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Are 90 degree Elbows OK?

post #1 of 24
Thread Starter 
I know any kind of right angle turn will slow the flow down, but I was thinking that a water block is worse than a right angle turn and we have those in our loop. If I added one or two elbows do you think it will hurt my cooling? I'm redoing my loop on Tuesday when I get my new block and some more tubing. An elbow, actually two would be ideal for my case, but I don't want to add them if it's going to kill my flow rate.
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post #2 of 24
It will slow down the flow and should be avoided unless required.

1 or 2 probably won't hurt much.
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post #3 of 24
Thread Starter 
If I can put one in it will help me get rid of a 3 tube intersection in the middle of my case that will look like crap.
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post #4 of 24
I've played with Martin's spreadsheet and the elbows don't hurt the flow as much as I was lead to believe. Check for yourself: http://www.martinsliquidlab.com/Mart...Estimator.html

They still make a difference, and really with that tool around there's no reason not to use it when considering adding anything to a loop.
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post #5 of 24
Yeah you want to stay away from 90's if at all possible, they are just to restrictive and will really knock down your velocity...You can usually use a little longer tubing to the block and avoid using any...If you do absolutely have to use something like that go for a pluming sweep instead, they are like a 45 degree transition, much better then a 90 but still go for no fitting if you can at all....
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post #6 of 24
Thread Starter 
I was just thinking of one of these.

Who has pluming sweeps?
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post #7 of 24
Those are very restrictive.

I think something like this is what ira was getting at:



You can get those in copper w/o the flanges as shown, but that kind of shows you what to look for. Any hardware store that carries plumbing stuff will have them.
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post #8 of 24
If you do not want to go with that I would suggest a DD actel 90 its less restrictive compared to a regular elbow even though expensive you will be paying for quality and its $8 at petras
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post #9 of 24
These are probably the next best thing to copper 1/2" elbows, sweeps would be even better, but the copper elbow is extrely low restriction also. We're talking like no more than 4" of tubing...so very very low restriction.

These 3/4" brass elbows have a nicely machined radius on the interior. I think they are the best thing you can buy commercially that comes with hosebarb ends. A little oversized, but easily done by stretching the tubing with some plyers before hand:

http://www.pexsupply.com/categories....D=546&brandid=



You can find these fairly redily at alot of home improvement stores if you look for them. 3/4" brass elbow...

I would avoid the nylon types if you can. It's not alot of pressure drop compared to a waterblock, but it can be avoided...so you might as well avoid it...
    
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post #10 of 24
^^ i'm with Martin on the 3/4" elbows if you can fit your tubing over them

i have one in each of my loops just because the way i have things mounted i can't fit things otherwise.
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