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pump capacity / electrical interference Answered

I am building a custom watercooling system in a confined space, with the pump motor close to the processor.

for the pump, I intend to use a thin centrifugal pump with a centeral brushless motor based around a re-wound cd drive stator, but don't know what the power required to move enough water is, especially with small bore pipe (2 X 1/4"

also, when positioning the pump, how far away should it be from the main board to avoid causing interference, as the pump is essentially a large spinning magnet with several amps going to it.

I'm guessing the motor should be as far away as possible, as well as the supply cables.

thanks for the help.


.  Unless your motor/pump is grossly over-sized, your (overclocked?) CPU will probably make more EM noise. Radiation drops off quickly with distance (inverse square), so moving the motor just a little bit will be a big help.
.  I'm with caitlinsdad - put the pump outside the case and EM interference won't be a concern.

the pump has to go inside, but there is a fair bit of distance between the processor and where the pump is going, so it should be allright, especially once the whole assembly is grounded, seeing as the fan motor is fairly close to the processor allready, and causes no problems.

also, what is the flow rate/pressure needed to work properly (the processor has a relatively low heat output at the moment, so i'm guessing it doesn't need to be too high.

thanks for the advice so far.

. It's the flow that counts; set the pressure as low as possible. As far as flow goes, experiment.

Grounding the case (true earth ground) of the motor might help some too.

Are you trying to repipe the dishwasher or washing machine motor next to your cpu to watercool it? Those are motors with several amps going through it. Usually the pump it mounted outside the case for cooling and leak protection and the tubing routed to your heatsink. Your cooling block should be a big shield for your cpu though.