The "Hitchhiker's Guide" to the Maxi-Stream mod - Page 5

dhnguyen · #**101** 12/06/2005, 03:58 PM

Greg,

No the 1 3/4" prop will not fit into a 1 1/2" PVC pipe. You will need to find a 1 3/4" PVC pipe (if you can find one) to fit one. I have only seen 2" PVC pipes around but never 1 3/4"

If you're going to use the 2" pipe though, you will need to come up with some way to fit that onto the MJ body as 2" would be way to large

dhnguyen · #**102** 12/06/2005, 03:59 PM

By the way the ID of the 1 1/2" SCH40 PVC pipe is actually 1 5/8" slightly larger than what they are classified as.

dhnguyen · #**103** 12/06/2005, 04:08 PM

Also I finally found some SCH40 gray PVC pipes at Home Depot. Theye were on the electrical aisle.

The colour is a quite a bit lighter than the MJ but at least it's not glaringly white anymore

D.

GSerg2 · #**104** 12/06/2005, 05:12 PM

Here are some interesting props. The ones at the bottom are racing props. The GR231742 at the very bottom looks kind of like the one on the new Icecap pump.

http://www.hobby-lobby.com/grboatprop.htm

dhnguyen · #**105** 12/06/2005, 05:21 PM

Don't forget to drill out the metal inserts in those if you choose to use them. Wouldn't want them to rust or worse contaminate your tank.

D.

GSerg2 · #**106** 12/06/2005, 05:24 PM

I think that last one is all plastic (at least the pic looks that way) but I could be wrong. Thanks for the heads up.

Urabggr · #**107** 12/06/2005, 08:09 PM

I got the carbon fiber rod from towerhobbies.com and I've noticed that its very very very slightly larger than the actual rod that comes with the mazijet and doesn't go in as smoothly. Is this a bad thing? Also, on my mj1200 with a 1.25" prop, how long should I cut the pvc pipe/ carbon fiber rod. Basicall,y how big should that housing be? Thanks!

GSerg2 · #**108** 12/06/2005, 08:54 PM

Here are a couple of pics of mine. About the only change I made was to the cross brace. I made a flat one first and noticed the flow was disrupted quite a bit by it (could be mine was too wide). So I made a second one with a thin brace and streamlined it. I tried to shape it after an airplane wing so the water would slip around it. It seemed to make a big difference. Now I still gotta figure out that mount...

dhnguyen · #**109** 12/06/2005, 10:17 PM

Very nice Greg. Clean cuts on the slots too

want2reef · #**110** 12/06/2005, 11:24 PM

Has anybody painted the PVC to match the MJ?

Kevin

dhnguyen · #**111** 12/06/2005, 11:59 PM

I painted one black using Krylon Fusion. But I didn't like the glossy look so much so I chucked it.

Instead I found some SCH40 gray PVC pipes at Home Depot's electrical section and will be using those instead on my next batch

tleip · #**112** 12/07/2005, 12:42 AM

Sorry for no photos, but I'll try and explain what I did --

I had an old MJ impeller 'cover' and found that with the output 'spout' cut off, it fits INSIDE the threaded end of a 1.5" MALE thread x slip adaptor, almost like a slip fitting, if that makes sense. I cut the top off from the cover and wound up with something almost like the test cap. Since the ID of the slip end is 1.9" (because it goes on the outside of the 1.5" pipe), I was able to fit a 1.75" prop inside. Otherwise just like the regular build. I first tried with a MJ900, but it would run for a bit and then just stutter back and forth.

Hope this makes some sense at all, this is a great concept you guys started, I hope we can get it to the next level w/something bigger. I priced the Tunze units and they are really pricey! Great mod you guys!

Terry

GSerg2 · #**113** 12/07/2005, 09:06 AM

I see what you mean about using the original impeller cover. So you did use two props? Would love to see pics if you get a chance.

Cuervo420 · #**114** 12/07/2005, 02:05 PM

Hey tleip! Great to know you've had success with the original impeller cover. I don't have access to a miter saw to make the groove. And I just called the 6th and last local plumbing supply store looking for a pvc test cap with no luck. I found them online but don't want to pay shipping. think you could get a pic or 2?

hersh007 · #**115** 12/07/2005, 02:10 PM

what sort of adhesive did you use to attach the pipe to the original cover?

GSerg2 · #**116** 12/07/2005, 03:09 PM

>> just called the 6th and last local plumbing supply
>> store looking for a pvc test cap

You've got to be kidding. Wow, do you have a Home Depot or Lowes? Both of those have them here. Some people call them a pvc knock-out.

tleip · #**117** 12/07/2005, 08:21 PM

sorry, my camera is on the blink -- I used a dremel to cut of the output-spout and cut off the top of the cover sort of like was done with the test cap by dhnguyen. I used some ABS pipe cement to glue it to the PVC fitting and it has worked so far (it was what I had laying around, so not sure it is the best for the job, but it did work.

I found the test caps with the ABS pipe, not with the PVC at my home depot if that helps anyone

HTH,

T

anutha newby · #**118** 12/08/2005, 12:31 PM

nice thread! quick question, how do you disassemble the impellor? do you just pull the end caps off with pliers? any tricks or suggestions (before I bust it!) does the impellor come off easily? TIA

anutha newby · #**119** 12/08/2005, 12:31 PM

nice thread! quick question, how do you disassemble the impellor? do you just pull the end caps off with pliers? any tricks or suggestions (before I bust it!) does the impellor come off easily? TIA

dhnguyen · #**120** 12/08/2005, 01:15 PM

exactly. With pliers and carefully not to damage them

anutha newby · #**121** 12/08/2005, 02:58 PM

propah, I've ordered the props etc, just need to collect the remaining doo-dads, I have the mj's now just need to find the time, oy.. thanks again, i'll try to post pix when i'm done, could be next year....

anutha newby · #**122** 12/08/2005, 02:58 PM

propah, I've ordered the props etc, just need to collect the remaining doo-dads, I have the mj's now just need to find the time, oy.. thanks again, i'll try to post pix when i'm done, could be next year....

anutha newby · #**123** 12/08/2005, 03:04 PM

one last question. when using a wave maker, the pump comes on and can spin the opposite (wrong) way, in reverse we'll say. the props push away from the motor housing and hit the Stopper. when it hits the stopper, does the prop automatically just stop and spin the other (right) way? when it hits the stopper, is it loud enough to "bug" you?

wondering if in the long run, maybe this mod should not be used on a wave maker. any thoughts?

hersh007 · #**124** 12/09/2005, 07:28 AM

I was thinking about the wavetimer issue too, the DIY $6 timer that is in this section seems like it would be a reasonable candidate for waves (30 sec intervals) but anything shorter would probably severely impair the propeller's life.

What do those of you with the stop in place think?

Cuervo420 · #**125** 12/10/2005, 03:02 PM

Quote:

Originally posted by GSerg2
>> just called the 6th and last local plumbing supply
>> store looking for a pvc test cap

You've got to be kidding. Wow, do you have a Home Depot or Lowes? Both of those have them here. Some people call them a pvc knock-out.

Both actually. The manager of the plumbing dept. at HD said that "although this is a very common item, i can't stock unless there is a distinct market for it" ...guess no on within a 60mi. radius ever has a need for a knock out plug / test cap