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  #101  
Old 03/02/2007, 10:47 AM
smjtkj smjtkj is offline
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Also, if you mount the propeller furthur up on the shaft as compared to the stock prop, the flow is all directed out of the outlet. It does not flow out of the side at all. Therefore the extra vents are all used for sucking in water. It is really incredible how much flow these pumps produce.

Mike
  #102  
Old 03/02/2007, 12:03 PM
Horace Horace is offline
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Quote:
Originally posted by kroe
I assure you that what I am saying is true, but... I used a MJ 1200 magnet to push the big prop.

I don't think the stock K4 magnet would have a chance at pushing anywhere near as big a prop as a MJ 1200. The stock magnet is puny - seems weaker than a MJ 400 magnet.
I totally buy what your saying, Im not sure you understood my question though. I DO intend on useing MJ1200 impeller on the K4 if I do decide to go with the K4. My only question is what is the biggest prop you can run on the K4 with the MJ1200 impeller?

This will mean I will have to order a couple MJ1200 impellers though. I do have a MJ900 modded with dual nitros...Is the MJ900 Impeller the same as the MJ1200??? If so that means I will only need to order one which would be nice.
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  #103  
Old 03/02/2007, 12:34 PM
chem-e chem-e is offline
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The nice part about working with MJ parts is that they're cheap. If the modded-K4 works well, I can by another K4 and an Mj impellor from MJmods for about $10.
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  #104  
Old 03/02/2007, 12:42 PM
smjtkj smjtkj is offline
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magnet

The magnet on the 900 and the 1200 are the same. You just break out the center insert and use stiff airline tube for the shaft sleeve. I used a 900 and a 1000 maxijet impeller magnet and they run the same.
Mike
  #105  
Old 03/02/2007, 12:49 PM
xinumaster xinumaster is offline
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Do you guys know if the the dry side magnet on the Koralia PH can be place inside the overflow box? Will it not leak some that will be bad for my tank?
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  #106  
Old 03/02/2007, 01:01 PM
smjtkj smjtkj is offline
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These have to be submersed.
  #107  
Old 03/02/2007, 01:24 PM
rufio173 rufio173 is offline
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Quote:
Originally posted by dhnguyen
That's not entirely true rufio173.


The MJ mod stream flow pattern depends much on how large the output on the shroud is and how long the shroud is. I used a 1.5" PVC slip coupler for my shroud and it has an ID of about 2 inches. The flow coming out of this MJ mod is very wide and dispursed with a definite cone shaped pattern.


D.
D,

You are absolutely correct. As I stated in my last paragraph, mileage may vary depending on the end user/modder.

I think the Koralia is great for modding. It is so much easier to do than the MJ 1200 mod, as everything is pretty much provided. All you need to do is get the MJ impeller, a prop and some stiff airline and you are good to go.

Cheers,
John H.
  #108  
Old 03/02/2007, 01:28 PM
rufio173 rufio173 is offline
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Quote:
Originally posted by xinumaster
Do you guys know if the the dry side magnet on the Koralia PH can be place inside the overflow box? Will it not leak some that will be bad for my tank?
The external magnet seems to be well sealed, so I'm guessing you can go ahead and shove the external magnet in your overflow box. I don't think the water will get to the magnet portion.

Actually, the external magnet looks alot like the internal magnet so I think both sides are pretty well sealed.

Cheers,
John H.
  #109  
Old 03/02/2007, 01:30 PM
smjtkj smjtkj is offline
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I misunderstood the question about the magnet!
  #110  
Old 03/02/2007, 03:59 PM
Horace Horace is offline
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So to answer my question from before, do you guys know what the biggest prop you can use with the MJ1200 impeller on the K4 is? I think my buddy tried the dumas 3004 with no luck. He didnt try trimming it any though.
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  #111  
Old 03/02/2007, 06:16 PM
kroe kroe is offline
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Horace - you'll need to experiment some...

I would start with an Octura 1440 or Dumas 3004 and trim them down slightly if needed. That way you'll get the max amount of flow out of them without playing guessing games with props.

I have trimmed down numerous props and they always work just fine... balance of the prop is not as critical as some seem to think (not critical at all IME).
  #112  
Old 03/02/2007, 06:37 PM
dhnguyen dhnguyen is offline
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Quote:
Originally posted by kroe
...
I have trimmed down numerous props and they always work just fine... balance of the prop is not as critical as some seem to think (not critical at all IME).
It is IME if you want it as quiet and with as little vibration as possible.
  #113  
Old 03/02/2007, 08:26 PM
Horace Horace is offline
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Does the Dumas 3004 move the most out of all props? Last I checked it did, but I am not familiar with the Octura 1440 and others. When I built my MJmod I dont think anyone was using the Octuras yet and the dual nitros were all the rage, I jumped on the bandwagon pretty early :P. Hell mine still has the soft flex airline holding the rigid airline on lol. Its still working like a champ almost 8 months later though.
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  #114  
Old 03/09/2007, 11:54 PM
filly469075 filly469075 is offline
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has anyone tryed to mod the smaller koralia like k1 or k2 for smaller tanks?
mike
  #115  
Old 03/10/2007, 12:43 PM
dhnguyen dhnguyen is offline
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The Dumas 3004 is the most reliable large prop to use for modding the MJ1200. The Octura 1440 will put out considerably more flow than the Dumas 3004 but some if not most MJ1200 pumps may not be able to handle it.
  #116  
Old 03/10/2007, 03:43 PM
slandis3 slandis3 is offline
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a warning for anyone who is useing a k2. A friend of mine had one short out in hs tank after 5 days of use. gave him a bad jolt when he stuck his hand in the sump
  #117  
Old 03/10/2007, 04:44 PM
Noise Noise is offline
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Quote:
Originally posted by slandis3
a warning for anyone who is useing a k2. A friend of mine had one short out in hs tank after 5 days of use. gave him a bad jolt when he stuck his hand in the sump
there is a recall on the K2's and K3's. Some people think the short is the reason. K1 and K4s are supposed to be ok. This is all addressed in another thread.
  #118  
Old 03/10/2007, 11:53 PM
kroe kroe is offline
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Lots of views on this thread. I did the proof of concept... can someone post pics and details of a polished version of this mod (with a stopper)?
  #119  
Old 03/11/2007, 01:56 AM
zeusfc zeusfc is offline
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Quote:
Originally posted by kroe
... balance of the prop is not as critical as some seem to think (not critical at all IME).
unbalanced props always cause vibrations... there's a completely different D I Y industry based on this principle!
  #120  
Old 03/11/2007, 01:07 PM
kroe kroe is offline
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Quote:
unbalanced props always cause vibrations...
I disagree completely. I am sure a drastically unbalanced prop would matter, but balancing it "by eye" is good enough.

Try it for yourself. Cut down a prop as evenly as you can by eye with scissiors, it will not be any louder or vibrate any more than it did before you cut it down.

I have modified tons of propeller pumps and always go with a prop that is a bit too big and trim it down. The only pumps that vibrate or make noise are those where the hole in the magnet is off center.

It does seem logical that balance of the prop would be very critical, but close is good enough. I think this is due to the high RPMs of the pump. The weight difference of the prop being slightly off is insignificant compared to manufacturing inconsistencies in the magnet (look at how inconsistent the hole in a MJ magnet is... those can't be even close to balanced). Heck... the super glue you use to glue the tube in the magnet probably introduces more weight variation than cutting down the prop.

I think that balancing the weight doesn't matter at all - getting it close is important because you want the two blades to have about the same surface area. Inconsistencies in the amount of water each blade pushes would result in way more vibration and noise than a fraction of a gram difference between each blade.

Please try the exact experiment I suggest before you tell me I am wrong - build a mod, try it, then trim the prop down as evenly as possible by eye, and try it again. Is there more vibration or noise?
  #121  
Old 03/20/2007, 07:47 PM
humboldt reefer humboldt reefer is offline
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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.
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  #122  
Old 03/21/2007, 05:56 PM
kroe kroe is offline
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What did you use for a stop?
  #123  
Old 03/21/2007, 08:57 PM
humboldt reefer humboldt reefer is offline
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I didnt make a stop for them. There eventually going onto some swirlsteins so I probably wont bother with them.
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  #124  
Old 03/21/2007, 10:04 PM
fewells fewells is offline
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I can only get the 1. what prop and magent should I use to get more flow? the stock magnet is TINY.
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  #125  
Old 03/21/2007, 10:24 PM
kroe kroe is offline
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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...
 

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