Iwaki MD-20RZ DC
 

A friend of mine is a distributor for Iwaki pumps here in AZ. I was talking with him about the possiblity of getting the 20rz in a dc motor, but one would have to order 200 pumps to be able to get one.

If someone were to place this large order (i.e. me), would there be enough interest in a 12v or 24v version of this pump? I don't know any bulk pricing at this point, but I think it might be a decent business venture (due to the wide release of the Storm G4) if there was enough demand.

Let me know what you guys think. :)

what are the specs of the 12v model (does it exist?)

Any general idea on pricing? Would the specs of the 12v DC 20RZ be similar to the 120v AC?

ok his original post said he had no clue on priceing so asking him how much is fkin redundant. The specs i would gather would be close to the AC version .....

How about an RD-30 in 12vdc? If they have to be purchased in lots of 200 I bet the price would be around $150.

I'd also assume that the specs are inline with the 120v version as the impeller would be the same and an appropriate DC motor would be selected by Iwaki so that it achieves the same RPM as the AC version. This seems like the most efficient means of modifying the pump for the manufacturer. Price is anyone's guess. I'd be interested for $150. Pair one of those with a Swiftech Storm and a decent rad..... gosh that makes my setup seem obsolete :)

He said he doesn't know BULK prices. I figured he'd have a general idea of the range. I thought he might have been able to say something as vague as "somewhere within $30 of X" [ie: 100-130 or 170-200]. He has to have some sort of a general idea of price if he thinks he can make it a profitable business venture. No?

As for specs, you know what they say about asumeing, you make an ass out of you.

LOL! Nice one BRit. You just messed it up. When you ASSUME you make an ASS out of U and ME.

I would say that a RD-20 is perhaps a better choice than the RD-30.

The RD-30 is nice, but it is somewhat over-powered and hot (has too large of a heat dump) for anything short of a tri-fan radiator to deal with.

The RD-20 is a much better balanced pump as far as water-cooling use is concerned.

I have the 24v RD-30 here, and I get my best temps with the RD30 when it is run at 17-19v, rather than at its full 24v, and I have a 24x30cm radiator cooling the water (although with two quiet fans).

Internally the RD-20 is indentical to the RD-30, and the RD-20 @ 24v runs pretty much like an RD-30 @ 20v.

So again, the RD-20 is the better balanced pump to be targetting here, and not the RD-30.

If the pump is the same internally (impeller, intake, outlet, etc.) than we are only talking different motors and different RPM ranges here. Correct? If this is the case than we don't really need to talk about a specific model but instead a model range (e.g. RD20/30) and then specify what we need in terms of flow and head. From there we can derive what sort of a RPM range the DC motor will need.

Do you guys think this is the correct way to go about it? Anybody willing to tear apart one of their own pumps, try to install a DC motor, and see how it works? A sacraficial lamb to the watercooling community if you will :p

Cathar, in this case maybe an RD-20 24vdc could be rewound to run off of 12vdc with the same output. Thus allowing it to run off of a good PSU?

What about the Panworld PI 20? Supposedly slightly better specs than RD20, same heat dump, just as hard to get and the size of an MCP600.

pricerange has just come in: between $5 and $400 US dollars + $5-$3000 for shipping on EACH dc pump :)

This would be a good venture I think as the Storm type blocks are selling very well for Cathar & now will be made by Swiftech which should increase volume a good deal.

Look forward to reading more on this.

That's A Big Range :eek:

well, i'd be interested. actually, right now, I'm interested in most powerful DC pumps (like the RDs, PI-Z-Ds)

Yes, that's what I was suggesting. Doing that would perhaps be the best option if you wanted to ask Iwaki to do a "special" order-run for you.

The RD-20 runs at 3200RPM though. If they're going to do a custom run of RD-20's, I would probably ask if the RPM's can be reduced to be 3000RPM at 12v though as that would be the better balance. The stock 3200RPM speed power-draw/heat-dump is still perhaps a fraction too high.

The other pump to consider would possibly be the RD-05H, rewired for 12v. Even though it has a peak flow rate of just 1.6gpm/6LPM, it has 8mH2O of pressure head. Even at 1.5gpm it's providing enough pressure head to drive a Storm plus a full-system 3/8" ID plumbed loop at that 1.5gpm. i.e. it's the sort of pump you'd buy if you wanted to achieve 1.5gpm with a minimum of fuss, size, and power-draw, for pretty much any system.

I do appreciate that the RD-05H is not the pedal-to-the-metal solution though that is obviously being sought after in this thread, but I still think it's something that should be considered.

The RD-05H's specs look nice but I wouldn't say it's very suitefull for watercooling, not even the best choice in that situation.

The main reason is simply that Panworld sells similar sized pumps which also have a pressure head of 9mH20 but have a peak flow rate of 8LPM.

What slightly concerns me is that while Iwaki's other RD pumps are rated continuous, the RD-05H is rated intermittent.
Now I know most of you guys don't run your pumps continuous, but it does not bode well IMO.

I think most round here run their pumps continous. My machine is only off when performing some kind of maintenance, otherwise it is NEVER off.

Hmmm, I must've missed that one. Ignore the RD-05H then.

Cathar, your thoughts on the Panworld PI 20/PI 30?

Thanks Cathar. I'll check into the cost on those as well. I'll post what they come up with and see if there is an interest for a group buy. If not, I'll just get a few standard RD-20s and have them rewound locally.

I would be all over the RD-20 @12V, especially if it's tweaked down to 3000RPMs. Even if it was in the $200ish range.

I would be in on this as well.

Any news/progress on this at all?