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Rad fittings "define" the loop ID?

post #1 of 4
Thread Starter 
Most Thermochill rads have 3/8'' fittings.
Most Black Ice Xtreme rads have 1/4'' fitings.
Most Swifttech rads have 3/8'' fittings.

So, does the fitting of the rad define what ID for tubing is used? I mean, there are barbs that change the size (3/8 to 1/2), but if you use such barbs, won't there be significant drop pressure?
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post #2 of 4
Quote:
Originally Posted by Athanasios
Most Thermochill rads have 3/8'' fittings.
Most Black Ice Xtreme rads have 1/4'' fitings.
Most Swifttech rads have 3/8'' fittings.

So, does the fitting of the rad define what ID for tubing is used? I mean, there are barbs that change the size (3/8 to 1/2), but if you use such barbs, won't there be significant drop pressure?
The rad barb size is not the same as tubing I.D ...Rad barbs the part that screws into the rad,use pipe diameters..They would be G-1/4 or 3/8 npt or 1/4 npt..They are a lot larger diameter than tubing I.D. sizes..I beleive that the older BIX & BIP used a 9/16 pipe diameter, people say they flowed a little better..Alot of the manufacturers are changing over to G-1/4 fittings...The size changing or reducing barbs you spoke of will cause a bottle neck in your system..The part that might be confusing you is when they give you a number like G-1/4 x 1/2 O.D , The first is the screw in pipe size and the 1/2 O.D just means that the 1/2 O.D. would be fore 1/2 I.D. tubing..It can get a little confusing sometimes...Pump fittings are usally the same deal..
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post #3 of 4
Thread Starter 
Yep, im talking about NPT stuff or whatever. Rad fittings.

And this is why im asking, obviously there should be no changes in size throughout the loop. Im intending for 1/2'' barbs on all blocks/reservoir, but radiators are on 3/8 fittings, and you have to buy 3/8 to 1/2 barbs...
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post #4 of 4
Quote:
Originally Posted by Athanasios
Yep, im talking about NPT stuff or whatever. Rad fittings.

And this is why im asking, obviously there should be no changes in size throughout the loop. Im intending for 1/2'' barbs on all blocks/reservoir, but radiators are on 3/8 fittings, and you have to buy 3/8 to 1/2 barbs...
When you are looking at rad barb fittings the first number like say it's G-1/4 is the size of the part that screws into the radiator..So when they give you a number like G-1/4 x 1/2 O.D. the G-1/4 is the screw in part for the rad and the 1/2 O.D. means it is for 1/2 I.D. tubing...Don't worry about the pipe fitting size just make sure that it fits your rad it's not going to reduce your flow..I know it gets confusing and I may not be explaining it well..so if your are still confused I will be glad to help you out..Just ask...Hope this helps..
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