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5/8" fittings vs 1/2"

post #1 of 17
Thread Starter 
Still on my quest for improving flow rate, I decided to visit my local Big-R today and to my suprise they carried WAY more stuff that Home Depot.

I even found these little 5/8" fitting gems. I wasn't sure if 1/2" tubing would fit over them, but I decide to buy them anyway. Once I got home I tried it out...not only does 1/2" go over them, my 7/16"ID5/8"OD tygon 3603 also fits and that with just normal pressure, no special heating or anything.

In addition I see that the 3/8"NPT (Threaded) to 1/2" fittings have a nasty step on the inside and these 5/8" fittings are smooth all the way through.

I also measure the ID of the fitting and found that

1/2" Barbs ID = 3/8"+ or maybe 13/32"

5/8" Barbs ID = 7/16"+ or mabye 15/32"

So 5/8" fittings should be quite a bit less restrictive, not only in size, but they don't have a step on the inside like the typical 1/2 barbs do.

Here are the pics:


7/16" ID Tygon fits no problem:


Check out the free flowing 5/8" left and step down 1/2" right:


5/8" barb ID measured:


1/2" barb ID measured:


Anyhow, probably not going to make some miraculous difference, but why use 1/2" ID tubing and 3/8" ID fittings?

Every little bit counts, and if you're already buying the fittings, might as well go big
    
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post #2 of 17
Hey every little bit helps...A 1/2" fittings ID is around 7/16" and you are more or less bottle-necked by the smallest ID in your loop...That will have to help some...Thats what WC'ing is all about "Optimizing"...All those little 1 or 2C tricks can make the difference between a good rig and a killer rig....
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post #3 of 17
nice, exactly what im looking for!!hmm now i got to find them here in Canada lol, how much were they btw?was there a T fitting like that as well?
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post #4 of 17
Remember that your entire system would have to be 5/8, any smaller OD fitting in the loop will be the bottleneck.
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post #5 of 17
Thread Starter 
Quote:
Originally Posted by Apollo4g View Post
nice, exactly what im looking for!!hmm now i got to find them here in Canada lol, how much were they btw?was there a T fitting like that as well?
Yes, they have all sorts of 5/8" fittings I also picked up a T fitting while I was at it. At my Big-R, the barbs were $0.69/ea and the T was $0.99.

I think any reduction is restriction over the loop is a good thing, it's all about loss of energy and you still loose energy in fittings that have sudden steps in size compared to the tubing size...granted not much compared to the losses in the blocks or radiator, but every little bit helps. As the water flows around a loop it continues to loose pressure until it returns to the pump and pressure is restored.

I have four of these barbs for my two radiators and a T fitting I can clean up. I'll still have 4 more water block barbs I can't do much with, but that's ok. If I was anal enough I could take those block apart and round off any sharp edges and cut off any portion of the barbs that protrude beyond the threaded block.
    
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post #6 of 17
Quote:
Originally Posted by Martinm210 View Post
Yes, they have all sorts of 5/8" fittings I also picked up a T fitting while I was at it. At my Big-R, the barbs were $0.69/ea and the T was $0.99.

I think any reduction is restriction over the loop is a good thing, it's all about loss of energy and you still loose energy in fittings that have sudden steps in size compared to the tubing size...granted not much compared to the losses in the blocks or radiator, but every little bit helps.

I have four of these barbs for my two radiators and a T fitting I can clean up. I'll still have 4 more water block barbs I can't do much with, but that's ok. If I was anal enough I could take those block apart and round off any sharp edges and cut off any portion of the barbs that protrude beyond the threaded block.
VERY NICE! exactly what im looking for...
can you take a pic of the T fitting?

oops nevermind saw it lol

BTW can you get these in G 1/4 Fittings ??
for my 480GTX
what fittings is that res you have there?
ALSO WHAT SEALENT DID YOU USE THERE?
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by Apollo4g View Post
BTW can you get these in G 1/4 Fittings ??
for my 480GTX
what fittings is that res you have there?
ALSO WHAT SEALENT DID YOU USE THERE?
Not sure on the G 1/4, I can take a look, but most everything I saw was these 3/8" NPT or larger types.

This is the res I have (no longer being used) It has 3/8" NPT fittings
http://www.sidewindercomputers.com/cosibayre.html

For sealant, I just used some Permatex ultra copper High Temp RTV silicone. It doesn't stick all that well to nylon, but I like using it better than tape., so far no problems and it also worked for my o-ringed barbs. You just have to be careful to clean it out really well if removing a barb later, you don't want little bits make there way into your loop/pump.
    
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post #8 of 17
yup thats the same rez i have....oh going T line i see?
hmmm could you take a look for me
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post #9 of 17
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Sure, I can swing by tomorrow.

That's 1/4" BSPP to barb, and you're looking for something larger than the typical 1/2" right?
    
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post #10 of 17
Quote:
Originally Posted by Martinm210 View Post
Sure, I can swing by tomorrow.

That's 1/4" BSPP to barb, and you're looking for something larger than the typical 1/2" right?
yup just like you have there in your pics, attaching them to my res, and looking for those G1/4 for my 480GTX rad. and that big T fitting, anything larger than those normal ones from DD that you have compared to in that pic, i got the exact same from DD, and i dont like how small they are
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