Omni-Jet
- Thread starter omnicron
- Start date
G1sammons
Bronze Member
ahhh I though maybe he was out of town of something
omnicron
Bronze Member
- Thread starter
- #43
Got the jet done...I'm pleased over all on how it turned out. I welded it up myself so I didn't bother my bud, littlenugget1. Be kind...
I calculated the pressure chamber and figured that with it larger then my supply I would loose some (energy?) so I shrank it so the water entering not have to expand so much. I hope to test it some time soon...
Without further ado...
Questions?
Comments?
I calculated the pressure chamber and figured that with it larger then my supply I would loose some (energy?) so I shrank it so the water entering not have to expand so much. I hope to test it some time soon...
Without further ado...
Questions?
Comments?
G1sammons
Bronze Member
Looks good omni
G1sammons
Bronze Member
If ya have too many jet tube for your pump setup just plug a few up ! Cork them
Timberdoodle
Sr. Member
Looks good from the pic's Omni. Housing size looks appropriate to deliver the volume to the jets. Did you end up installing baffles in the chamber like you mentioned to counter the rotational force or are you going to just try it first?
Another potential thing to check is the angle of the jets when running under pressure. Since the tubes are cut at a angle to match the jet housing, the jet stream angle may increase slightly. You could check the depth of the expected point of impact using the dowels with a tape measure from the front of the jet. Once running at pressure with the front of the jet out of the water you can check again with a tape measure to see if they are meeting at the same point. The length of the tube may counter the bending effect of the jet orifice, so I wouldn't expect too much change, but I haven't cut a tube like this to check. Just a thought.
Again, can't wait to hear testing results. Great job and great posts Omni!
Another potential thing to check is the angle of the jets when running under pressure. Since the tubes are cut at a angle to match the jet housing, the jet stream angle may increase slightly. You could check the depth of the expected point of impact using the dowels with a tape measure from the front of the jet. Once running at pressure with the front of the jet out of the water you can check again with a tape measure to see if they are meeting at the same point. The length of the tube may counter the bending effect of the jet orifice, so I wouldn't expect too much change, but I haven't cut a tube like this to check. Just a thought.
Again, can't wait to hear testing results. Great job and great posts Omni!
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omnicron
Bronze Member
- Thread starter
- #49
Thanks Timber. I did use dowels to check the alignment and they all meet in the middle or with in 1/8 of a inch. I did install small curved scoops and tilted them forward slightly to help catch water and direct it into the tubes. I'm hopeful that it's all going to work as planed! Over all it was actually fairly easy to make with the hardest part being the initial first few post here 
lol. Na the hardest was the tube alignment. I'm going to try to figure out how to test this as my buddy uses cam locks and I'm using slip connections.
lol. Na the hardest was the tube alignment. I'm going to try to figure out how to test this as my buddy uses cam locks and I'm using slip connections.Timberdoodle
Sr. Member
Hopefully you have a tractor supply around, I believe they carry 2" camlocks in stock. A short piece of hose connection and your in business. The angle change I mentioned is just something to keep in the back of your mind when testing, the cut angle in the tube will result in pressure differences as the water exits the tube and can potentially result in a natural bend in the jet stream as pressure will try and equalize forcing the jet stream inward. This is something I noticed working on angled orifice's, whether it applies to a length of tube which has more directional force I have not tested but I would expect some bending to occur.
omnicron
Bronze Member
- Thread starter
- #51
Cam locks are common here its just they are not in my budget at this time...Till I sell my 4", I'm not buying any more parts which sucks cause I still need my pumps, hoses and other parts to be able to finish. I still have lots to do that I do have the pieces and parts for. Now it's just getting the time with a new born waanabe dredger around! 
principedeleon
Sr. Member
- Oct 22, 2013
- 449
- 151
Where did you installed the scoops ? Im rebuilding my 4" flare and jet . Im making it all into one piece. I plan on making a jet similar to yours. Ima just not going to use 1/2" tubes and its going to have 4 exits instead of 8 1/2" exits . I think kinda like the dahlke tri-jets. Just 4 instead.
russau
Gold Member
everytime i try to use camlocks on any material lines, i get rock jams. they are ok for the water supply!i like the slip fir for my maretial lines!!
principedeleon
Sr. Member
- Oct 22, 2013
- 449
- 151
I thought the scoops was for when water enters the pipe and spins ; it kinda diverts the water into the 1/2" pipes. I dont know if that will work but its what i thought. Also how big does the outer pipe haves to be . I bought a piece of 6" but i calculated wrong and i need more clearing. .
Is a 8" pipe over the 4" too much.. Is hard to find a 7". .
Is a 8" pipe over the 4" too much.. Is hard to find a 7". .
Last edited:
littlenugget1
Full Member
All you need is 2" on the out side of the 4" all the way around.
omnicron
Bronze Member
- Thread starter
- #58
The scoops are for the tubes, they are down stream on the tailing edge. IE: Right on the edge of the hole/pipe. IF you do a pressure chamber you need to think about what the water is going to do, IF you over size the chamber you'll lose some pressure/efficiency what ever. To small and your going to kill flow/efficiency. It's a balancing act.
Hoser John
Gold Member
Looking good now go play man. Wish I was there but got me sum sum a that pretty yeller stuff,got all my annual labor done to roads and stashed equipment from the rain-WE GOT RAIN NOW YAHOO. Will clean up nasty filthy nuggets and post 33+ grams-dirt hahaha. Dowels trick worked-GREAT-as you want that center spot for equalibrium in pushing force in the middle of the jet as they all feed off of one anothers thrust. Your jet will last much longer than a single or double jet as not using the steel side a the jet anymore and now sand will not eat a hole through the side. These jets are a pain to fab but some folks love cadillacs over Yugos. It really matters when your dredge season is 1,000+ hours a year. Weekend warriors not much at all really as gas savings add up and more gold recovery over a long hard season then it adds up to quite a bit a cash-pays for gas/beer anyhow. TONS A AU 2 U 2-John
bill-costa rica
Sr. Member
used those on a friends 8 inch worked great. first you need to chuck it up on a lathe and open up the inside to 8 inches, then you have no problems your restrition is gone. bill/cr
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