Flow resistance question MCP655

[beau]

So how many components is too many for the Swiftech MCP655 Variable speed pump.

I've got:

2 GFX waterblocks

1 Mobo VRM waterblock

1 Southbridge waterblock

2 radiators

1 resivoir

 

What I've noticed is my flow rate has reduced to a rather slow pace and it has me wondering if I have flow resistance issues. (yes pump is on max speed).

Granted my pump is pushing water upwards through all the components, fighting gravity, but this pump should be strong enough to tug a tug-boat.

 

So if it is a flow resistance issue, is the easiest solution to this just getting another pump?

How would the second pump connect into the loop?  Do I need a 2nd resivoir, or an entirely separate loop?

 

Final question.  What impacts flow resistance more?  Excessive tubing lengths or more components?

[Leonard]

So how many components is too many for the Swiftech MCP655 Variable speed pump.

I've got:

2 GFX waterblocks

1 Mobo VRM waterblock

1 Southbridge waterblock

2 radiators

1 resivoir

 

What I've noticed is my flow rate has reduced to a rather slow pace and it has me wondering if I have flow resistance issues. (yes pump is on max speed).

Granted my pump is pushing water upwards through all the components, fighting gravity, but this pump should be strong enough to tug a tug-boat.

 

So if it is a flow resistance issue, is the easiest solution to this just getting another pump?

How would the second pump connect into the loop?  Do I need a 2nd resivoir, or an entirely separate loop?

 

Final question.  What impacts flow resistance more?  Excessive tubing lengths or more components?

That pump can handle all of that with no problem. If you have any quick disconnects in the loop, well that is where the restriction will come from. Too many can cause a serious restriction.

[gatecrasherlok]

That pump can handle all of that with no problem. If you have any quick disconnects in the loop, well that is where the restriction will come from. Too many can cause a serious restriction.

 The newer koolance quick disconnects QD3 surprisingly not as retrictive as many make it out to be. I have four within my loop. My aquaero before quoted 106/lph circulated without the quickdisconnects. With four in place it reads as 104/lph circulated. A drop yes, but not significant enough to make much of a difference in the grand scheme of water cooling.

[beau]

 The newer koolance quick disconnects QD3 surprisingly not as retrictive as many make it out to be. I have four within my loop. My aquaero before quoted 106/lph circulated without the quickdisconnects. With four in place it reads as 104/lph circulated. A drop yes, but not significant enough to make much of a difference in the grand scheme of water cooling.

Well I don't have any quick disconnects, though I have two 45 degree fittings and 2 90 degree fittings but I would imagine these would have negligible effect on the resistance.

I've used about 6-7 feet of 3/8" 5/8" tubing so that no doubt may have an effect.

Though my pump is rated at 1200 L/h but its more like ~100 L/h just now doing my leak test.

[gatecrasherlok]

You should be fine with the pump, many swear by it and so do I so rest assured. Angled fittings, quick disconnects etc all will cause some negative effects at the end of the day but not enough to warrant losing any sleep over it. Anyways good luck with leak testing bud.

[Leonard]

 The newer koolance quick disconnects QD3 surprisingly not as retrictive as many make it out to be. I have four within my loop. My aquaero before quoted 106/lph circulated without the quickdisconnects. With four in place it reads as 104/lph circulated. A drop yes, but not significant enough to make much of a difference in the grand scheme of water cooling.

That is very restrictive when compared to the pump's flow of like 1200lph.

[gatecrasherlok]

That is very restrictive when compared to the pump's flow of like 1200lph.

 Yes your right but every angle a 90/45 degree down to how many blocks all the way to the channel layout of the rad will increase restrictiveness. The pump will run at 1200lph on setting 5 (12V) most likely, mine runs at speed one. I'll turn my pump up tomorrow to 5 for a day and see what results I'll be able to muster. Currently at speed one it's pushing 1800 revs/min, and at speed 5 it should push 4800 revs/min.

[Leonard]

 Yes your right but every angle a 90/45 degree down to how many blocks all the way to the channel layout of the rad will increase restrictiveness. The pump will run at 1200lph on setting 5 (12V) most likely, mine runs at speed one. I'll turn my pump up tomorrow to 5 for a day and see what results I'll be able to muster. Currently at speed one it's pushing 1800 revs/min, and at speed 5 it should push 4800 revs/min.

No angled fitting restricts like a quick disconnect. I have tried them and it is too restrictive for me. I wish they were better though. 

[gatecrasherlok]

No angled fitting restricts like a quick disconnect. I have tried them and it is too restrictive for me. I wish they were better though. 

 

Yeah I've heard many people complain about them before but for me they seem to work okay, I expected some restrictivness from the get go anyway but in all honesty it does not seem to have as big of an impact in my loop as first thoughts. May I ask which ones you have tried beforehand, I might get a set and try it out and see how much difference there is as my 9 month maintenance is coming up soon. 

[Leonard]

Yeah I've heard many people complain about them before but for me they seem to work okay, I expected some restrictivness from the get go anyway but in all honesty it does not seem to have as big of an impact in my loop as first thoughts. May I ask which ones you have tried beforehand, I might get a set and try it out and see how much difference there is as my 9 month maintenance is coming up soon. 

You change your parts every 9 months or just clean and add new parts?

 

I used this and the female for it...http://www.frozencpu.com/products/17966/ex-tub-1636/Bitspower_Matte_Black_Quick-Disconnected_Male_w_Inner_G14_BP-MBQDMIG14.html#blank

 

Don't get me wrong, they do work well not a single drop is spilled when disconnected but my temperatures rose buy 5C when i installed it. I believe it was a combination of the quick disconnect and my pump(it being crappy X20 v4).

[gatecrasherlok]

I wish i had the money to change parts every nine months but my wallet would break unfortunately. I pretty much clean the blocks, redo tubing and flush the radiators through a filter. Those bitspower QDC's look nice but I have never tried them before, I've only tried the Koolance models. I'll see if I can try a pair in UK and see how they perform. It's interesting though to find out these things.

[Prophet of Entropy]

how restrictive you loop is mostly comes down to the single largest restriction in your loop.  and that is most likely your CPU block.  adding extra stuff and longer will lower flow further but by much much less.

 

anything over 1.5 liters a min is plenty of flow, you might want higher if you run 4-5 heat sources. (MBs, mosfets and ram don't count as heat sources)

 

as for gravity and flow, it really isn't an issue unless your pumping fluid from one holding tank to another and not in a sealed loop.  (since gravity works equally both going up AND down)

 

they make dual/triple/quad pump mounts so that's all you'd need.