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

[dhnguyen]

exactly carpe narem ! :lol:

 

[jrcastro]

Thought you guys would like to know I ordered some Octura props from the link above Prop Shop Inc. They we're great in prices & s/h was around $4 for priority mail.

1445 (1.77")D Pitch 2.478
2035 (1.38")D Pitch 2.760
2045 (1.77")D Pitch 3.540

All are 3/16 shaft hole.

Going to try them out & will keep you guys updated.

 

[Critter]

You should of told them you worked in the pump modification industry and if they could send a couple samples...

<a href=showthread.php?s=&postid=6816656#post6816656 target=_blank>Originally posted</a> by dhnguyen
No worries. I already called Octura directly and spoke to a very nice lady who is now sending out a full propeller catalog of all of their plastic propellers and an order form.

 

[Ball]

I ordered 3 Octura props.

1.38" - 1435
1.57" - 1440
1.77" - 1445

The 1440 and 1445 wouldnt start up under water. I think they are just to much prop for the motor. The 1.38" works good and puts out a lot of flow due to the pitch.

 

[dhnguyen]

<a href=showthread.php?s=&postid=6817809#post6817809 target=_blank>Originally posted</a> by Ball
I ordered 3 Octura props.

1.38" - 1435
1.57" - 1440
1.77" - 1445

The 1440 and 1445 wouldnt start up under water. I think they are just to much prop for the motor. The 1.38" works good and puts out a lot of flow due to the pitch.

Curious... Did the 1440 and 1445 start up under water wihtout the housing on?

If they do then maybe the housing can be worked on further to help.


D.

 

[jrcastro]

<a href=showthread.php?s=&postid=6817809#post6817809 target=_blank>Originally posted</a> by Ball
I ordered 3 Octura props.

1.38" - 1435
1.57" - 1440
1.77" - 1445

The 1440 and 1445 wouldnt start up under water. I think they are just to much prop for the motor. The 1.38" works good and puts out a lot of flow due to the pitch.

Thanks for sharing your experience with the other props.
I was able to change my order to the 1435-1.38" pitch is 1.932.

This seems to be the max combo for this mod.
How is the flow compared to the nitro 1.25" @ 1.65 pitch prop?
or the dumas 1.75" @ 1.50 pitch prop?

Are you using the MJ 1200 by the way?

Thanks

 

[Ball]

I tried all 3 impellors underwater with no housing. They start up just fine out of water. If I slowly lower the spinning prop in the water, they stop by the time they get 100% sumberged. Of course, there is some serious spray going on while lowering them in the water.

I thought I may try a couple other 1200's, just in case there was some variation in the motor strength. I would have liked to see wha the 1.57" and 1.77" prop could have done.

 

[jdieck]

<a href=showthread.php?s=&postid=6817809#post6817809 target=_blank>Originally posted</a> by Ball
I The 1440 and 1445 wouldnt start up under water. I think they are just to much prop for the motor.

That brings a good point. As I read this thread I found that in the most part the drive has been to increase flow but see little on the side of powerhead load.
Running at the specified load will help reduce heat transferred to the water, extend the useful life of the pump and most importantly to reduce the risk of cracking the epoxi used to encapsulate and insulate the stator windings.
Of course a lower pitch ratio prop will reduce the load but if reduced too much, the flow will be afected.
If you are interested in knowing the load and test for different configurations to optimize the load, measuring the load is rather simple if you can get your hands on an AC Amp meter to measure the AC current taken by the pump.
The maxijet 1200 is rated for a current of 170 to 190 milliampere (Arond 20 watts) and the Maxijet 900 is rated for a current of 65 to 75 milliampere.

 

[jrcastro]

<a href=showthread.php?s=&postid=6819060#post6819060 target=_blank>Originally posted</a> by Ball
I tried all 3 impellors underwater with no housing. They start up just fine out of water. If I slowly lower the spinning prop in the water, they stop by the time they get 100% sumberged. Of course, there is some serious spray going on while lowering them in the water.

I thought I may try a couple other 1200's, just in case there was some variation in the motor strength. I would have liked to see wha the 1.57" and 1.77" prop could have done.

I thought the 1.38" - 1435 worked for you under water.

 

[Ball]

<a href=showthread.php?s=&postid=6819334#post6819334 target=_blank>Originally posted</a> by jrcastro
I thought the 1.38" - 1435 worked for you under water.

The 1.38 does. Sorry for the confusion.

 

[crypto]

the problem with some of the big or higher pitch props is that they wont spin fast enough. if they are spinning too slowly, then when the magnet switches (AC current) it has a chance of reversing direction because the prop hasn't spun far enough during a 1/2 cycle.

the reason they spin slow is going to be a combination of just pushing all that water and then friction caused by the backward pressure of the prop shaft / magnet against the powerhead housing.

for instance, i can't get a 1.75" dumas to be stable on my seio 620 but a pair of nitro's is fine. when the big prop is working, it put's out a lot more water.

 

[crypto]

here's a pic of what i have so far on my seio 620. i hated the original since it would always stop and never start, so i figured i might put some props on it. haven't finished the rest of the housing yet.

 

[jrcastro]

<a href=showthread.php?s=&postid=6819486#post6819486 target=_blank>Originally posted</a> by crypto
here's a pic of what i have so far on my seio 620. i hated the original since it would always stop and never start, so i figured i might put some props on it. haven't finished the rest of the housing yet.

So you put the nitros on a seio 620?
If so, hows the flow compared to the original seio impeller?
is is like the MJ1200 with the dual nitros?

 

[crypto]

besides the fact that the seio now works, i'd say it's a lot better than the original 620. granted, i still need to put some type of housing or screen over it.

i would say it is comparable to my mj600 with dual nitros. i prefer the mj since it is smaller.

 

[crypto]

Here's the magnet assembly for the Seio.

I had to cut off the impeller with a dremel. I used the .098 CF rod as a shaft and then the 0.157 CF tube as a bearing and for the prop shaft. the 0.157 tube has the be sanded down a bit to slide into the magnet. you can't drill out the ceramic (at least it's not worth the effort).

 

[dhnguyen]

Hey crypto,

Couldn't you reuse the existing SEIO housing for it?

 

[crypto]

some of it can be used, the cross brace for instance.

the props wont fit inside unless i drill out a lot of plastic, i;m thninking about doing that though. 1 1/2 slip fitting fit the seio fairly well, so that's an option.

 

[dhnguyen]

yeah now that I looked at the SEIO housing more, those inlet slots looked rather skimpy. probably not even enough to draw enough water for the kind of flow we want.

D.

 

[TA]

<a href=showthread.php?s=&postid=6820356#post6820356 target=_blank>Originally posted</a> by dhnguyen
yeah now that I looked at the SEIO housing more, those inlet slots looked rather skimpy. probably not even enough to draw enough water for the kind of flow we want.

D.

I have two sieos 1100's and also noticed how small those inlet slots are. Do you think opening up some of those slots will increase the flow of the sieo? I'd bet they're very constrictive. (sorry for being a bit off-topic )

btw...working on a maxi-stream 1200 and 900 mod as wee speak...so I've been following for a while...great thread.

 

[crypto]

i used a hole saw and cut out the innards of the seio and removed some of the inlet slots. the housing seems stable. everything fits inside.

the flow with 2 nitros inside the housing didnt work at all, so i tried a 1 3/4 dumas cut down to about 1 1/2 and it works a lot better than the standard seio. actually quite impressive but i think the intake is still an issue.

the tiny prop is to stop the spin if it is reverse.