The "Hitchhiker's Guide" to the Maxi-Stream mod - Page 43

quangtam7 · 09/22/2006, 03:39 AM

Here big 2.5" shroud I am planning to use on mj 1200 for super wide flow, the prop will be Octura Z55 (~2.2"). I think to make this prop work on 1200 without sacrifying the diameter I will need to reduce the pitch by trimming down the rear side of the blades (see pic of Dumas 3004), make it like an airplane prop, this of course will make the flow gentler. Stay tuned!

Gatorfreak · 09/22/2006, 09:33 PM

Update on my previous noise problems:
I changed my build and used a carbon fiber tube run all the way through the magnet and a staineless steel rod. Now it's very quiet.

Has anyone tried the magnet mounts for sale at MJMods? If so, how is it?

PVsPlayHouse · 09/25/2006, 05:06 PM

This is what happened to my MJ mod has this happen to anyone else?
The impeller broke right through the back of the maxi Jet. It knocked
off the backing of the MJ and cracked through the plastic holder that
holds the Red and black bushing. I also cant find the o-Ring that came
with the Mod is this needed? Im going to use my other MJ with this mod but before I do, has this happen before? what can I do to make sure it does not happen again. I got the large mod with a bigger Prop. I think it was the 1440 but not sure.

quangtam7 · 09/25/2006, 05:37 PM

Do what I did in first picture, make the rod stick permanently, you won't need center brace.

PVsPlayHouse · 09/25/2006, 05:56 PM

Im must be lost what did you do in the first pic that made it not need a center brace?

Chrismo · 09/26/2006, 08:39 AM

So the electronics are still sealed with that thing off?

Would attatching another propeller on that end be an great way to get alternating flow every time the pump turns on and off. One propeller-end is always sucking, the other is pushing.? when the pump runs the opposite way, it would swich directions.

Just need to stabilize both ends with another shroud.

miatawnt2b · 09/26/2006, 10:47 AM

I was worried about this exact thing happening. I noticed that the SS rod was spinning the other day. Either the rod is spinning in the black bushing, or the whole bushing is turning which would cause the failure mode you saw. I think it would be a good idea to epoxy the rod into the bushing, and epoxy the bushing into the MJ. Then figure out how long the slip washers mentioned earlier last, and use those between the magnet and the bushing replacing them before they wear away.

I think the props are just too much backwards power and pressure for what the MJ was designed to do.

-J

dhnguyen · 09/26/2006, 11:01 AM

Personally I have never experienced that problem with any of my mods. For the back nub to wear out and break like that it must have been a tremendous amount of force. I can see it being possible if you had perhaps dropped the MJ once or twice and caused a hairline crack in the back--just enough so to weaken the whole thing. IMO I don't think the backward force from the impeller/propeller is strong enough to break that by itself.

The SS rod shouldn't be spinning at all. I would check to see if it's actually the SS rod or the end cap bushing is spinning. The bushing should fit the MJ pretty snugly and should not be spinning IMO.

D.

fload · 09/26/2006, 03:43 PM

I did the mod on a 1200 and its putting out way too much flow what would be the best way to reduce flow? Cut prop down? Of so what's the best way, and would it be stable or cause vibrations?

dhnguyen · 09/26/2006, 03:54 PM

Either cut down the prop or use a smaller one.

The best way to cut down a prop even IME is by attaching the prop to a drill and let it spin against some sandpaper.

D.

gary faulkner · 09/26/2006, 07:45 PM

Quote:

Originally posted by PVsPlayHouse
Im must be lost what did you do in the first pic that made it not need a center brace?

quangtam7

I would like to know also

Thanks

ahchung · 09/27/2006, 03:34 PM

Can MJ-1000 be modified in this way?

bskiba · 09/27/2006, 03:55 PM

Quote:

Originally posted by ahchung
Can MJ-1000 be modified in this way?

YEs

quangtam7 · 09/28/2006, 01:09 AM

Quote:

Originally posted by PVsPlayHouse
Im must be lost what did you do in the first pic that made it not need a center brace?

Use a drill press to drill a hole (3/32" bit) on a small piece of acrylic, insert the rod, mount it on a drill and run against a sanding pad to make it round, then superglue (or use weld on 4) to mj.

RichConley · 09/28/2006, 08:57 AM

so you made it a fixed shaft, essentially?

fload · 09/28/2006, 10:07 AM

Quote:

Originally posted by dhnguyen
Either cut down the prop or use a smaller one.

The best way to cut down a prop even IME is by attaching the prop to a drill and let it spin against some sandpaper.

D.

Worked great! I spun it with a drill against some sand paper took down the flow perfectly and also runs almost silent used to hum a bit from vibration
Thanks mjmod gods

bklynmet · 09/28/2006, 12:31 PM

dhnguyen ... the answer to my question is probably somewhere in this thread but figure I'd ask directly instead of hunting for it.. I plan on doing the mod on two MJ1200s for my tank and a fellow local reefer want to make one as well for his - so it'll be a good group build to do.

What are the pros/cons of the drilled hole version for the shroud? Same question for the slotted version like on MJ Mods?
I'm interested on the performance aspect - like if one has a great likliehood of causing the 'vortex' and sucking in air over the other design.

I have a table saw and should be able to make a jig for the slotting option. Also have a drill with a variety of bits. So the 'manufaturing' aspect may not influence my decision as much as performance.

Thanks in advance.

dhnguyen · 09/28/2006, 12:52 PM

holes:

pros - easy to do
cons - cosmetically maybe although personally I don't think there is really any other than personal preference for the look.

slots:

pros - cosmetic
cons - harder to do as they require some tools and a steady hand

performance is the same on both

vanceny · 09/28/2006, 01:12 PM

Guys,

I'm trying to find the page where someone did a test regarding gph these things push. I have some disbelievers that need some kind of proof.

thanks.

quangtam7 · 09/28/2006, 02:14 PM

Short video clip
http://video.google.com/videoplay?do...13810789461735

09/22/2006, 09:33 PM	#842
Gatorfreak Registered Member Join Date: Sep 2004 Location: Gainesville, FL Posts: 27	Update on my previous noise problems: I changed my build and used a carbon fiber tube run all the way through the magnet and a staineless steel rod. Now it's very quiet. Has anyone tried the magnet mounts for sale at MJMods? If so, how is it? __________________ Go Gators! Current Tank Info: 90 gal reef

09/25/2006, 05:56 PM	#845
PVsPlayHouse Registered Member Join Date: Aug 2004 Location: NY Posts: 50	Im must be lost what did you do in the first pic that made it not need a center brace? __________________ 120 Reef tank Dart pump AquaC EV 240 Protein Skimmer Neptune Systems Aqua Controller II Aqua Medic Kalkwasser Reactor Aqua Logic Delta Chiller 1/4HP 25w Aqua UV Lighting- 2 150W HQI 13K, 2 96 W PCs.

09/26/2006, 08:39 AM	#846
Chrismo Premium Member Join Date: Apr 2002 Location: Toronto Canada Posts: 416	So the electronics are still sealed with that thing off? Would attatching another propeller on that end be an great way to get alternating flow every time the pump turns on and off. One propeller-end is always sucking, the other is pushing.? when the pump runs the opposite way, it would swich directions. Just need to stabilize both ends with another shroud. __________________ Just mind your water and your fish will mind themselves. Current Tank Info: 157g

09/26/2006, 03:43 PM	#849
fload Registered Member Join Date: Sep 2006 Location: bakersfield, CA Posts: 145	I did the mod on a 1200 and its putting out way too much flow what would be the best way to reduce flow? Cut prop down? Of so what's the best way, and would it be stable or cause vibrations? __________________ One fish two fish red fish blue fish Current Tank Info: 75 Cube 2x250wMH 14k. ACJR VORTECH TUNZE NANOS (IMBROKE)

09/27/2006, 03:34 PM	#852
ahchung Registered Member Join Date: Aug 2004 Location: HK Posts: 304	Can MJ-1000 be modified in this way? __________________ Explore the cheapest method to maintain SPS! Current Tank Info: 172L/45G SPS Tank

09/22/2006, 03:39 AM	#841
quangtam7 Registered Member Join Date: Aug 2003 Location: DFW Posts: 245	Here big 2.5" shroud I am planning to use on mj 1200 for super wide flow, the prop will be Octura Z55 (~2.2"). I think to make this prop work on 1200 without sacrifying the diameter I will need to reduce the pitch by trimming down the rear side of the blades (see pic of Dumas 3004), make it like an airplane prop, this of course will make the flow gentler. Stay tuned!

09/25/2006, 05:06 PM	#843
PVsPlayHouse Registered Member Join Date: Aug 2004 Location: NY Posts: 50	This is what happened to my MJ mod has this happen to anyone else? The impeller broke right through the back of the maxi Jet. It knocked off the backing of the MJ and cracked through the plastic holder that holds the Red and black bushing. I also cant find the o-Ring that came with the Mod is this needed? Im going to use my other MJ with this mod but before I do, has this happen before? what can I do to make sure it does not happen again. I got the large mod with a bigger Prop. I think it was the 1440 but not sure.

09/25/2006, 05:37 PM	#844
quangtam7 Registered Member Join Date: Aug 2003 Location: DFW Posts: 245	Do what I did in first picture, make the rod stick permanently, you won't need center brace.

09/26/2006, 10:47 AM	#847
miatawnt2b Registered Member Join Date: Jan 2001 Location: Tucson, AZ Posts: 1,467	I was worried about this exact thing happening. I noticed that the SS rod was spinning the other day. Either the rod is spinning in the black bushing, or the whole bushing is turning which would cause the failure mode you saw. I think it would be a good idea to epoxy the rod into the bushing, and epoxy the bushing into the MJ. Then figure out how long the slip washers mentioned earlier last, and use those between the magnet and the bushing replacing them before they wear away. I think the props are just too much backwards power and pressure for what the MJ was designed to do. -J

09/26/2006, 11:01 AM	#848
dhnguyen Moved On Join Date: May 2004 Location: Kingston, WA Posts: 4,751	Personally I have never experienced that problem with any of my mods. For the back nub to wear out and break like that it must have been a tremendous amount of force. I can see it being possible if you had perhaps dropped the MJ once or twice and caused a hairline crack in the back--just enough so to weaken the whole thing. IMO I don't think the backward force from the impeller/propeller is strong enough to break that by itself. The SS rod shouldn't be spinning at all. I would check to see if it's actually the SS rod or the end cap bushing is spinning. The bushing should fit the MJ pretty snugly and should not be spinning IMO. D.

09/26/2006, 03:54 PM	#850
dhnguyen Moved On Join Date: May 2004 Location: Kingston, WA Posts: 4,751	Either cut down the prop or use a smaller one. The best way to cut down a prop even IME is by attaching the prop to a drill and let it spin against some sandpaper. D.

09/28/2006, 08:57 AM	#855
RichConley Registered Member Join Date: Sep 2004 Location: Bostonian in Chicago going to DC Posts: 9,908	so you made it a fixed shaft, essentially? __________________ NO TANKS!!!

09/28/2006, 12:31 PM	#857
bklynmet Registered Member Join Date: Sep 2004 Location: Elkhart Posts: 527	dhnguyen ... the answer to my question is probably somewhere in this thread but figure I'd ask directly instead of hunting for it.. I plan on doing the mod on two MJ1200s for my tank and a fellow local reefer want to make one as well for his - so it'll be a good group build to do. What are the pros/cons of the drilled hole version for the shroud? Same question for the slotted version like on MJ Mods? I'm interested on the performance aspect - like if one has a great likliehood of causing the 'vortex' and sucking in air over the other design. I have a table saw and should be able to make a jig for the slotting option. Also have a drill with a variety of bits. So the 'manufaturing' aspect may not influence my decision as much as performance. Thanks in advance. __________________ PBITAWA!!! Removing skimmate, scraping algae, now changing a new set of baby diapers... will the crap ever end? Current Tank Info: 75g, 16g Lifereef sump w/ Lifereef VS2-24 mag 7 return, 6x54w T5, Separate 20g RR Oceanic w/ 10g Sump, Separate 4g office pico tank

09/28/2006, 12:52 PM	#858
dhnguyen Moved On Join Date: May 2004 Location: Kingston, WA Posts: 4,751	holes: pros - easy to do cons - cosmetically maybe although personally I don't think there is really any other than personal preference for the look. slots: pros - cosmetic cons - harder to do as they require some tools and a steady hand performance is the same on both

09/28/2006, 01:12 PM	#859
vanceny Registered Member Join Date: Apr 2003 Location: New York City Posts: 287	Guys, I'm trying to find the page where someone did a test regarding gph these things push. I have some disbelievers that need some kind of proof. thanks.

09/28/2006, 02:14 PM	#860
quangtam7 Registered Member Join Date: Aug 2003 Location: DFW Posts: 245	Short video clip http://video.google.com/videoplay?do...13810789461735