I think that will work CD, as long as it can handle the current!!!

Thniking some more... I don't think the transformer idea will work, simply because you won't be able to find the part to convert 120VAC to say, 100VAC or even 60 VAC. It's out there, but it's not a very common part.

You've hinted that you intend to use that 900 gph pump at full power:
You've been warned:
Yet you are persistant (that part is good)

Dude...Get a life.

Seriously man, all that space crap. I dont care.

And Ya I guess Ill quote myself saying its industrial, but If industrial pumps are 45 then I guess it is. So who cares if its freakin industrial or not, its a strong ass pump.

And no I never indicated im using the pump at full power, How many times do I need to say it.



This thread it probally going to get banned, but I learned alot, Ive learned that its easier to just use a small pump, but kinda fun to phock around with big ones. And alot of other stuff I dont want to go into.

But your just a pain in the ass man, You succed at being very smart with your nasa crap that is not needed, just cause I said We went to the moon.

What are you trying to prove? That your probally smarter then EVERYONE here? or me? Which you most likely are when dealing with computers.

So stop posting in this thread, your ruining it trying to show off with your vast knowledge of nasa.

Care tho? Nope.

Why don't you look into Cal pumps. They have a few models that have an adjuster for the flow rate built into the pump itself.
You could just have a bypass tube flow back to a resevoir with a lever valve on it. That would allow you to vary it. The tubing up to and including the bypass could be 1" hose and at the bypass reduce down to 1/2" to continue your loop to the block and rad, this might keep your pump from overheating.

Hmm sounds like a great pump.

I was thinking the SAME thing with the bypass valve!

It would be some work going from 1'' to 1/2''

Maybe Ill try it out sometime.

You may have to reduce using two couplers but even that is an easy task.

Ya Ill have to hit up Home Cheapo, They have a crapy selection for plumbing

You know what? You should go ahead and get the big pump. In fact, why not try out a marine bilge pump? Whatever you do, just make sure to grease all of your hose couplings/barbs. Oh, and don't forget to remove any hose clamps you might have, as these will only restrict your flow rate.

:D :dome:

Help, the sarcasm is overflowing into... this... post. Now where's that waterpump to bail me out:D

I already did that.

(Thanks ECUPirate, you're my hero...)

Cieprus: I have tried to help you in your effort: I've suggested a diode circuit, and a transformer. I've confirmed that your oscillating fan controller was a good idea. I did however point out the difficulties that you are facing, but obviously you knew them too well.

Good Luck.

hehe.. do what you want man. just let us know what happens.

Well ECU.

Ive seen a 600 GPH @ 12.

Do you think thats ALOT better?

I guess I could downvolt it to 7v.

And have it pump at 350 GPH (Wrong number? Crapy math skillz :))

Im going to work on Using a dimmer on the 950 beast, Ill let you know how it works, and the pumps temps!

Here's a thought... I'd like some feedback.

Say you take a 900GPH pump and some how run it at say, 400GPH (w/ zero load/head), and you pit it against a true 400GPH pump. I'm willing to bet that that the true 400GPH will be able to generate more pressure/head, and it will do it more efficiently and last longer.
A 24v fan rated at 120 CFM running @ 12v won't perform as well as a 12v fan rated at 60CFM. It will be louder due to the pitch of the blades, and it most likely won't develop as much pressure because it is spinning about half as fast as it was designed to spin. Personally, I have three 24v fans. Two of them are Papst 120's, 4314 fans. I got them for less than $5 each, so that was justification enough for me. I also have a 24v PSU I'm trying to rig up, but that's another story. :)

Ive gotta work with what ive got man.

So if I downvolt that 600 GPH Marine pump...Do you thing it will have a problem?

I don't know man. I've never heard of anyone downvolting a pump... ever. But hey, maybe you can. If you already have the stuff, go for it. But don't buy a 600GPH pump so that you can downvolt it. I realize that perhaps you want the option of cranking up the flow rate, but I've never seen a WC setup that required that much flow, unless it involved a 6' bong cooler and 12 heatercores. :)

Guys, keep the talk polite. I see some people on both sides being funny but rude at the same time, and that is a dangerous line to walk. We want to keep the signal to noise ratio high, and the forums need to be friendly to everyone who is open to learning.

No flaming!

What kind of current does your pump draw? If it is less than 3A then you should be able to run it on a really inexpensive Variac (check ebay). For more powerful pumps the VariAcs get expensive. I am thinking about doing exactly the same thing to a 500GPH little GIant I have for testing purposes. This works more nicely than a ball valve because you aren't fumping a ton of heat into the water when you throttle it back. I am not sure a simple dimmer switch is going to be a good long term solution for your pump though...

I've down volted 12v pumps before (7v and 5 v), it won't hurt them, but won't stop them dying quickly either (re, DC pumps having around 3month life span)

I dunno about that man..

I own a 44cfm 60mm delta. at 7v it moves more air than my ys-tech 27cfm's and it is much quieter.

Are you saying all DC fans only live for about 3 months???

Or are you saying if I downvolt, THEN it will only last 3 months???

Cause im sure there are some people out ther with 12v pumps that have lasted a LONG time...

hmmm. well, I was referring to my 120mm fans... maybe it's different for little fans. remember when I was asking whether or not I should get a panaflo H1A and downvolt it or a L1A??? You guys said to get the L1A for various reasons.


12v pumps in general are not favorites amongst this forum. ;) I've not heard one good thing about them, nor have I heard of anyone downvolting them.

Gees you guys are so strickt.

Well I havent gone to Home Depot yet, so maybe they will have a lower GPH pump.

As for now, the lowest ive seen is the 600, Which is alot better then a 950

well damn, if you havent bought one yet, why not run down to Petsmart and grab a Danner Supreme Mag-Drive? it might be cheaper @ their website tho. look for water pumps under the fish heading.

Good Idea!!!!

Wow... There are alot.

Which one?

Supreme Mag Drive Pump Model 1 - 80 gph
$15.99

Supreme Mag Drive Pump Model 1.5 - 140 gph
$20.99

Supreme Mag Drive Pump Model 2 - 250 gph
$35.99

Supreme Mag Drive Pump Model 3 - 350 gph
$44.99 this one???

Supreme Mag Drive Pump Model 5 - 500 gph
$51.99

Supreme Mag Drive Pump Model 7 - 700 gph
$54.99

Supreme Mag Drive Pump Model 12 - 1200 gph
$99.99

If the DC pump relys on a seal on the drive shaft (direct coupling to the impeller) than it will have a limited life, either the seal will eventually fail flooding the internal workings, or the brushes will simply wear away. It's not going to be axactly 3 months, but that seems to be a rough average.(continous run time) down volting it will make it last a bit longer (less wear v time) exactly how much I wouldn't know.

note; I'm refering to brushed dc motor based pumps here, brushless fans and mag coupled pumps have a far greater MTBF.

wow. dude, you've gotta go for the 1200GPH. ...jk...

250 or 350 would be fine. It really depends on how many blocks you've got and how complicated your system is. The bigger the pump, the more vibration/noise/heat it will produce. If you've got a simple system without 90 degree bends and such, you could probably use 3/8" hose and a smallish pump and do just great. 3/8" hose would produce alot of backpressure if you try to cram alot of water through it. If you've got alot of shiet in your PC, run 1/2" ID hose w/ 5/8" OD barbs, and use the 350 pump. Bigger hose = less backpressure and so it can handle more GPH w/ less strain on the pump.
I've got about 12 feet of 5/8" & 1/2" hose in my setup, so my eheim 1250 (317GPH???) is really helpful. The flow rate is kindof pathetic with all that hose, but my temps are quite good.

Brad: sure, it moves more quietly. BUT it only moves air through whta, an Heatsink? how much resistance will that make? if you used is as a pump to move water, ill bet on that the YStech would be more efficient at 12v than the delta at 7v. but the i guess, those fans aint waterproof.

I'm sure they aren't waterproof :P

i agree with ecu, go for the 1200gph!