Yong heng scba fill times

Ever thought about using antifreeze in the water to keep it running cool

Cool, Sounds like it's cranking away.

I'm in the process of returning a Vevor compressor and would like a do-over. If I had it to do again I would have bought the YH.

Antifreeze will make it run hotter; Plain water is a much better heat conductor. There is a product called "Water Wetter" that is commonly used in race car radiators, which can help marginally. I was thinking about trying some.

Your fill times are much better than mine: It takes almost 5 minutes, just to pressurize my fill line & water separator to 3,000 psi; it takes an hour to top off my 45 min-SCBA bottle from 3,000 to 4,000 psi. Still better than a hand pump tho. 

Steeve, I also believe you have a leak some where in your system. Mine runs 3x faster than your numbers. Get some leak detector spray and check your lines, I've seen those foam up like a rabid dog.

"Water wetter" has a horrible stench. One tiny drop of dish detergent in a 5 gallon bucket of water will act as a surfactant and pull more heat from the pump.

So will jet dry liquid , also doesn't foam... 

The tiny drop of dish detergent is the cheapest and doesn't foam at all. I just filled a 74 ft³ SCBA from 800psi to 4500 using 2 one gallon blocks of ice. It was my first run on an alpha filter from E-HPA. It worked great in the high humidity here. I stopped 3 times to drain water and only got water from the drain the first time. Soaked 3 Chinese tampons though.

I leak tested everything with soapy water many times. Even stopped the compressor and shut off the tank to see if the gauge would bleed down....no leaks. I think mine must have leaky internal valves or poor piston ring seals. (Total time on the compressor is under 3 hours). my first Yong Heng worked flawless, but it got melted in my house fire. The new one has had problems from day one. I had the crank case cover off to check the bottom end because it sounded like it was trying to seize up...nothing wrong tho...just a lot of dirt/filings left in there from the manufacturer. the problem turned out to be with the Regulator/auto shut-off system, so I removed it all and wired the motor direct. now I have to watch the fill pressure and shut it off manually. This seems to be a common problem with these pumps, So I recommend anyone wanting to buy one of these, to get the cheaper version, without the auto shut-off or red light/warning buzzer and keep an eye on the gauge while filling or you will be replacing the safety burst-discs that will pop between 4,500 and 5,000 psi. Also, consensus is building, that the factory recommended #46 hydraulic oil is not very good in these compressors and a high performance synthetic compressor oil is better for the bearing surfaces and stays cleaner longer. I am switching to the "Royal Purple" brand of synthetic compressor oil ASAP. Finally, I would add that my unit runs very hot, even with a couple gallons of ice in the water; about 60 65 degrees C. Maybe because of the hot ambient temp here (inland San Diego county) So I have to run the pump after Midnight, when the air gets down in the 80s(F). PITA!

The detergent in the cooling water will help break up the surface tension, but don't know if it will aid much in cooling ability....can't hurt.