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Unread 09/11/2006, 08:50 PM   #751
Snarkys
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Quote:
Originally posted by ejmeier
Well, I've just studied washers for a good while, and I realized some things re: what we have been trying to do with various types of washers in between the magnet and the pump body:

There are two things we are trying to reduce - wear and friction. Teflon, as it turns out, by itself, is excellent at reducing friction, but is terrible in wear-resistance. (IE - it wears itself down quickly.)

On the other hand, there is ceramic, which a lot of pumps use. I have no numbers on this, but I'd guess they are pretty lousy at reducing friction when compared to plastics. But they appear to be very good at wear-resistance. (IE - they last a long time.)

So, it comes down to what you are trying to do - reduce friction, or reduce wear. Maybe its a little of both.

And to throw another wrench into all of this, turns out that the same plastic wearing on itself is usually not as good as dissimilar plastics wearing. One example given was Acetal (Delrin) on acetal wears itself down WAY faster than it would if it were wearing on steel.

Well, maybe I am rambling on and nobody cares. Anyway, if anyone is even interested, here's some good links I found:

http://www.zeusinc.com/newsletter/friction2.asp

http://www.tribology-abc.com/abc/polymers.htm

(Both have good charts/graphs near the end of the page.)
thanks , its good to know that one is better than two .

I have high hopes for the Kapton washers lasting a while.


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Unread 09/11/2006, 09:11 PM   #752
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Quote:
Originally posted by newtophish
MJ mod DIY gurus, Could one of you fantastic people start a new thread with just the DIY steps and lessons learned. I have read through the entire thread and I am going back and forth trying to find information. I hope I am not the only one who this would help.
Thanx

I found this today and it has the old style impeller build but what resource for people looking to build one . beats the hell out of pictures. he also has some other really cool videos on his site.

http://www.reefvideos.com



Last edited by Snarkys; 09/11/2006 at 09:46 PM.
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Unread 09/11/2006, 10:30 PM   #753
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ok snarkey that is the ultimate video to learn how to build these. great find! i had to open it using internet explorer. AOL wont open it. the video is long but its streaming so it loads pretty fast. thanks to who ever it is that made that video. now every time some one needs directions they can just send them a link to that video.


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Unread 09/11/2006, 10:52 PM   #754
dhnguyen
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AOL? Holy Crappola Spazz who uses that crap?

We need to get you on better things Spazz.


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Unread 09/11/2006, 10:55 PM   #755
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Quote:
Originally posted by dhnguyen
AOL? Holy Crappola Spazz who uses that crap?

We need to get you on better things Spazz.
i dont have time for spell check let alone changing my whole internet setup. ha ha ha ha
did you get a load ofthat video? its pretty cool. anyone know who made that? its a well put together video. i just finnished the 2 part dow flake cal/alk video. super easy to make. just need the 2 channel dosing pump to go with it.


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Unread 09/11/2006, 11:02 PM   #756
dhnguyen
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Quote:
Originally posted by spazz
i dont have time for spell check let alone changing my whole internet setup. ha ha ha ha
did you get a load ofthat video? its pretty cool. anyone know who made that? its a well put together video. i just finnished the 2 part dow flake cal/alk video. super easy to make. just need the 2 channel dosing pump to go with it.

Yeah I saw it the other day on another thread eiyther on RC or Reef Frontier I forgot. But yeah it's very well put together. The guy's name is Chris Morris (chrismo) and he had some other interesting vids on that site as well.


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Unread 09/11/2006, 11:09 PM   #757
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lol hes right , dump the AOL : )


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Unread 09/11/2006, 11:10 PM   #758
dhnguyen
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yes try Firefox on for size

D.


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Unread 09/11/2006, 11:22 PM   #759
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Where is the best place to buy the Octura 1435?

I am trying to mod a penguin 660 and am hoping this is the prop that will work.

I have found it at mjmod, but was hoping there was somewhere else I could buy it from.


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Unread 09/11/2006, 11:36 PM   #760
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Octura props can be ordered from http://www.funrcboats.com/category.aspx?categoryID=109
$2.99 plus $8-9 shipping, i forget.

or directly from Octura (they have no website nor email) they only take mailed in checks or add a$8 CoD and i think have $8 minimum shipping.

Octura Models Inc
(847) 674-7351
7351 Hamlin Ave
Skokie, IL 60076

long as i have been following this thread i don't think anyone has posted a different place that has them.

the best price is obviously to go the the hobby store. They are like $1.50 at mine.


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Unread 09/11/2006, 11:42 PM   #761
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Quote:
Originally posted by spazz
ok snarkey that is the ultimate video to learn how to build these. great find! i had to open it using internet explorer. AOL wont open it. the video is long but its streaming so it loads pretty fast. thanks to who ever it is that made that video. now every time some one needs directions they can just send them a link to that video.
Thanks, Ya, I did that. I showed the old way with the airline tube since it was simpler. But in the second video, I'll show the New way. And talk about general stuff I left out.

You can download it as a Podcast in itunes or whatever too if the Flash isnt working for you AOL users ( though I hope there isnt more than one of you )

Chris


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Unread 09/12/2006, 04:12 PM   #762
frezel
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ok man now im ****ed my mj mod was running great for a day and blam.. it strating spinning i guess in wrong direction and banging on stop and not righting itself, i unplug etc nothing it always seem to want to start in wrong direction, what could be the cause of this? the mod is perfect, just like my other mj900, im using the octura 1435...its centered , enough slits , etc. man this thing will not start the right way, and prop is on good too.has any else had this problem..please help asap i need flow


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Unread 09/12/2006, 04:18 PM   #763
Snarkys
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take it apart , clean it , reassemble ?

check the little red cap maybe ?


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Unread 09/12/2006, 04:29 PM   #764
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it brand new, and no dirt, also i think that red cap is for the centering rod, the shaft assembaly is what is sliding back and forth with the prop.it cause the entire assembaly to slide up the rod and makes baldes hit the stopper, also always spinning the worng way ... man this is so fustrating


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Unread 09/12/2006, 04:52 PM   #765
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Where is the cheapest place to get parts? Is it Towerhobbies, mjmods, or ?
I need to get a few props and cf tubes and rods. Thanks guys.


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Unread 09/12/2006, 05:34 PM   #766
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I'm sure this has been asked before but with 1000 of post to look through . . . . .

What kind of flow can I expect from a modified MJ900? Would two work well in a 40 breeder or would I need a third?

Thanks


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Unread 09/12/2006, 05:50 PM   #767
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Ksupermnp
I have two in my 40g breeder and would not run two if it wasnt a fully stocked SPS tank. The 900 with the Octura 1435 is estimated at 1500gph.

Frezel
If it is spinning in the wrong direction constantly that is usually a sign that the prop is too big for the motor or there is to much drag. Try to make sure everything is centered and if it is, then try cutting the prop down slightly and it should correct itself. I have had to do this a couple of times on some of mine


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Unread 09/12/2006, 06:05 PM   #768
frezel
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wakefreak33, u are a savior, i took the octura 1435 and shaved off just a tinybit and fired right up, thanks sooooooooo much, that was the only equation i never thought of, once again thanks sooooooooo much


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Unread 09/12/2006, 06:58 PM   #769
Neptune777
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How much of a gap should I have between the prop and the stopper when not running?


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Unread 09/13/2006, 06:29 PM   #770
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Do any of you get it to be as quiet as it was originally?

I've been trying to get it quiet/silent but I haven't yet managed to get it to a tolerable sound level. I'm using the Octura 1435 on a MJ900. Wondering if it's just not something I will be able to achieve.


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Unread 09/13/2006, 06:38 PM   #771
dhnguyen
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Quote:
Originally posted by Neptune777
How much of a gap should I have between the prop and the stopper when not running?
1/8 to 1/4 inches or so.


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Unread 09/13/2006, 06:41 PM   #772
dhnguyen
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Quote:
Originally posted by Gatorfreak
Do any of you get it to be as quiet as it was originally?

I've been trying to get it quiet/silent but I haven't yet managed to get it to a tolerable sound level. I'm using the Octura 1435 on a MJ900. Wondering if it's just not something I will be able to achieve.

There are several different types of noise from this mod.

1. magnet out of alignment and rubbing inside the motor housing
Does it quiet down without the shroud on?

2. propeller hitting the stopper creating a racket
Is the propeller constantly hitting the stopper?

3. humming from the propeller spinning
Is your propeller mounted backwards? Is it on straight?

4. vibration causing the pump to bump against the tank glass
How are you mounting the pump?

Which of the above are you trying to resolve?


D.


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Unread 09/13/2006, 07:10 PM   #773
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1. I can't seem to get it to run without the shroud on. It either does nothing or spins backwards, ejecting the magnet and propeller.

2. Don't think so. I took the stopper out and it still makes noise.

3. The notches in the 1435 are towards the MJ, if that makes sense. I think it's on the right direction.

4. Suction cups, don't think it's hitting the glass.

I'm guessing from your response that people do, indeed, get it to run silently. So I'll keep trying. I'll try some more without the shroud.

Thanks


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Unread 09/13/2006, 07:21 PM   #774
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Mine are quiet. I have to put my ear to the glass to hear them...quieter than a standard MJ.


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Unread 09/13/2006, 07:34 PM   #775
dhnguyen
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Quote:
Originally posted by Gatorfreak
1. I can't seem to get it to run without the shroud on. It either does nothing or spins backwards, ejecting the magnet and propeller.

2. Don't think so. I took the stopper out and it still makes noise.

3. The notches in the 1435 are towards the MJ, if that makes sense. I think it's on the right direction.

4. Suction cups, don't think it's hitting the glass.

I'm guessing from your response that people do, indeed, get it to run silently. So I'll keep trying. I'll try some more without the shroud.

Thanks

Yes they can be made to run silent or as close to the stock MJ at any rate. How is yours noisy? Did you make your own shroud and cross brace or built from a kit from mjmods.com?

Also what are you using for the rod? Stainless steel or carbon fiber? Are you also using the rigid tube as well with these? is there a lot of play inside the rigid tube and the rod?


D.


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