mjmods VS. Koralia
- Thread starter zbrook1
- Start date
<a href=showthread.php?s=&postid=9966956#post9966956 target=_blank>Originally posted</a> by dhnguyen
you're right but then that would make the point about how versatile the nano and koralia mounts are moot wouldn't it?
Of course not, the point was they can be more versatile than the MJMods without having to buy a $130 seaswir.
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what sorts of measurements are you looking for? of the actual mod or the flow rate tests I did?
I agree with you that a more conclusive test could be done fairly easily given the resources and knowledge (both of which I lack) Unfortunately I don't know of any companies that actually did these types of tests and if they did, they certainly didn't publish their test data and procedure.
From what I have seen and tested, the koralia self correct its spinning when the prop is spinning in reverse. To do this without a physical stopper, you need make the shroud long enough so that there's ample room for the magnet to slide forward and break the magnetic field and stop spinning and self correct.
The smaller nano 6025 does not have a physical stopper and this version does have a problem with reverse spinning at times and self correction doesn't always happen. Often I had to unplug and plug it back in several times before it spins the right way.
This is just based on my own observation of course...
jmkins
New member
Use both volume and mass. Put scales beneath both the output tub and the input tubs. This would provide another variable to measure.
I personally think that both the source and drain should be solid (instead of one being a flexible bag) and both should be measured off (graduated) before the experiments are run.
Personally, I'm a broke engineering grad student who cant afford to buy all the necessary pumps and test them. I wish I could right now but I'm two steps away from food stamps. I do have access to modeling software, if enough people will put up numbers here I can try to do what I can on my free time. The mjmods should be fairly easy to model as they are straight tubes with specific openings, the other pumps have more sophisticated geometries. I am willing to try, but I dont have much free time so I cant guarantee that I can get that done.
And BTW, if I were the manufacture, I would not waste 40 hours of my engineer time to come up with a flow test model if all I needed to do was to hire two laborers to do a simple bag test for me in five minutes, as long as my pumps are selling like hot cake.
Here is the difference between a businessman and an engineer and I am neither.
Here is the difference between a businessman and an engineer
and I am neither.
Of course, how can you ask a 12W motor to pump out as much as a 20W motor can?
dhnguyen had also said the high flow MJmod does about 2000 gph, at around 19W, so I have multiple evidence to support my earlier notion the claim of 3000 gph at 12W or 2000 gph at 12.75W were likely false.
There was never dispute the MJmods can deliver more flow than K4 and Nanostreams. But MJMods are not any more efficient than K4 and Tunze 6025, in fact a modded 6025 (1250 gph at 7W) should be the most efficient among the three.
There is different in term of flow between 2" shroud and 2.5" shroud. With 2" shroud, mj 1200 only consumes about 14 watts. I honestly believe 2400 gph (with large shroud) claim by mjmods.com. Flow of Resun 15000 pump at high setting is still weaker the mj 1200, both have 2" opening. Resun is exaggeratedly rated 4000 gph, 2500 gph is more reasonable, imo. If have time, I will make a short video of them running side by side.
I don't doubt the MJ1200 can pull a lot more juice than the K4 much less 6025 motor, the MJ600 and MJ900 can also do that because they have larger motors, even if the motor was rated by the manufacture as 8.5W or whatever because the rating was based on the size of impeller it was tested more so than the actual motor strength. The 900 has smaller impeller yet the 600 even smaller, so they pull less watts than 1200 but the motors can be over-driven.
The bottom line is you need more watts to get bigger flow, no getting around that, it is simple physics. I don't see any evidence that the design of MJ motors that should make them more efficient than the K4 motor, or 6025 motor or any other similar type AC motors. Use of terms such as "honestly believe", "considerably more (or less)" are not the same as actual tested results. I felt my modded 6025 pumped more flow than my modded K4, but the K4 has 1700 gph by flow test, 6025 1250 gph by flow test simply because the K4 flow goes out sideways.
You can feel more powerful flow when the shroud is narrower and flow is more focused, even though the flow itself is less, because what you felt was the force (velocity) of the flow, not quantity of the flow.
As for the Resun pump, since their claim of 4000 gph at 25W is so clearly outrageous I wouldn't even dare to use that pump as comparison unless you actually can do some real flow tests first. Keep in mind it is a DC pump so the outside transformer even the controller use watts not just the motor and depends on the quality or design, the transformer can drain a lot of energy if it runs very hot, so I am not surprised at all it felt less powerful than the MJ1200 mod. The 4000 gph, and even the two lessor Resun flow ratings, simply can not be trusted.
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RichConley
New member
30g Trash Bag, Killawat.
Thats how I tested. Now, if you want to keep refuting my claim, provide some actual evidence, or shut up. I'm gettin really sick of your completely bogus claims.
RichConley
New member
No, its not that simple. There are things such as efficiency, slippage, etc. WHen I opened up the back end of the shrouds of my maximods, they moved MORE watter, and used LESS wattage. Shroud design is EVERYTHING.
Saying more flow=more wattage is completely ignorant.
FWIW, DC motors are more efficient than AC motors, so you MAY be wrong about the Resuns (I dont know, I havent used them)
Well then why don't we see all the MJMOds people rush to your defense? Don't get me wrong we all want your 3000 gph and 12W, but there must be something going on with yours when all other MJ1200 mods high flow kits came to 2000 gph at 18 to 19W.
You still hasn't told us how you tested yours. The name calling does not scare me you should have learned that by now. And if you think by doing so you can appear more credible or trustworthy to the readers think again.
I am not letting you off the hook Rich, you asked for it when you barged in on our nano discussions with your claims which are still not explained or can be substantiated by other MJmod users to date.
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