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Problem: too much restriction? Radiator crunching when turning off pumps?

post #1 of 41
Thread Starter 
Since end of november, I finished reassambling my loop with new blocks.

In my loop I currently have.

-Reservoir
-Dual MCP 655 Pumps with EK Dual Top
-Feser 240 Radiator
-Dual EK FC-6970 GPU Blocks in Parallel
-Feser 480 Radiator
-Feser 360 Radiator
-Heatkiller 3.0 LT
-EK- Rampage III Extreme Block
(-Back to reservoir)

In november, I removed my triple 5xxx series GPU (waterblocks) and replace them with Dual 6970 Blocks. Since then everytime I close my computer, when the pumps shut down, it seems like there is pressure building in my top Radiator and its doing a crunching sound, I experience no leak though (yet) But I hear I have Bnegative pressure in my loop because I have to much restriction.

I didnt have that problem during my old setup with another GPU blocks. (Or didn't notice it. But I found 3 Bitspower rotaries with leaks ????)

CLUE: With my old GPU blocks, I wanted to clean the loop and mixed vinegar and distilled water and I ran the loop for 20 minutes.... BAD THING, I had the EK Bad nickel plated blocks, the water turned blue and the blocks lost their nickel. But after draining my loop (with the old setup). I experienced no problem. It only started when I changed for the 6970 blocks.

What solutions can I try. Heard the pressure valve was a solution, and its not expensive. Do you think something is gunked up in my loop? Like the CPU, I can see inside the mobo block and their is no gunk stuff. GPU blocks are new... Pumps are clean??

I tried opening the Res after the pumps were shut off and the water level always raise, if I close the reservoir and turn on the pumps again, the pumps are sucking air and dont run properly. And as soon as I open the reservoir while the pump runs, the water level is decreasing and the pumps start to run fine after. If I close again the reservoir and then turn off the pumps, the water level in the reservoir doesn't move but my Radiator seems like crunching, like wanting to explode.

Please Help

Thanks
Edited by KaRLiToS - 1/10/12 at 8:04pm
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post #2 of 41
Yikes, It certainly sounds like there is too much pressure in the loop due to a restriction:o. The dual 655's should be more than enough to to move your fluid, but they are struggling.

My 2cents.gif Either you have bits of chrome from the old blocks blocking flow somewhere you can't see (rad maybe) or, less likely, if you are running your blocks in serial try running them in parallel, as that should be much less restrictive.

Maybe post some pics and let a fresh set of eyes see if anything is amiss in your setup?
post #3 of 41
You cant have too much pressure, even in a closed loop with no res. I bet something else is wrong. If you have a res, drain some water so that there its not 100% full and see if the sound goes away. I bet its air.
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post #4 of 41
If your reservoir is filling with fluid when you shut off the pump, the only thing that can replace that water is air. Air bubbles getting forced through the tiny copper tubes of a radiator does not sound good, but doesn't hurt anything either. You need to figure out why the rad is draining when the loop is off. How is your reservoir setup? Does the inlet sit below the water line?
 
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post #5 of 41
He has a res and its sounds like its not totally full. What do you make of this?

(from op)

"I tried opening the Res after the pumps were shut off and the water level always raise, if I close the reservoir and turn on the pumps again, the pumps are sucking air and dont run properly. And as soon as I open the reservoir while the pump runs, the water level is decreasing and the pumps start to run fine after. If I close again the reservoir and then turn off the pumps, the water level in the reservoir doesn't move but my Radiator seems like crunching, like wanting to explode."

Thats what made it sound like a blockage to me but I've never heard of this particular problem before redface.gif

EDIT: Looks like he's using an XSPC bay res, if that makes any difference.
Edited by gelatin_factory - 1/10/12 at 8:27pm
post #6 of 41
Quote:
Originally Posted by gelatin_factory View Post

Thats what made it sound like a blockage to me but I've never heard of this particular problem before redface.gif

The EK nickel problems did not produce bits of nickel large enough to really be visible. Those that were, were still tiny. Also look at the thickness of nickel plating, being fractions of a millimeter. If a piece did in fact "flake off", it is so thin that it would not have enough mass to clang on the copper pipes. Depending on the flow of the loop, it would also not make it through the CPU or GPU blocks. It's only about as thick as cheap copy paper.
 
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post #7 of 41
You have air in your loop. The "crunching" sound you hear in the radiator is the sound of air bubbles and water moving around as the water seeks its lowest level.

With the system off, and just the pumps running, rock your case around, even to the point of tilting it all the way to the front and to the back and side to side.

It would also help if you can run the pump with the radiator disconnected from the case so you can rock it around to work the air out of it.
Top mounted radiators can be devilish to get the air out of.
Quote:
And as soon as I open the reservoir while the pump runs, the water level is decreasing and the pumps start to run fine after.

This is the point where you add water to keep the level up while gently banging on the radiator. wink.gif
Edited by Caleal - 1/11/12 at 12:02am
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post #8 of 41
Yep you definitely have trapped air in your loop, the only thing you did or didn't do properly this time is bleed all of the air out of your loop! When bleeding your loop rotate your case in a circular motion (on floor) at a 45 degree angle, do this several times and shake the case will go a long way to ridding you of trapped air.
post #9 of 41
Thread Starter 
This is a picture of my current build, just to show you my components in it.

I will change my bay reservoir to a Tube reservoir just beside my dual pump top.

450
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post #10 of 41
Thread Starter 
I tried to shake it, turn it upside down, nothing works, I'll try harder tonight after work.

Do you think a pressure valve could help?
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WaterCool MoRA3 Pro with Gentle Typhoon 3 x MCP 655 pumps (With EK top...all serial) 2 x EK FC 1080ti Blocks Windows 7 Ultimate x64 
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WaterCool MoRA3 Pro with Gentle Typhoon 3 x MCP 655 pumps (With EK top...all serial) 2 x EK FC 1080ti Blocks Windows 7 Ultimate x64 
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