DIY Eheim 1260 brush impeller

no venturi and the sedra 5000 nw all I did was take some RO tubing and slide it at and angel kind of what spazz did on his skimmer
 
So has anyone tried hooking up an air pump to any of these pumps???? Anyone have any idea how much air they will actually handle???
 
mchava,

What were you using to measure airflow? If you really are getting these airflow numbers, it might be worth my while to buy a eheim 1260 to try this mod. :) After all, if you could have the performance of a 300 dollar H&S pump for around $180 if you DIY, it might be worth my while.

Peace,
John H.
 
It's strange that the venturi would actually limit airflow in this case.

MDboyz,

Looking at the Sedra 9000 NW I have here, it looks pretty much the same as the sedra 5000. Needle arrangment is exactly the same and I really can't judge size very well, if you want to take a measurement of the diameter. I'll take a measurement tomorrow and I'll tell you wide the impeller is.

Peace,
John H.
 
John, I still have a 5000 and 9000 n/w in my toy box (bucket) (they may have been yours at one time). If you know of a meter at a decent price- Please let me know, I will order it today!! I would be glad to share it.. I would like to check out a few skimmers at LFS also ;)
 
<a href=showthread.php?s=&postid=7769816#post7769816 target=_blank>Originally posted</a> by rufio173
It's strange that the venturi would actually limit airflow in this case.

MDboyz,

Looking at the Sedra 9000 NW I have here, it looks pretty much the same as the sedra 5000. Needle arrangment is exactly the same and I really can't judge size very well, if you want to take a measurement of the diameter. I'll take a measurement tomorrow and I'll tell you wide the impeller is.

Peace,
John H.
Click to expand...


See, I dont think its strange that the venturi would limit airflow.

Venturis were designed to have water pushed through them at high velocity, and that will suck in air. Putting them before NW pumps is a hack, and nothing more. Centrifugal pumps dont handle restrictions on the intake well, and thats what you're doing. Restricting the intake.

You probably get a higher air/water ratio with the venturi, but the non venturi set up is moving way more water, and probably sucking in more air.
 
One of my first play toy pumps was a OR 3700 (from John H. ) It had no venturi, so I simply placed an air line into the suction side of the pump.. Rich, IMHO, it did suck more air and moved more water without venturi.. :) (but that setup was not r/c)
 
Oh, yeh. Right now I am feeding my skimmer with a gen-x 2400. I tried it without the venturi -- (IMHO) much finer and more bubbles. But it moved so much more water- it was too turbulant. Had to put ventri on it to slow water flow. I am eyeing the gen-x 1500 or maybe a 3500 sedra as a feed pump. Wish ehiem would get that new pump out..
 
RichConley,

I partially agree with your statement, but with my testing, the sedra 9000 venturi was about 3-4 SCFH better than just sticking an angled tube into the inlet side of pump with gate valve controlling water flow, so I feel that with properly designed venturis matched to the pump, then the NW pump will draw more air than using tubes pushed into the inlet side.

The venturis placed on the output side are generally much more restrictive than the ones they put on the inlet side and of course IMO opinion are much more expensive and designed better, but then again, the ability to make small bubbles by venturi is not the goal for these "inlet venturis". The key is that they wish to draw as much air into the NW as possible without cavitating it. I still want to see if the OR 3700 can draw even more air if I were to use the H&S style venturi. Once again, with a properly designed venturi specifically fitted for your skimmer pump, I feel that will yield the best results, sadly this doesn't occur since all skimmer manufacturer's seem to use their same generic venturi on all their pumps.

Peace,
John H.
 
Charlie,

I actually have an extra air meter that you are free to borrow at anytime. Just let me know. (It's just sitting there since I don't have a second pump yet for my skimmer)

The one problem is that I'll be heading out of town tomorrow early in the morning to Jersey. :)

Peace,
John H.
 
Charlie,

I'm sure you can go straight to Dwyer's website and purchase from their. I received mine from Brent of www.barraquatic.com.

He made the mount and everything for me. Just let me know when you would like to meet today. :) Maybe you can bring my snails.

Peace,
John
 
<a href=showthread.php?s=&postid=7771144#post7771144 target=_blank>Originally posted</a> by rufio173
RichConley,

I partially agree with your statement, but with my testing, the sedra 9000 venturi was about 3-4 SCFH better than just sticking an angled tube into the inlet side of pump with gate valve controlling water flow, so I feel that with properly designed venturis matched to the pump, then the NW pump will draw more air than using tubes pushed into the inlet side.
Click to expand...


I'm sure it was, but thats not what I'm talking about. You're still restricting the input, which is not what we want here.

yes, with a properly designed 'venturi', it will probably draw more air, but I really dont believe the venturis used by NW manufacturers are anything close to properly designed.
 
It may not work well in this DIY setup, but there is a reason that all skimmer manufacturer's use a venturi on the inlet rather than just sticking an angled tube in the inlet of the skimmer and that is to increase airflow into the skimmer.

It's simple bernoulli's principle. If properly designed and suited for a pump, a venturi will be far more effective than just stuffing a tube into the skimmer's inlet. That's my story and I'm sticking to it. ;)

Peace,
John H.
 
rufio173 iam also using the Dwyer RMA-22. I need to get it back from my friend who is also testing his skimmer. Once I get it back I will take a picture of it working
 
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