Whys my water pump hissing?

Gerard

Gerard

Gerard

Caporegime
Joined
18 Oct 2002
Posts
41,296
Location
Ireland
Installed my laing 18w pump today adn the rest of the stuff for my first internal watercooled system. For whatever reason though the pump is emitting a hissing sound as the fluid goes through it. A very noticable hissing noise at that, tried tightning up the pump fitings and so far no joy, just sits there making this annoying sound =/

Any ideas as to what it could be?
 
sounds like air in the pump to me... try turning it off and back on a few times, ddcs normally quieten off over time too.
 
Tried quite a few times and still no luck, bit of froth still in the res so maybe thats attributing to it.
 
make sure its not touching the case anywhere and other than that just wait.. time should sort it out.

turn it off overnight, that often helps too.. just make sure it starts when you turn it on, they have a habit of sticking and just need a knock to get them going.
 
Well the way i have it set up is its stuck to the case with velcro pads. Case is an antec p182 and its sitting in the upper removable hard drive bay.

Not sure about the heat issue with these though, using 7/16th tubing on 1/2 barbs i find it pretty akward to get it sitting somewhere unless something is attaching it to the case.
 
The DDC pumps have two small holes on the base of them. Obscure these it will burn em out! They are what it uses to breath check they are not obscured as soon as you can. Also a top that is overtightened can cause the problem you describe.
 
pazza316 said:
The DDC pumps have two small holes on the base of them. Obscure these it will burn em out! They are what it uses to breath check they are not obscured as soon as you can. Also a top that is overtightened can cause the problem you describe.
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first time I've heard about breathing holes? They supply them with foam pads that stick to the entire base??
 
check your barbs are not overtightened, should just be tightened enough to seal, not squash.

sounds like air getting in or out. any moisture around it?
 
Checked all the connections nothing on too tight, holes are unobscured. Dunno wtf is causing this but its very annoying, almost like sitting next to a frying pan the noise its making.

Suppose i might have to get a new one =/, 10watt instead of 18 maybe. ON the subject of watercooling ive noticed a small kink on the hose going into the res, if i add coils to straighten it out would i have to drain the loop? Suppose ill probably have to anywya if i get a new pump.
 
Hey Gerard,

Will just say that i got it a little with my 10w DDC but only for a short while and now it's silent.

Do you have a seperate res or does it have a res/top as the turbulence in the res/top could be causing bubbles and consequently the noise?

gt
 
The res is a drive bay res, does have some bubbles in it but im assuming theres bound to be some regardless with the water being pumped in and out.

Also what fans do people reccomend and what orientation? Im using 2 yate loons at the minute and getting about 69c load at 3.6 (1.45 vcore q6600 g0). Both are set to blow into the rad, seen other people saying using sharkoons in a pull config is better. rad is a thermochill pa120.2
 
I know this goes against lots of people on the forums who I respect enormously, but I definitely think the 18W DDC is too much for most loops. The water moves so fast through the reservoir that it takes ages to settle down. I almost always recommend the 10W DDC or the the DC5-Vario instead.

My first choice for a suspect would be the bay reservoir as they are notorious for allowing air back into the system. I also been told that having your pump high in the loop is also a bad idea as it means air could stick there, plus there is this thing about pumping against mavity, but that's always seemed a litle counter-intuitive to me.

Try running the pump at 5V for a short period until all the bubbles are out, then turn it back up again.
 
WJA96 said:
I also been told that having your pump high in the loop is also a bad idea as it means air could stick there,
Click to expand...

From an engineering standpoint if the pump is at the high point in the system air will migrate and 'stick' in the pump causing cavitation and the nosie described, this will also wear the pump out very fast.

WJA96 said:
plus there is this thing about pumping against mavity, but that's always seemed a litle counter-intuitive to me.
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Pumps have a 'pump head' which is the maximum height they can pump water vertically against mavity, this varies from pump to pump but I would hazzard a guess that as these pumps are designed to be used in pc systems that they're pump head is at least 600-800mm (max case height).
 
Your fans should be on the outside of the rad blowing in, so if you rad is at the top, they should be on top blowing down, if bottom, then bottom (blowing up)

If you have foamm, you have air - this will cause you hissing, even if it's just a small bubble in the pump.

i have an 18w DDC with pexilglass top, is noisless. I believe they have about a 15ft head!
 
Well heres things as they are currently


testing.jpg


How exactly do i lower the pump voltage? :confused:
 
Gerard said:
How exactly do i lower the pump voltage? :confused:
Click to expand...

Swap the red and yellow wires over on the 4-pin connector. The red wire carries 12V, the yellow 5V, so if you swap them over, you get a 5V pump. Google "5V mod".
 
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