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Weird problem with CPU loop!

post #1 of 91
8/23/12 at 9:33am
Thread Starter 
Hello Friends and fellow water coolers!

I am having a frustrating issue with my CPU loop.

The loop consists of the following:

Tubing: 1/2ID 3/4 OD

Radiator: MagicCool Monsta Limited Extreem Radiator 360/420

Reservoir: FrozenQ PC Mods 250mm Liquid Fusion V Series "2nd Generation" Reservoir - UV Cathode - UV Green Helix


CPU Block: Kyros Kuplex HF Silver .925

Pumps: 2x D5 MCP655 pumps with Bitspower D5 Dual Mod Top

(Please do not ask why i am using this beast of a rad and pumps to cool just my CPU)
(I love overkill)


Loop Construction:

Reservoir to Pump Inlet - Pump Outlet to Radiator - Radiator to Cpu Block - Cpu Block to Reservoir.

Anyway,

Here is the problem:

I fill up the reservoir with water all the way to the top right?

When i run the pumps, the water receeds like normal but stops about half way down the reservoir. When i stop the Pumps, the water shoots back up and fills the reservoir to the top again. It seems like there is something stuck in the loop or a bottleneck of some kind that is causing the water to shoot back up to the top of the reservoir like that.

I tried to fill the reservoir to the top while the pumps were running to fill in the huge gap in the reservoir but this caused alot of pressure which is not right.

Anyway, what would you guys recommend i do?
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BigDaddy Subject Delta
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post #2 of 91
8/23/12 at 9:37am
  • Ganf
  • Overclocker in Training
Fittings. Need to know how many and what type of fittings you are using.
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post #3 of 91
8/23/12 at 9:42am
Quote:
I tried to fill the reservoir to the top while the pumps were running to fill in the huge gap in the reservoir but this caused alot of pressure which is not right.

This doesn't make sense to me: what do you mean by pressure? If you have the cap open to fill it, there can't be a pressure build-up in the res.
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post #4 of 91
8/23/12 at 10:01am
  • Ganf
  • Overclocker in Training
The pump is maintaining pressure in the system while he has the cap off. The reason the pump is producing so much pressure in the system is because he's got some severe restriction somewhere. That's why I asked for a list of the fittings, because it's either that or one of the components of his loop.
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post #5 of 91
8/23/12 at 10:09am
Thread Starter 
Quote:
Originally Posted by Ganf View Post

Fittings. Need to know how many and what type of fittings you are using.


Sorry!

Fittings:

All bitspower 1/2ID 3/4OD Rotary Compression

Reservoir Inlet: 1 90 Deg angle Rotary Compression

Reservoir Outlet: 1 Rotary Compression fitting

Pump inlet: 1 45 Deg angle Rotary Compression

Pump Outlet: 1 90 Deg rotary compression

Radiator Inelt: 45 Deg Rotary Compression

Radiator Outlet: 90 Deg Rotary Compression

Cpu Inlet: 90 Deg Rotary Compression

Cpu Outlet 90 Deg Rotary Compression
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post #6 of 91
8/23/12 at 10:11am
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

This doesn't make sense to me: what do you mean by pressure? If you have the cap open to fill it, there can't be a pressure build-up in the res.

Yes it does create pressure once i stop the pumps. You see, when the pumps stop the Water shoots back up to the top. With the extra water i put in the reservoir, the pressure increases when i stop the pumps
BigDaddy Subject Delta
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BigDaddy Subject Delta
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post #7 of 91
8/23/12 at 10:22am
Quote:
Originally Posted by jblanc03 View Post

Yes it does create pressure once i stop the pumps. You see, when the pumps stop the Water shoots back up to the top. With the extra water i put in the reservoir, the pressure increases when i stop the pumps
So while your pump is running there is no water coming back into the reservoir or just a trickle? Can you draw a diagram of your loop so we can see how much gravity has a part in this?
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post #8 of 91
8/23/12 at 11:31am
Thread Starter 
Quote:
Originally Posted by Electrocutor View Post

So while your pump is running there is no water coming back into the reservoir or just a trickle? Can you draw a diagram of your loop so we can see how much gravity has a part in this?



Please excuse my crappy drawing.

This is basically exactly how it is connected.

I have the Magic Cool Monsta rad on its side on a Bracket that attatches to the Extended Pedestal underneath my case
BigDaddy Subject Delta
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BigDaddy Subject Delta
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Intel SSD 510 Hitachi Hard Drive Kyros Cuplex HF.925 Silver  Win 7 Ultimate 64 Bit 
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post #9 of 91
8/23/12 at 11:36am
Quote:
Originally Posted by jblanc03 View Post


Please excuse my crappy drawing.
This is basically exactly how it is connected.
I have the Magic Cool Monsta rad on its side on a Bracket that attatches to the Extended Pedestal underneath my case

I would guess that due to your res being lower than your cpu block you still have some air in the line from the res to cpu, or even in the cpu block when the pump is off. When the pump is on this air is forced out by the water and goes to the only place it can, the top of the res. That is if the output on the res is indeed on the bottom. So when the loop is off gravity plays its part and the water recedes back into the res. Sort of like a tidal effect??
Edited by Rickles - 8/23/12 at 11:43am
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post #10 of 91
8/23/12 at 11:47am
Something is off: if both the inlet and outlet for the loop are at the same level in the bottom of the res, there is no way it should come flooding back in unless your loop is plugged by something and you're compressing a lot of air inside the loop.

Is your tubing clear so you can see where the water is and is not moving?


[Edit]
In the bottom and out the top of a side-mounted radiator is correct and should bleed the air by default. Having the pump push the water from bottom to top should also bleed by default. If that drawing is accurate, you have to have something inside that is plugging the air.
Edited by Electrocutor - 8/23/12 at 11:51am
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