Remove Air From CPU Block

[Andreas_Day]

I just finished a water cooled build but I have air stuck in the CPU block.

Has anyone got any tips/tricks to get the air out??

I can't just pick up the CPU block and move it around because I'm using hard/rigid tubing, so it cant be moved

 

[jaslion]

I just finished a water cooled build but I have air stuck in the CPU block.

Has anyone got any tips/tricks to get the air out??

I can't just pick up the CPU block and move it around because I'm using hard/rigid tubing, so it cant be moved

The best way it to shake you computer. Move it around a little whilst the loop is running to get the last bubbles out. Some will com out after a day or 2.

 

[Andreas_Day]

The best way it to shake you computer. Move it around a little whilst the loop is running to get the last bubbles out. Some will com out after a day or 2.

Thanks
I've tried shaking the crap out of the pc, they're not budging at all
I've tried picking the entire pc and trying to rotate it
I've also tried varying the pump speeds up and down.

I guess I'll just try shaking it again and turning it around unless anyone else has any ideas

 

[jaslion]

The best way it to shake you computer. Move it around a little whilst the loop is running to get the last bubbles out. Some will com out after a day or 2.

Thanks
I've tried shaking the crap out of the pc, they're not budging at all
I've tried picking the entire pc and trying to rotate it
I've also tried varying the pump speeds up and down.

I guess I'll just try shaking it again and turning it around unless anyone else has any ideas

Put it on it's side so that the cpu block is sitting horizontal compared to the ground. Then put the pump at full speed and just leave it be for a while.

 

[rubix_1011]

Those bubbles are normal and will work themselves out of the loop over the next few days of startups and shutdowns. They are the result of cavitation around the block and once the majority of air is worked out of the loop, you'll see less and less of this occurring. They are not going to make much of an impact for the time being. If they grow larger, you have an issue with air being pulled into the loop somewhere, either from your pump cycloning or a leak.

 

[Andreas_Day]

what coolant are you using? ??Do you have an open or closed loop? how do you fill it?

I have suspended my reservoir above the level of the cpu block; so the water pretty much siphons itself into that level without the pump being switched on.

Also the air bubbles could be indicitive of the pressure drop your system incurs; I know my cpu block is responsible for an 80% pressure drop; but since the res. is suspended above it I can get air bubbles out of the loop just by lifting the hoses up and dropping them a bit & the bubbles just flow out.

& I am using an open loop; my return feed just dribbles water back into the reservoir; as I haven't used any additives I could just suck on the return outlet and that would get rid of any stubborn bubbles without poisoning myself. I am also considering suspending my reservoir even higher so that the water drops 1.25m before hitting the cpu block. That would probably sort out my pressure drop problems. I could just use the pump to get the water back up since it has an hmax of 2m. and rely on the siphon effect to push the water through the loop.

what diameter tubing is that? ID/OD? If it's 8/10mm the bubbles are probably due to pressure drop.

Deionised water and Mayhems Pastel Dye.
My return feeds into the bottom of my pump/res combo.
I fill it from the top of the res.
My tubing is 13/10mm.
I cant just pick up the hoses and drop them as I'm using hard tubing

Those bubbles are normal and will work themselves out of the loop over the next few days of startups and shutdowns. They are the result of cavitation around the block and once the majority of air is worked out of the loop, you'll see less and less of this occurring. They are not going to make much of an impact for the time being. If they grow larger, you have an issue with air being pulled into the loop somewhere, either from your pump cycloning or a leak.

The bubbles are not getting smaller or larger, so I dont think I have a leak.
They have been there for almost two weeks now.

I managed to get most of them out by just shaking the hell out of the system and turning it upside down a few times. But the large bubble at the top just refuses to move.
You said they wont make an impact? So the bubble is not a problem? I assumed the trapped heated air would affect the cooling a bit

 

[FrankenDesign]

I would attach the filling hose to the res and blow; but you would need a lot of puff to cycle the loop awful much. how hard you have to puff will give you a sense of what pressure drop you get at the cpu block. I use 3/4 inch hose right up to the block; but it has 10mm couplers and that produces by itself an 80% pressure drop and I struggle to blow through the loop when I want to empty it. Contrasting with my radiator that has virtually no pressure drop; it is very easy to blow through

What does it mean? It means your pump needs to work harder to push the fluid through the loop; there are two ways it can be remedied, if it really bothers you. 1)a higher flow cpu block with wider apertures/flow channel 2)a more powerful pump with a higher operational psi.

That will get the water moving through and eliminate the air bubbles as it will reduce the pressure drop to some extent.

 

[Andreas_Day]

I would attach the filling hose to the res and blow; but you would need a lot of puff to cycle the loop awful much. how hard you have to puff will give you a sense of what pressure drop you get at the cpu block. I use 3/4 inch hose right up to the block; but it has 10mm couplers and that produces by itself an 80% pressure drop and I struggle to blow through the loop when I want to empty it. Contrasting with my radiator that has virtually no pressure drop; it is very easy to blow through

What does it mean? It means your pump needs to work harder to push the fluid through the loop; there are two ways it can be remedied, if it really bothers you. 1)a higher flow cpu block with wider apertures/flow channel 2)a more powerful pump with a higher operational psi.

That will get the water moving through and eliminate the air bubbles as it will reduce the pressure drop to some extent.

Ok that makes sense. Thanks a lot for the help.
But I've just finished the build, and I'm not going to change out the CPU block or my pump (especially since I have a pump res combo) just for one air bubble. I'll just keep shaking it and turning it and hopefully get the air bubble out.
This build will be wall mounted, so hopefully the air comes out before it goes up, as I wont be able to easily shake or turn it after that