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  #76  
Old 02/01/2007, 12:43 AM
smjtkj smjtkj is offline
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sorry
  #77  
Old 02/01/2007, 09:37 AM
kroe kroe is offline
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Glad others are trying this mod.

I think that if you make the new magnet, prop assembly the same length as the stock one it will always spin the correct direction without a stopper. I haven't tried it though.

Anyone tried a really big prop on this thing?
  #78  
Old 02/01/2007, 07:24 PM
N-A-S-O N-A-S-O is offline
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what prop are you using ken? I'm using the one I got from you and I can't seem to get it to spin underwater however it does spin partialy out of the water..not like that helps
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  #79  
Old 02/01/2007, 08:34 PM
kroe kroe is offline
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What happens when you start it out of the water then put it in?

The one I gave you was an Octura 2035. Are you using that with the stock magnet or a MJ 1200 magnet?

I was using an octura 1440 (about the same size as the 2035) with a MJ 1200 magnet.
  #80  
Old 02/01/2007, 08:54 PM
N-A-S-O N-A-S-O is offline
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using the MJ 1200 magnet..it spins untill i fully submerg it. then it stops
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  #81  
Old 02/01/2007, 09:30 PM
dhnguyen dhnguyen is offline
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maybe your prop is too big

What prop did you use?
  #82  
Old 02/01/2007, 09:34 PM
N-A-S-O N-A-S-O is offline
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yeah at first just for the hell off it I did use a large prop, but then I used one that was like a Octura 2035. The prop didn't have a name on it when I got it from the hobby store so I am unsure what it really is
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Last edited by N-A-S-O; 02/01/2007 at 10:26 PM.
  #83  
Old 02/01/2007, 09:43 PM
rufio173 rufio173 is offline
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Quote:
Originally posted by smjtkj
Kroe, thanks for the idea! I modded 3 of the koraila 4s tonight. I used the stinger 1.5 inch props on mj 900 impeller magnets. I did the rigid tube into the magnet mod. All I can say is WOW! These pumps are outperforming Tunze and Reun by appearance of the water movement. I directed them to exactly the same direction as tunzes and they blew up detritus into the water column. I didn't think I had detritus...And the pumps start in the right direction most of the time. Worlds most awesome 5 minute mod!

Mike
Soooo, a little more details on the Tunze model. I mean, that does make a difference. Are they 6000, 6100, or 6200s? Or are they the non-controllable models like the Tunze 6080?

Peace,
John H.
  #84  
Old 02/01/2007, 09:52 PM
smjtkj smjtkj is offline
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Quote:
Originally posted by rufio173
Soooo, a little more details on the Tunze model. I mean, that does make a difference. Are they 6000, 6100, or 6200s? Or are they the non-controllable models like the Tunze 6080?

Peace,
John H.
6100, and Resun wavemaker
  #85  
Old 02/01/2007, 09:57 PM
rufio173 rufio173 is offline
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Thanks smjtkj...

That's pretty interesting. Do you have the 6100 on full blast?

Also, wouldn't the 1435 work better than those larger props you guys are using? I mean, the magnets and impeller rotor is much smaller than the MJ1200s so it's going to be pushing it to turn such a large prop such as the 1440...

Looks like smjtkj is having great results with a mid sized prop.

Peace,
John H.
  #86  
Old 02/01/2007, 10:06 PM
dhnguyen dhnguyen is offline
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The Octura 2035 (orange) is actually a very aggressively pitched propeller and you would be hard pressed to get that to spin on the MJ1200 let alone the Koralia.

Try the Octura 1435 (brown)


D.
  #87  
Old 02/01/2007, 11:01 PM
kroe kroe is offline
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The 2035 is aggressively pitched, but small - it's about the same as a 1440 flow wise. I had the koralia 4 working great with a 1440 using a MJ 1200 magnet.

The magnet these come with is puny and likely won't push much more of a prop than stock.

Naso - try trimming your 2035 down slowly with scissors until it works. The balance of the prop doesn't really matter (contrary to opinion) since it it spinning so fast, just try to get it as even as possible by eye.

This thing would drive a 1435 no problem, it drives a slightly trimmed down 1440 no problem (the 1440 was trimmed to get it to work on a MJ 1200, not trimmed down for the koralia).

I'd love to see someone try a big dumas.
  #88  
Old 02/01/2007, 11:29 PM
scarter scarter is offline
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  #89  
Old 02/17/2007, 10:05 PM
HydroMan HydroMan is offline
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Has anyone tried this mod with a smaller koralia? I'm curious how many extra gph can be gotten out of the smaller units. I have a magnet for a mj900 and wonder what could be done with it using a 1, 2, or 3.
  #90  
Old 02/18/2007, 01:08 AM
kroe kroe is offline
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I'd try an octura 1435 with a mj 900 magnet in the k2/3 (same thing, different impeller I think).
  #91  
Old 02/26/2007, 11:35 AM
chem-e chem-e is offline
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kroe - So how you liking the K4 modded thus far? I've been debating about buying the K4 and modding it vs modded an old MJ1200 that I have collecting dust. I'm looking for something with more juice than the Seio1100s that I'm currently running.
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  #92  
Old 02/26/2007, 12:46 PM
AZDesertRat AZDesertRat is offline
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Where do you buy the Octura propellers, a hobby shop or....?
  #93  
Old 02/26/2007, 12:55 PM
dhnguyen dhnguyen is offline
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You can try to find the Octura props in hobby shops or contact the company directly and order them via mail order (they do not have a website nor email)

Octura Models Inc.
7351 N Hamlin Ave., Skokie IL 60076, United States
(708)674-7351


funrcboats.com do carry some as well but they're a bit more expensive there.
There's also mjmods.com too
  #94  
Old 02/26/2007, 07:47 PM
kroe kroe is offline
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Modding the k4 was just an experiment for me, so I don't have any long term experience with it.

The k4 will look slicker than the mj and has a nice magnet mount, while the MJ has more potential.
  #95  
Old 03/01/2007, 11:34 PM
Horace Horace is offline
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Hey fellas, anyone else determine the biggest prop you can use on the K4?? I am really flopping back and forth on which I want to go with... Modded MJ1200 or Modded K4??? The K4 is definitely bigger, but looks a bit more finished, has a magnet, and is directional.. Are you guys still thinking the MJ1200 mod can push more water? I thought the best the MJ1200 could do was 2400gph or so? If what Kroe is saying is true, then isnt the K4 doing just as good?
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  #96  
Old 03/01/2007, 11:40 PM
chem-e chem-e is offline
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I'll be trying the mod on the K4 in a couple of weeks. I just ordered mine and it's supposed to arrive next week.
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  #97  
Old 03/02/2007, 12:19 AM
kroe kroe is offline
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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.

The one thing I didn't worry about with my experimental mod that you would have to with a permanent one is a stop for when the prop spins in reverse. Should be easy enough to construct, but unless you feel like tinkering with something new you are better off with the tried and true MJ 1200.

If you want to make a MJ mod with some of the koralia goodness try to hunt down a koralia magnet mount (I bet hydor will sell you one). It's not hard to adapt to the MJ 1200 and is much slicker looking, lower profile, and more adjustable than a sure grip magnet.
  #98  
Old 03/02/2007, 12:50 AM
smjtkj smjtkj is offline
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Korillia 4 modded definitely does more than a 1200 modded.
  #99  
Old 03/02/2007, 09:17 AM
rufio173 rufio173 is offline
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Quote:
Originally posted by smjtkj
Korillia 4 modded definitely does more than a 1200 modded.
This is just really, really hard to guage since they put out entirely different flow patterns. Your standard MJ 1200 mod will put out a lot tighter stream.

The Koralia will put out a much wider stream. I think the koralia has the biggest advantage because it has almost no resistance on its performance. It has a huge grate around the prop and the the exit orifice is huge (if you also include the additional grates that I feel that flow also comes out from)! Therefore, I feel resistance to flow both on intake and exit are much lower on the koralias, which means more efficiency.

With that being said... the koralia 4 impeller is quite small compared to the MJ1200's. If the MJ1200s were designed like the koralias, then I'd say the MJ1200 mods would have more flow, but since they aren't, it's tough to say one way or another. Plus, mods are totally dependent on the end user, so that throws in another variable to consider.

Cheers,
John H.
  #100  
Old 03/02/2007, 10:12 AM
dhnguyen dhnguyen is offline
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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.
 

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