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Water pump loosing flow/head pressure

post #1 of 14
Thread Starter 
I have had the same problem with 3 different pumps. I have a decent size loop with a 250ml res. I'm cooling my ram, cpu, and 2 gpu's as well. The problem is that when I turn my rig on, the water seems to flow just fine for about a minute or 30 sec. But then the flow seems to drop off dramatically to just a trickle. I mean the water is still moving but it just slows to a crawl. I have tried using 3 different pumps with the same result. A 655 pump, 355 pump, and an all in one pump/res which I believe is a 655 as well. I know my psu is adequate because I'm using a 1200w Corsair AX. My watts never go above 800 for the total system draw. I even took my main psu out and installed another Corsair AX 1200 and still got the same results. I thought there may be an obstruction but if there was one, wouldn't it be blocked even from the first time I started my system. At first start, the flow is strong and normal. Nevertheless, I took the loop apart to check for any obstructions but I could find none. Do I just need to get another pump for a dual pump setup to keep the flow strong? The system is in a Switch 810 and I am using Primochill's rigid tubing for most of my loop with some crystal links on my ram and cpu blocks. I have quite a few bends in the loop but no more than are necessary for the loop to do it's job. Any advice would be appreciated on how to fix this. Thanks!
post #2 of 14
What are your temperatures like?

What are you using to measure Flowrate?
Black Noise
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Black Noise
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post #3 of 14
Yeah. This is odd.
I too am curious as to what you are using to measure flow rate.
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post #4 of 14
Thread Starter 
Well, I don't have a flow meter installed but I can see how slow it gets by looking at the fluid as it passes back into the reservoir. I'm totally stumped by this since the loop seems to be free of any obstructions at all.
post #5 of 14
Thread Starter 
Quote:
Originally Posted by Big Elf View Post

What are your temperatures like?

What are you using to measure Flowrate?
Also, my temps are normal to low. No problem there at all even with the fluid moving at a crawl. I also thought that maybe it was a wiring problem so I rewired some of my cables and made them neater then tried out the loop with the back panel off in case i was inadvertently causing something to be partially disconnected with the panel on but I still get the same results.
post #6 of 14
What brand rad do you have? My bet is there's a chunk of loose solder or something in your radiators and when you turn it on, it rattles around until it finally gets caught on the thread or maybe a couple chunks that clog the channels. Then when you turn it off they just bottom out since there's no pressure, then when you turn it back on it rattle around till it clogs again.
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post #7 of 14
I think what's faulty is your perception of the flow rate.
I think everything is probably just fine.
But I would get a Koolance flow meter and adapter for piece of nind.
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Dark Vader
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post #8 of 14
Here is one thing you can do right now.
When restriction is added, the pump's rpm will usually drop.
So if you have an rpm signal on your pump, hook it up to your fan controller or one of your fan headers on your mobo.
If the pump rpm slows down at the same time your perceive a lower flow rate, that is most likely something restricting your loop intermittently, as ZytheEKS suggested.
At least, it will rule out that possibility.
Dark Vader
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Dark Vader
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by ZytheEKS View Post

What brand rad do you have? My bet is there's a chunk of loose solder or something in your radiators and when you turn it on, it rattles around until it finally gets caught on the thread or maybe a couple chunks that clog the channels. Then when you turn it off they just bottom out since there's no pressure, then when you turn it back on it rattle around till it clogs again.
The radiators are Black Ice and I have 2 of them. A 360 and a 240. I took them out of the loop and flushed and examined them already. No obstructions could be detected by me.
post #10 of 14
Thread Starter 
Quote:
Originally Posted by PepeLapiu View Post

I think what's faulty is your perception of the flow rate.
I think everything is probably just fine.
But I would get a Koolance flow meter and adapter for piece of nind.
I highly doubt that my perception is off. I can see the fluid at the start of my system flowing strong. About 30 seconds later, I see the flow rate decline as the fluid enters my reservoir. It trickles to a crawl.
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