Hydor Koralia Super-Mod

Just thought I'd jump in. I got a couple of koralia 4's the other day and trimmed a little less than 1/16" off the trailing edge of 2 dumas 3004's. Fired them up and I cant tell the difference between them and my mj 1200's using the same prop.
My mj mods flow pretty good also. The shrouds are 1.5" couplers completely cut away to give a skeleton to ziptie gutter gaurd around.
 
humboldt: fewells made me think... what did you use for a magnet, you aren't running the 3004 on a stock koralia magnet are you? My bet is you used a MJ 1200 magnet, but just to be clear...
 
I'm having a problem with the prop spinning in the wrong direction. I have a Dumas 3004 on a MJ1200 magnet and it looks just like Kroe's picture on the first page. When I start it up, it pops out and then eventually starts spinning, but it spins in the wrong way. It does a great job cleaning the pump, but I'd like to get it to spin in the right direction. Any ideas?
Thanks
 
I just recieved a K4 as a replacemment for my recalled k2. The flow is fantastic and I don't think I will mod.
 
<a href=showthread.php?s=&postid=9558275#post9558275 target=_blank>Originally posted</a> by chem-e
I'm having a problem with the prop spinning in the wrong direction. I have a Dumas 3004 on a MJ1200 magnet and it looks just like Kroe's picture on the first page. When I start it up, it pops out and then eventually starts spinning, but it spins in the wrong way. It does a great job cleaning the pump, but I'd like to get it to spin in the right direction. Any ideas?
Thanks
Click to expand...
Trim the prop down a little.
 
<a href=showthread.php?s=&postid=9559087#post9559087 target=_blank>Originally posted</a> by smjtkj
Trim the prop down a little.
Click to expand...

Thanks. I'll give this a try, but I'm curious why this would help. I can understand if the magnets weren't strong enough to turn a larger prop, but how does a smaller prop help induce the prop to turn in the right direction?
 
Actually it should be the opposite. Your prop is not large enough to pull the magnet out of the motor when it is running in reverse, so it got stuck on the reverse flow. If the prop is larger, the force of the reverse flow will be able to pull the prop unit out of the motor socket more and allow the magnet to escape the magnetic field of the motor, when that happens the prop stops spinning, and the unit is then sucked back into the hole, a new startup attempt will begin, and this time the rotation may be correct, if not the self-correct process will just repeat itself until the prop get to spin right.

I thought the Octura 1440 works well in K4 and is bigger than Dumas 3004.
 
Try covering the opening in front of the prop with your hand and
removing your hand. It should reverse right away. If it doesn't,
try trimming the ends of the prop down a little at a time. That should do the trick.
 
Well my koralias are FINALLY on the way. Foster & Smith has a big back log on these pumps. I ordered them almost a month ago and they just shipped them yesterday. I also bought myself a Reefkeeper2 so I can run them on an hour on/off cycle. Running dual modded K4s will be too much for my 75g.

My plan is to have each pushing ~2000gph and switch them to create some changing current in the tank. Right now I have a MJ900 modded with Dual Nitros and a Seio 820, both running on the same side of the tank with no switching. Each K4 mod should put out as much or more flow than both those pumps combined, plus its going to switch. Im really looking forward to it :)
 
Got my K4 and did a quick mod, I used a Tunze 6060 prop with a MJ1200 impeller magnet, the flow increase was marginal and the pump was drawing 19W!!! Although the K4 motor was barely keeping up with the 6060 prop so that may be the cause for inefficient operation.

Will try to use an trimmed down Octura 1440 to see if it will improve the pumping and power use.
 
I did manage to improve the K4 mod to the point it now draws 16W, and based on the trimming done on the prop and my feel of hand between the modded K4 and my modded 6025, I'd say the K4 modded pumps out about 1600gph.

I found out the best match of the prop and magnet is the Octura 1240 with the MJ1200 impeller unit. I only needed to pop out the stock impeller out of the magnet, and slide the 1240 prop down tightly. For the testing purpose I did not even have to glue them together. Below are some pictures:

MJ1200 impeller drive unit fitted with a Octura 1240 prop:
16865K4-3.jpg


Modded prop unit in the K4 motor:
16865K4-2.jpg


Amount of trimming needed on the 1240 prop to get it to work with the K4 motor:
16865K4-1.jpg


I am currently working on reducing the size of the K4 by at least 1/3, only after that I would allow it in my tank.
 
Last but not the least, pictures of the original K4 and the downsized K4, with my modded 6025 for comparison.

1st, the original K4:
168656025_K4.jpg


2nd, the downsized K4:
168656025_K4-2.jpg


I cut about 3/4" off the cap of the K4, also cut the shaft and shaft holder on the cross bar accordingly. This is not only to reduce the size of the K4, more importantly to turn the cross bar into a stopper so at the startup if the prop spins backwards, the blades hit the cross bar and stops, goes back into the socket and corrects the spin. This makes the self-correction less noisy and much more swift.

The only thing I can think of is trying to attach the modded K4 to a Seaswirl to create wave motion, since the K4 can not be put on an on-and-off timer.
 
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