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Guys something doesnt add up with my loop

post #1 of 16
Thread Starter 
i fee like the pumps are working half speed ? with one off i see more water flow am i doing something wrong here ?


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post #2 of 16
Based on my analysis, a couple of things:

First you need a microres or reservoir. At worst you create one. Let me know if you wanna do this and I can point you in the right direction. The reason is you need something to bleed the air out of the loop.

Second for what you are doing and not knowing what type of radiator you have, you only need one pump. If you radiator is big or tough to push water through, then you use two pumps. Give details on your radiator so that I can give you a firm answer on using one pump.

Third, this is a personal choice; I recommend putting the radiator after the pumps and before the cpu. What this does is maximize the delta (temperature) of the heat being cool at it's possible lowest temp for this setup.

Post some pics so we can see what you are doin'.
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post #3 of 16
I'm not sure why you would set your loop up like that, but to answer your question, if one pump is pumping a little harder than the other, or has a little less restriction from fittings/tubing on the inlet and/or outlet, more water will flow through it.

It is unlikely your parallel pump setup in a CPU only loop is yielding any better CPU temps than you would get with just one of the pumps.
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post #4 of 16
Thread Starter 
the Rad is the XSPC RX 360
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post #5 of 16
Yes you only need one pump and get a reservoir or use one of your Y fittings to create a T line so that you can effectively bleed you system of air.
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post #6 of 16
Thread Starter 
i just wanted to push more water through the system thats why i went this way. But some how there is a vacuum effect going on
Edited by joe2004 - 4/7/11 at 8:27pm
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post #7 of 16
It's one thing to push water through the system fast, but it's another to push it through so fast that you lose out of effectively cooling it. You may be creating too much turbulence. Water temp will reach equilibrium at some point.
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post #8 of 16
In order to increase the flowrate you need to put those pumps in series. Parallel like that is only as effective as a single pump, you just have the added reliability.

Definitely need a res or T-line to get the loop fully bled, and I'd turn the rad the other way (barbs at the top) to allow it to bleed easily. Then connect P1out to P2in and you'll be all set.
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post #9 of 16
What others have said, in order for you to get the most pressure, you need the pumps in series. Your flow rate after your cpu is not much so you aren't getting that much pressure into the pumps. Also, you need to put your CPU block after your pumps, then it goes to the radiator to cool down and back to the reservoir and pumps. it should be PUMP --> CPU block --> radiator --> reservoir --> and back to pump.
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post #10 of 16
I'm used to pumps that are orders of magnitude larger than what is found in PC cooling, but I'm pretty sure that the same principles apply.

In a nutshell:
Parallel pumps will up to double the flow when there is little restriction, but won't work against much higher head pressure than a single pump.
The increase in flow, over a single pump, rapidly declines as head pressure is increased.

Series pumps give you up to double the head pressure to work with, but not that great of an increase in flow in a non restrictive system.
An increase in flow from series pumps over a single pump would only really be seen in a system with a lot of restriction/lift.

Your typical PC water cooling loop would fall into the "restrictive" side of things, so you would be better off with pumps in series, but even then it would only be needed if one pump by itself was not able to maintain >1 gph.
There are only minimal gains to be had beyond that point.

At least that is how I see it from my dumb HVAC guy point of view.
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