports and I let the compressor run under no load for 15 minutes while watching the temp which never went over 55°. I then quick-connected my Taipan fill probe, closed the valves and began to fill the rifle.

As I was filling it I noticed a difference in the pressure reading from my Taipan Vet gauge and the Vevor pressure gauge. Is it normal or uncommon for these Vevor/YH gauges to be off? I read that some folks pull the gauge and screw a plug into the housing. Is there another brand gauge that would work as a replacement?

The other thing that I found strange, in addition to the accuracy of the gauge, was the reading/red warning indication that starts at 20 MPA (3000 PSI). From what I have read folks are filling SCBA/Scuba tanks to 4500 PSI which leads me to believe that even though the needle is in the red it is still okay (safe) to fill tanks to 4000-4500 PSI, correct?

20221110_185053.jpg


Also after only running the compressor for 20 minutes total (15 min no load break-in) I noticed the oil is already discolored. The strange thing is when I filled it the oil was only to the top of the red dot and after running it today it looks like it is higher than the original fill point. Is it time for me to do my first oil change?:

20221110_142851.jpg


I appreciate any feedback as I am trying to figure out this whole PCP thing.

-PJ
 
My uneducated guess is that there’s some factory coatings that may be cycling through initially or something somewhere is going over temp. It’s hard to believe that they are putting a product out at that price that is of quality. Why, to eat into YH’s enormously profitable business? Doubtful. Don’t get me wrong, there are some decent items that are well priced out there (AVA) but a $100 high pressure compressor? Not too likely. If so, congratulations.
 
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Can't comment on the gauge, mine not even visible with set-up, I just go by gun gauge. Think members plug gauge holes or replace YH gauges due to breakage, rather than inaccuracy. My initial oil change was at one hour, oil was dirty, too. Only do annual changes now. On my Yong Heng, oil level should intersect red circle, I make sure it does prior to each start. If my room temp compressor oil level was high like yours, I'd drain some out to intersect red circle, prior to next start. Vevor might be different, follow manual instructions. WM
 
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Gr8Recreation said:
My uneducated guess is that there’s some factory coatings that may be cycling through initially or something somewhere is going over temp. It’s hard to believe that they are putting a product out at that price that is of quality. Why, to eat into YH’s enormously profitable business? Doubtful. Don’t get me wrong, there are some decent items that are well priced out there (AVA) but a $100 high pressure compressor? Not too likely. If so, congratulations.
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Gr8Recreation

Agreed, but I literally had my Rover Mini go out the night before it was posted and I saw the thread on the Vevor and I figured $100, let it ride...... I needed something in the interim to fill my PCP(s) while I could research a better/permanent compressor solution. At minimum it will be a learning experience and I have seen where people have rebuilt the Vevor with the original Yong Heng top end/piston assemblies so I'll see how long it lasts.

I just want to clarify based on your other comment, do you agree that based on the discoloration of the oil I should go ahead and change it?

-PJ
 
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IMHO you should get a PROPER gauge that doesn't go into the red at 3,000psi (assuming your compressor is rated to 4500psi). Oil discoloration is normal. I was worried about the same thing as my oil darkened after 2nd run after oil change. Next time I'm changing to Seco Lube. I've used Royal Purple or Husky Synthetic so far & they both discolored. Hasn't affected function though. The gauges are NOT expensive, precision equipment so no surprise to get different readings. They give you a close approximation. Personally, I WOULD NOT remove gauge & replace with a plug, but with a proper gauge in the interest of safety!
 
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Mo-Ron said:
After a first good run the oil may of washed out the factory / assembly, first break-in , residues (from there oils to any metal flakes ,ect..). Personly id change it just to get out that first run contamination.

But thats just me on stuff..
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Mo-Ron

Just as cheap insurance I'm going to change the oil. I have crazy/tragic luck so better safe than sorry.


-PJ
 
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I have that compressor, I also bought one at that low price but haven't opened it yet. I've only used SecoLube and the initial discoloration is normal in all oils.
I changed my first oil after 30 minutes, not because I had to but knowing these aren't top of the line compressors I go out of my way to baby it.

Without a legit calibration check there's no way to know which one of our gauges is the 'true' psi. I'm fairly sure my gun guage reads 100 psi high, but I wouldn't guarantee it.
I constantly use 6 different gauges, 2 on each of my external bottles, 1 on my gun bottle and 1 on the compressor so who knows for sure which one is 100% accurate.
Larger gauges will stand a chance of being more accurate due to their size. Seeing 4300 on a small gauge might be 4150 on a larger gauge.

I decided to stay with the compressor gauge as my go to psi. I always stop filling at 4450 on it, that way regardless of what the other bottles show I'll have a constant psi to use.
The red area is only there as a 'eye catcher', maybe it's a scuba tank guage which most are rated for 3k. My gun bottle is 3K, so your gauge would be an indicator for those 3K bottles, it's the numbers that are important to watch.

There's always a fudge factor in tanks for psi. 3K is usually ok even at 3200 psi but since I don't know for sure the accuracy of my gun gauge I don't push it to that even though I have in the past.

The higher oil level is fine, the important thing is to be sure you keep a bubble showing at the top of the sight glass, it makes it easier to see any change in the oil level.
Next time you can fill slightly less and get a bigger bubble up top, you can always add more oil if needed.
 
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willy said:
Man "ifen ya want it to last DONT" go over 3000psi that really puts the Hert on them" also never never shut it down under pursuer" always bled it down. Turning it off under purser can actually break the journal off the end of the crankshaft"
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Makes sense.. pre start and pre shutdown procedure.
 
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