Yong Heng, Radiator vs Ice, my results so far (Video added)
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Once the water reaches maximum pumping height and falls back down the siphon effect cancels out the head pressure so a larger pump isn't necessary.
Even though the oem pump can't lift water more than a few feet, if you lift the bucket to let it get through the compressor head just once it will be plenty of water flow even if the bucket were 20 feet below the compressor.
A tiny drop of dish soap will make you happier than water wetter because the latter is expensive and really smells bad.
If you run clear tubing on a closed loops system, add a few drops of copper sulfate solution to prevent algae growth.
Edit: I just wanted to add that I'm only sharing knowledge and experience. I don't mean to offend in any way.
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The suggestion that moving the water faster does not improve heat transfer from the YH is untrue. The rate of heat transfer is a function of the temperature difference between the higher temperature source and the lower temperature destination for the thermal energy. If you slow down the water flow, it spends more time close to the source of the thermal energy so it gets hotter reducing the rate of thermal transfer. Conversely if you speed up the flow, the water stays cooler because it is not close to the heat source for as long. The rate of heat transfer from the water at a radiator or into the bucket of water is increased by the water getting hotter but it does not fully offset the added thermal load from the smaller flow. The water will go up in temperature fast at first and then the rate of increase will slow or even stop. That is due to these effects. As the water temperature increases it picks up less heat but discharges more in the radiator. That slows the rate of increase. If you continue to think faster flow does not reduce the maximum temperature it would be easy to test. I am confident you will find that a bigger pump - more flow - will reduce the temperature. There are limits, of course, if the water flows too fast you can impede heat transfer because of turbulence at the water to metal interface. But within reason, more flow = lower temperature.
I thought of a common situation that may help convince somebody of the effect of flow. My convertible has an electric water pump. It doesn't have a temperature gauge but I run software on my phone and tablet called "torque" that lets me monitor all the data on the OBDII port. I've monitored engine coolant temperature and I can clearly see when the coolant pump is running at maximum speed. It's a BMW and they let the coolant heat up pretty high if you are just cruising along. But if you get on the engine, it drops the coolant temperature. The heat input is increased as you accelerate but that is more than offset by higher coolant flow.
I thought of a common situation that may help convince somebody of the effect of flow. My convertible has an electric water pump. It doesn't have a temperature gauge but I run software on my phone and tablet called "torque" that lets me monitor all the data on the OBDII port. I've monitored engine coolant temperature and I can clearly see when the coolant pump is running at maximum speed. It's a BMW and they let the coolant heat up pretty high if you are just cruising along. But if you get on the engine, it drops the coolant temperature. The heat input is increased as you accelerate but that is more than offset by higher coolant flow.
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When was the last time you cleaned the air filters, or replaced the tampons? Also, I noticed you have several several filters inline. The more filters you have for the air to pass through the harder the compressor will have to work. Each filter creates resistance and back pressure. This will cause it to run hotter. I also noticed in the picture of your setup that you are using some copper lines that are smaller in diameter than the main silicone tubes. This will restrict you flow and as a result less fluid per unit of time will come in contact with the surface area that needs to be cooled. Cooling is proportional to to heat transfer rate and cross sectional area of the tubing and the area the Cooling fluid passes through. Also, run 50/50 distilled water to aluminum safe coolant. The coolant has lubricants that help with the conducive heat transfer. Your setup should not be running at 70C. At most 57C. If all that is taken care of and you are still running hot, your problem is with the compressor itself. Just my two cents worth...
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We are both saying the same thing differently. I agree with you thoughts. Hopefully someone will listen...
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The bolded part is incorrect. Pure DW actually removes heat better than a 50/50 antifreeze mix. The only reason for the antifreeze is to 1) Keep the water from freezing, and 2) To add anti-corrosive properties to protect the aluminum.
In fact, a 90/10 or 80/20 mix of DW/AF would cool better, but of course wouldn't protect to as low of a temp as the 50/50 mix would.
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I hear what you are saying and I agree about the water by itself. However, there are disadvantages of only using water.
To clarify I use the Prestone 50/50 ready mix. Fill half the bucket with this 50/50 antifreeze/coolant and the other half with Distilled water. So, in reality it is somewhere in the range of 75/25 antifreeze/coolant to Distilled water. I used distilled water for six months and then opened the cooling jacket to clean it and I did not like what the DI water did in there, thus my choice to add antifreeze/coolant in the water. This mixture has other additives that increase cooling and protection to the metals (corrosion, buildup, pitting, scaling, rust). I have not had any problems ever since and have been using the same fluid for the last 3 years. It is clean, it keeps things clean, and does the job without question. I use this fluid mix for my Tuxing double cylinder and Yong Heng. Just my thoughts and my first hand encounter.
With that said, it works for me. We all do what we believe is right for our situation.
Click the link below for:
Presotone Antifreze/Coolant mixture
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Correct. DW alone is bad for aluminum. And it freezes. But AF reduces cooling. So it's all about trading off. Personally, I use Water Wetter instead of AF, because I can use a LOT less and get the same corrosion protection, but I also don't have to worry about freezing.
The truth of the matter is, as cool as my CS4 runs (and most of our compressors on here do), we could likely run 100% AF and be just fine. Probably wouldn't change the temp by more than a degree or two. We don't have to worry about boiling nor hot spots within our coolant systems.
My point about AF is that it doesn't cool better than water alone. But it's necessary to use it or WW to reduce corrosion as well as algae in our systems. I don't have the desire to do so, but maybe one day someone will run pure AF in their coolant system and report back as to the cooling performance and what the system looks like in a year or two (probably sparkling clean would be my guess).
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I don't think the cooling on mine has a small coolant passage like in your drawing, mine has a water jacket like this one in the pictures. I took these screenshots from a video on YouTube. Here's a link to the full video:
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That makes more sense. A single passage would not cool the head evenly and wouldn't be worth while.
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My thought would be a drop or two of Jet Dry in the cooling water. Makes water wetter. Darn little of it in the water to affect anything else. I will try it.
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I use a five gallon pail and pre-cool the water with reusable Freeze Packs and then add some fresh one along the way. I can fill my 66 cf SCBA tank from 2800 to 4500 without going above 122F. If the temperature does reach 122F before I have finished the fill I either call it good enough or let the YH cool for an hour or so. I use distilled water with Water Wetter and Seco 500 oil. So far, so good.
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I found that for me, lots of air flowing on the head and tubes makes a big difference in heat saturation. I’ve moved up to a large compressor, but this crazy setup worked well while I used it. 
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I have a couple of those fans from when I used to grow...tomatoes.
So I should try that, however, as @3Crows mentioned, I currently pre-chill my water for about 30 min-1 hour with a frozen bottle, then I pre-chill the compressor on really hot summer days a hair, from say 31c down to 24c, then I let it rip. At 15~ minutes run time I am usually at 49c which is where I terminate that filling session.
-Matt
So I should try that, however, as @3Crows mentioned, I currently pre-chill my water for about 30 min-1 hour with a frozen bottle, then I pre-chill the compressor on really hot summer days a hair, from say 31c down to 24c, then I let it rip. At 15~ minutes run time I am usually at 49c which is where I terminate that filling session.
-Matt
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All you guys running these super coolers? What color is your clear or purple oil at the end of the week? I just pulled my top end to check. Valves, water jacket all very clean using Distilled and water wetter. None of that white corrosion as is Cotton's old video. Me? Going on 4.5 years with this pump and try to never go over 60C...
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Anyone see that set-up on boob tube showing YH running 1 hour 15 minutes to fill large bottle? Used about 6 or so computer fan coolers with temps ending about 81C? Nothing said about oil or red glow from motor...
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I would never let my YH get to 81 C and I cannot imagine needing to run it for 1 hour and 15 minutes to fill a large bottle. My 45 minute bottle is 66 cubic feet if I remember right. It refills from 3000 or so to 300 bar in less than half an hour. Are there bottles over twice as big?
I use water wetter partially so I do not have to keep changing my water so things don't start growing in it. I've used the same water for a couple years at this point. But I think it helps heat transfer too.
I also use a 8 inch fan I got off Amazon to blow across the motor. I think it helps.
But I think the biggest change is to add a computer radiator. I don't know if a bigger radiator like a heater core for a car would work better but I doubt it would. The passages are larger for bigger flow. Putting little YH lines on a heater core will result in very low flow through the radiator. I don't think that helps cooling. The computer radiators are not very expensive ($20-30) and have passages about right for the YH. My drywall bucket is modified so I can leave it closed and run the YH. The power for the pump and the hose connections go through the lid. I think that also helps me avoid water changes. My drywall bucket is only about half full. The temperature of my YH will rise to around 50 C in 5 minutes. But it will stay under 60 c for at least 25 minutes.
I am currently wondering if the optimum YH setup might be to put something like my 8 inch fan on the motor blowing towards the compressor and put the radiator on the other side of the compressor so the fan on the motor helps the fans on the radiator get a lot of air past the radiator. I'm not sure how much the water volume matters. It might work well with just the water in the lines and radiator and the loop. No tank. I think I'm only using about 2 gallons and that amount is working fine. I might need two computer radiators to completely avoid ice. And stay under 60 C. If I skip the ice in hot weather my temperature only goes up to about 62C.
I use water wetter partially so I do not have to keep changing my water so things don't start growing in it. I've used the same water for a couple years at this point. But I think it helps heat transfer too.
I also use a 8 inch fan I got off Amazon to blow across the motor. I think it helps.
But I think the biggest change is to add a computer radiator. I don't know if a bigger radiator like a heater core for a car would work better but I doubt it would. The passages are larger for bigger flow. Putting little YH lines on a heater core will result in very low flow through the radiator. I don't think that helps cooling. The computer radiators are not very expensive ($20-30) and have passages about right for the YH. My drywall bucket is modified so I can leave it closed and run the YH. The power for the pump and the hose connections go through the lid. I think that also helps me avoid water changes. My drywall bucket is only about half full. The temperature of my YH will rise to around 50 C in 5 minutes. But it will stay under 60 c for at least 25 minutes.
I am currently wondering if the optimum YH setup might be to put something like my 8 inch fan on the motor blowing towards the compressor and put the radiator on the other side of the compressor so the fan on the motor helps the fans on the radiator get a lot of air past the radiator. I'm not sure how much the water volume matters. It might work well with just the water in the lines and radiator and the loop. No tank. I think I'm only using about 2 gallons and that amount is working fine. I might need two computer radiators to completely avoid ice. And stay under 60 C. If I skip the ice in hot weather my temperature only goes up to about 62C.
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It takes a full 15 minutes for my YH to get to 49.9c, and I have never exceeded 50.9c....this is with stock water pump, stock everything.
The only thing I do is pre-chill the bucket of water for 30min-1 hr.
Strange yours is so heavily modded yet running so hot. I think the optimum setup for me is basically how it comes from the factory with very chilled water prior to turning it on, and if its 30c+ outside, letting the water run through the yh to drop the cylinder head temp to ~24c.
-Matt
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