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General Liquid/Water Cooling Discussion For discussion about Full Cooling System kits, or general cooling topics. Keep specific cooling items like pumps, radiators, etc... in their specific forums.

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Unread 05-12-2003, 09:01 PM   #1
bigben2k
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Default Johnson pump deal?

Going through my junkmail, and actually following up on some of the interesting tidbits...

I found a source for that Johnson pump some of us have been dreaming about:

click me!
(edit: session ID removed)

Specs are: Permanent magnet motor. Furnished with mounting bracket. Requires flooded inlet. Not self priming.

12 volts DC
2.2 amps
Duty continuous
7 GPM @ 1.5 PSI
Ports 3/4" hose barb
Temp range 40 - 170 deg F
Size 6" x 3" x 2 1/4"
Shpg 2 lbs


At $29.99, it's hard to beat!

Last edited by bigben2k; 05-13-2003 at 09:11 AM.
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Unread 05-12-2003, 09:25 PM   #2
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Err ok... there's still 416 in stock, how come?

Here's the thread with the details as to why it's such an amazing pump. (Sorry Nexxo!)
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Unread 05-12-2003, 09:58 PM   #3
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Well if a certain pump doesn't arive soon I might have to look into this one. Might look into it anyway.
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Unread 05-13-2003, 03:56 AM   #4
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Iv´e got that pump inn my rig now.

I´m ok pleased with it, but one thing you all need too look out for is the heat it generates, iv´e allready had too, retrn one because it´died on my, sniff... but a little fan that is blowing over it at all times keeps it under controle

The pressure is good, but the flown rate isn´t the best.

All inn all, and ok pump for the size, but not for the cheap pepole out there...





-Edit-
The price here inn norway for this pump is about 100$ so you get it CHEAP!

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Unread 05-13-2003, 05:11 AM   #5
dima y
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YOU PEOPLE MAKE ME SPEND TOO MUCH MONEY

remind me what does not self priming mean. Just before i buy it

btw bigben2k did you buy one?
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Unread 05-13-2003, 08:08 AM   #6
mad mikee
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At that Price I'll take 2!!!

Interesting thing when I ordered and added myself as new customer, your info was there, Ben?:shrug: Not there anymore (and thankfully neither is mine
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Unread 05-13-2003, 08:40 AM   #7
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I think I fixed it, thanks!

It must have setup an ID on the session: I entered my info after posting the link!

Well, I guess some of you know who I am . I just hope no one ordered one on my account
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Unread 05-13-2003, 08:46 AM   #8
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More Info?

Looking at specs looks like unmarked CM-30, but what does 1.5 PSI translate to as far as head?, is this good?(I hope):shrug:

/edit never mind read the other thread and so 3ft, 356 GPH. now to figure out when to add it to the new setup.
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Last edited by mad mikee; 05-13-2003 at 08:58 AM.
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Unread 05-13-2003, 08:50 AM   #9
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1.5 psi is about 3 1/2 feet (41.5 inches to be exact), and that's not the maximum...
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Unread 05-13-2003, 08:51 AM   #10
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Wow junk mail that was useful What next ???
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Unread 05-13-2003, 09:15 AM   #11
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Quote:
Originally posted by dima y
remind me what does not self priming mean. Just before i buy it

btw bigben2k did you buy one?
"not self priming" means that if you run a hose from the inlet to a bucket, it's not going to suck up the air, so that it can run the water.

No I didn't pick one up yet, but I'm so tempted! I don't think Radius would go well with it. I'm also hesitant in putting an inductive load on my PSU.

For more power, I might pick up two of them, but my budget doesn't allow that frivolous expense right now
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Unread 05-13-2003, 10:14 AM   #12
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Quote:
Originally posted by bigben2k
" I'm also hesitant in putting an inductive load on my PSU.

so your system doesn't have any fans or other components with motors in them, like harddrives, cdrom's ect...

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Unread 05-13-2003, 10:31 AM   #13
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It's not likely that pump behaves like an inductive load anyway.

More likely it behaves like a brushless DC fan and puts pulses of current through the windings. Hard to say how high the instantaneous current draw might get. It might be a good idea to put a fat capacitor in parallel with one of these.
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Unread 05-13-2003, 10:48 AM   #14
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Maybe because it's on the 12v line, it won't affect system stability.

I like the cap idea. Any idea what rating? Nexxo's pump draws 12 volts, and has a max power rating of 26 Watts, for a max amperage of ~2.2 amps. I know it's useless without knowing the RPM.

In the mean time, I found a spec sheet for this pump:
http://www.johnson-pump.com/JPMarine...IB-CM10_30.pdf (PDF, 20 pages)

Here's the flow curve, for all three variations:
http://www.johnson-pump.com/JPMarine...10_30_c090.htm

The good news is that this Johnson pump is the heavier model that Nexxo described, the CM30P7-1.

A quick chart gives these flow/pressure ratings:
3.3 feet @ 6.9 gpm
6.6 feet @ 5.2 gpm
9.8 feet @ 2.4 gpm

Max pressure: 5 psi: that's 11 1/2 feet, or 3.5 meters.
Max flow is 30 l/m, that's 7.9 gpm, or 474 gph.
That's a good pump!!!

Last edited by bigben2k; 05-13-2003 at 10:58 AM.
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Unread 05-13-2003, 11:14 AM   #15
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Quote:
Originally posted by bigben2k
I like the cap idea. Any idea what rating?
I'd guess something like a 2200uF, 16V, aluminum electrolytic.

Without seeing waveforms on a scope though, it's a pretty rough guess.
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Unread 05-13-2003, 11:27 AM   #16
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I'm googled out, for an RPM.

I'm picking one up: can't take it anymore!

PS: the housing is rated for max 2.5 bars, which means it can handle a few of these connected in series.
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Unread 05-13-2003, 01:55 PM   #17
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I decided to pick one up. For $30 it was worth the gamble and I still have a few regular pumps around for a backup just in case it doesn't work out.
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Unread 05-13-2003, 01:59 PM   #18
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412 left...
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Unread 05-13-2003, 06:01 PM   #19
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thx for the reply got 2!
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Unread 05-14-2003, 02:21 PM   #20
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I'm going to have my brother pick up a few. He wants to build a watercooled dually in a briefcase (approx. 3U sized) with a foldout LCD monitor, one power plug, and a completely silent design. This pump would aid in keeping the size down.
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Unread 05-14-2003, 02:39 PM   #21
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408 left...

The pump is 6 inches long, and max 3 inches high. The diameter of the housing appears to be a bit more than 2 inches.
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Unread 05-14-2003, 02:42 PM   #22
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@ Bigben: darn, you beat me to it! No probs, it is a pump worth mentioning.

The CM30P7-1 is indeed outstanding. Built like a tank. Like the other Johnson (a.k.a Jabsco), it too gets a bit hot during normal operation (about 53 degrees C).

Quote:
I´m ok pleased with it, but one thing you all need too look out for is the heat it generates, iv´e allready had too, retrn one because it´died on my, sniff... but a little fan that is blowing over it at all times keeps it under controle
... and that is exactly why I mounted mine where I did... just behind the Rad fan, so it picks up some of the airflow, but without obstructing it.



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Unread 05-14-2003, 03:07 PM   #23
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What waterblocks did you use there?
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Unread 05-14-2003, 03:12 PM   #24
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This one. There's some threads on them in this forum.
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Unread 05-16-2003, 10:17 PM   #25
mad mikee
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silly question

Got my pumps. VERY Compact for the power.

Planning to get the WW mk 2 from DTEK.

How does the idea of the pump being suspended w/about 6" of tube feeding the inlet of the above wb sound as far as a good idea. Would it be worth it? :shrug: block would only be about 15" above pump in present system.
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