# 2 pumps together or seperate?

738 Views 13 Replies 7 Participants Last post by  Adeoliver
Ok Ive read up on some systems with 2 inline pumps and they all had the pumps connected to each other, seeings how Im about to hookup my second radiator I was curious if it would be fine to run the pumps seperately? I plan on running them on the same line just not right next to each other. There will be about 3 foot of tubing between them, I just wonder if this will cause any issues with the second pump, im sure it will work a bit more then the first pump but then again it will be pushing water back into the first pumpm, I just cant do the math right now so a second or third opinion would help me alot.

BTW this is on 2 Aqua Via 1300 pumps, which run 370gph @ 6'.
1 - 14 of 14 Posts
See this post in this thread.
1
Put the pumps in parallel, that will give you the highest flow rate.

Q = AV

Area (2 tubes join to one) goes in half, V (to keep Q constant) doubles.

But, you must consider loses in internal friction, ect. It called the law of diminishing returns.
Quote:
 See this post in this thread
Thanks.

Quote:
 Put the pumps in parallel, that will give you the highest flow rate. Q = AV Area (2 tubes join to one) goes in half, V (to keep Q constant) doubles. But, you must consider loses in internal friction, ect. It called the law of diminishing returns.
Flow rate isnt the problem but I just dont want it to become a problem, I just want to some what equalize the flow from the start to the end. Besides I dont have enough room in my external case to mount 2 pumps at the moment, and I dont plan on tearing the system ap[art agian till I get my other case built.
See less See more
1
Ive got both pumps and both rads up and running, I actualy get more consistant temps with 1 pump running then with 2 pumps, but Ive dropped my idle and load temps by 8c with 1 pump, I* get better flow with both running but my temps creep up 1-2c. I was having some kink issues last night so I got some new tubing today and re plumbed my system for the 5th time. Hopefully its all done now for awhile.
1
Quote:
 Originally Posted by Adeoliver Ive got both pumps and both rads up and running, I actualy get more consistant temps with 1 pump running then with 2 pumps, but Ive dropped my idle and load temps by 8c with 1 pump, I* get better flow with both running but my temps creep up 1-2c. I was having some kink issues last night so I got some new tubing today and re plumbed my system for the 5th time. Hopefully its all done now for awhile.

All done for a while--

Interesting report that 1 pump is better....
See less See more
Quote:
 Originally Posted by CyberDruid Interesting report that 1 pump is better....
I know its pretty strange, but I guess it makes sence as the coolant has more time to actualy cool the block before going through the cycle again. But even with 1 pump running Ive got a small tornado in my res, and with both running, it looks like a nice wave.
See less See more
Yeah mine is real 70's wave machine especially with the UV CCL on it...
If you run two pumps, don't run them next to each other. I would run them inline, but not next to eachother either. Hve one pump right after the radiator, then run all your tubes to your CPU and or GPU and other stuff. Then put the other pump between your heat blocks and the radiator. Running two pumps really does not help cool your PC much, it runs the fluid through the radiator too fast to cool itself. Liquid cooled motorcycles have a problem with fast pumps, you know what they do? They trim the fans in the impeller to make it pump slower. Just a thought.
Quote:
 Originally Posted by myComputerSucksMore() If you run two pumps, don't run them next to each other. I would run them inline, but not next to eachother either. Hve one pump right after the radiator, then run all your tubes to your CPU and or GPU and other stuff. Then put the other pump between your heat blocks and the radiator. Running two pumps really does not help cool your PC much, it runs the fluid through the radiator too fast to cool itself.

I agree to a point, I agree with the seperate inline configuration. As for the dual pump issue it all depends on your setup. In most case's dual pumps wont make a differance, but in my case I thought it might as Im running quite a bit of tubing and to large rads. As it turns out my 1 pump has plenty of power to push all the coolant, 2 pumps seems to be overkill but Im not going to seperate them now as I can run 1 for a few days then switch to the other for a few days. But when it comes to load temps 1 or 2 pumps run the same, no differance at all, or none that I have seen yet. All I can say is the system is easily cooling my system quite well with my CPU running a 137watt TDP.
See less See more
1
Quote:
 Originally Posted by Adeoliver But when it comes to load temps 1 or 2 pumps run the same, no differance at all, or none that I can see.
That seems to jibe with what I've seen in website reviews--once a minimum flow rate--say one to two gpm--additional flow seems to make little difference.

If anyone has data to the contrary, I'd enjoy seeing it--it's an interesting topic.
See less See more
I think it's worth a shot to run the pumps in parallel. There can be problems with running in series because the pumps are perfectly balanced and stuff. Running in parallel should increase pressure and GPM more. That's how I see it anyways. If you try it out let us know.
Quote:
 Originally Posted by DeathONator I think it's worth a shot to run the pumps in parallel. There can be problems with running in series because the pumps are perfectly balanced and stuff. Running in parallel should increase pressure and GPM more. That's how I see it anyways. If you try it out let us know.
Im pretty happy with how its working now, but I just got my other case in and when I get the time Ill probably redue the system and try them in parallel, although I dont need more pressure or flow, just 1 pump alone does the job. We will see what happens in the near future.
See less See more
1 - 14 of 14 Posts