Question on cheap pump on Amazon. 12V 15A

[mdz2766]

http://www.amazon.com/Jabsco-31700-0...ag=dealnewscom

Can I use this pump for water cooling in a PC case?

[mdz2766]

I just saw it sold out, but it was going for $21 down from 200.

[Vapor]

While 4.3GPM max is nice....the two ratings of 50PSI max and 15A concern me

That's like seven MCP35X's in serial...would need reinforced tubing and really strong clamps (and even then, the waterblocks themselves might not be able to handle >30PSI [which would be the pressure for the first component or two in the loop]).

On top of that, surely the heatdump from a 180W pump (not all of it goes into the water as heat, some to the air, probably 10-20% to moving the water) would almost definitely outweigh whatever flow benefits there are.

Then there's issues with powering it, cooling it (is it meant to be submerged?), and the noise it makes. I'd avoid it for WCing, even if it were free.

[mdz2766]

what about running this under powered, like with only 7A. It's air cooled and not submerged.

I'm thinking this could be used under powered for an external rad box.

[Vapor]

How do you plan on limiting current?

If it's via downvolting, then you'd need a separate, adjustable power supply (not inexpensive). And no guarantee it will run outside of 12V +/- 10%.

[Waterlogged]

Pressure washer pumps are far from quiet. It's not the actual motor making the noise but rather the pump. It's PD style pump and I've never heard a quiet one, no matter how slow it turns...If it were possible, you could take that pump down to 4V and it would still likely be louder than anything the hobby already has.

Cheap is nice but, these aren't worth your money or your time.

[NaeKuh]

all hail the new man pump..

my Rd-30 looks even tiny compared to this guy.

[mdz2766]

How do you plan on limiting current?

If it's via downvolting, then you'd need a separate, adjustable power supply (not inexpensive). And no guarantee it will run outside of 12V +/- 10%.

I have lots of spare laptop/external hd adapters that are 12v and range from 1A to 6A

PAR-Max 4 Electric Diaphragm Pump w/ 12 Volt DC Motor (12VDC). Continuous rated Washdown / livewell Pump. Saltwater or freshwater use. Ports : 3/4" ID hose. c/w

It'll need an adapter for 1/2 ID tubing

[m0r7if3r]

You can't under-current it. It will draw a set current at a given voltage or it will blow up the supply.

[Vapor]

You can't under-current it. It will draw a set current at a given voltage or it will blow up the supply.

+1

[defect9]

if you were to relate electronics to say, a water pipe, voltage would be the diameter of pipe, and amperage would be pressure/psi. wattage (voltage x amperage) would be flow.

think of required current of an electronic device as not pressure, but vacuum, when in relation to the wall socket. electronics 'pull' a certain amount of juice (wattage), at a certain vacuum (amperage) through a certain size hole (voltage) off the main supply (the wall). anything in between the electronics and the wall that can't handle that sort of suction basically collapses, like when you take a straw, plug one end, and suck on it. as was said, your supply will fail. possibly catastrophically.

another example would be that of a supercharger. your electronic device being the supercharger. if you have too much blockage between the outside air and the charger, or your intake pipe is too small/restrictive and not built to flow the amount the supercharger is asking for, it will collapse (or at a minimum eat your filter). (note that in automotive applications this is actually very rare as nobody uses a garden hose for their intake, but the analogy still sorta stands. it's hard to find a good 'pressure' or amperage-related analogy).

[Alexandr0s]

all hail the new man pump..

my Rd-30 looks even tiny compared to this guy.

Now he just needs a Windy Computer, and that image you posted earlier would truely apply . He'd also have my utmost respect if he managed to fit that pump with a watercooling system into a midtower !

[bmaverick]

Cheap pump needed or a less expensive one needed? That is the question.

Cheap can mean two entirely different things.