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some flow questions and an issue

post #1 of 16
Thread Starter 
hey everyone i dont come here much but i always come when i have a problem smile.gif (love this site.) anyways. i was having a big issue with flow, the fluid was literally trickling out of the end of the loop into the res. so i put my 3 graphics cards in parallel instead of series and put in 2 y splitters to well... split the loop. i originally thought the flow restriction was the chipset but its not. its the cpu block. this is no low end cpu block. it was nice at the time i got it, its since discontinued. my loop currently goes like this.

res > pump > rad1 > rad2 > Ysplitter
Ysplitter(out1) > cpu > Ysplitter
Ysplitter(out2) > 3gpus > mosfet > n/s bridge > mosfet2 > Ysplitter
Ysplitter > res.

the flow thought the longer part of the loop is violent. in a good way. its strong and fast. but the cpu gets very little flow causing the temps to go up very high. so what i did as a teporary fix is take a hoseclamp and a small cut of tube (like 1/3in) and put the tube piece inside the hoseclamp and put this hackish device around one of the tubes at the end of the longer loop split. if i tighten it, it restricts the flow through the gpus, and forces more to the cpu, it adjusts the ratio of flow. this also make the out flow at the end of the loop less strong. far far better then the trickle i had before but not fast and violent like with no restriction.

does anyone have any recommendations? if you need any other part IDs or info on my system let me know.

Tube id. 1/2in
gpu gtx470 x3
cpu qx6700 @3.6ghz
ram 8gb ddr3 @1.8ghz
1200watt psu

THANKS OVERCLOCK.NET FORUMS! smile.gif
post #2 of 16
The problem is you're running everything in parallel, so blocks with more restriction get less flow, the entire flow rate is split between blocks proportionally. Since your 3 gpu blocks in parallel are very low restriction, this means almost NO flow is going to go to the cpu. You need to scrap your Y's and run your tubing something like this:

res > pump > rad1 > rad2 > cpu > [3 gpus in parallel] > mosfet > northbridge > mosfet > res
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post #3 of 16
erm... yeh... thats is one confusing loop lol

I can see why you are having flow issues, its all the y splitting, not good

Water being pushed round by a pump will always try and go for the easiest/less restricted path and with your setup this means the waters finding it easier to ignore you cpu

If it was my setup I would run a dual loop and stop with all the y splitting

Stick maybe the gpus on 1 loop and the rest on the other loop and have a single consistent flow through each loop
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post #4 of 16
Additionally, you don't list what pump you have... With all those blocks, the restriction may be too high for your pump. Depending on what pump you're using, you might consider adding a second pump in series. I personally avoid dual loops generally, as they just complicate the setup with no significant benefit, but really, at this point just about anything would be simpler than your existing setup.
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post #5 of 16
Quote:
Originally Posted by bakageta View Post

Additionally, you don't list what pump you have... With all those blocks, the restriction may be too high for your pump. Depending on what pump you're using, you might consider adding a second pump in series. I personally avoid dual loops generally, as they just complicate the setup with no significant benefit, but really, at this point just about anything would be simpler than your existing setup.

I disagree, I believe dual loops make things easier, easier if parts need to be changed or if the loop needs altering as you only need to take apart half your gear instead of everything but I suppose its all down to personal taste

But yes its true that it could be too much of a restriction for your pump, take into consideration in most cases a pump normally is in a loop consisting of 1 block and 1 rad, some bigger loops 2 - 3 blocks and 2 rads
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post #6 of 16
Thread Starter 
thanks for all of the responses. well first off. my loop before the y splitters was es > pump > rad1 > rad2 > cpu > [3 gpus in series] > mosfet > northbridge > mosfet > res. this is what caused the trickle.
i tried putting 2 pumps in series before. the mistake was putting it after my cpu block but it collapsed one of the tubes. i know for sure that the cpu block is the biggest restriction. and i also know my pump can handle it because minus the cpu block it runs like a monster. im worried if i put it back to how it was (only difference that gpus are in series now) it will be reduced to a trickle again :/ thoughts?
post #7 of 16
If that setup was reducing it to a trickle, you simply don't have enough pump power. Run a pair of pumps in series, have one feed into the other and you should be fine. Alternatively, replace the CPU block with something modern, like the XSPC Raystorm, for much lower restriction. Out of curiosity, what block IS it anyway?

(edit)
Just another thought... have you disassembled the cpu block to see if there's anything clogging it up? Depending on your tubing, it could have bits of plasticizer in it and have the restriction significantly increased.
Edited by bakageta - 1/31/12 at 8:36am
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post #8 of 16
Ysplitter in a loop suck lol. Water will always take the path of least resistance this will kill your temps some of the blocks in your loop
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post #9 of 16
Quote:
Originally Posted by bakageta View Post

If that setup was reducing it to a trickle, you simply don't have enough pump power. Run a pair of pumps in series, have one feed into the other and you should be fine. Alternatively, replace the CPU block with something modern, like the XSPC Raystorm, for much lower restriction. Out of curiosity, what block IS it anyway?
(edit)
Just another thought... have you disassembled the cpu block to see if there's anything clogging it up? Depending on your tubing, it could have bits of plasticizer in it and have the restriction significantly increased.

Agree, sounds like your block may be blocked, have a check inside or like suggested consider getting a raystorm
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post #10 of 16
Thread Starter 
ill try to look it up for you as soon as i can find the model number. its not up on the site i got it anymore :/ ... ill try dissembling it later if i get a chance. getting a new block is a last resort but i guess it may be my only option... its my last resort because it means draining the entire system and taking out the mobo... which sucks. but if its what i gotta do its what i gotta do. and as for the pump power. as i said earlier. minus the cpu block the system flows very well. ill try to see if its clogged at some point... plus i have no room for a second pump. it wold get in the way of airflow. i tried it before.
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