Originally Posted by Sir Diesel
Ok let's see if I have this right. All of my water blocks are threaded with G1/4 female. Does this mean I shouldn't waste my money on hose sizes larger than 1/4 inch?
It's does make sense as the 1/4 water block would be the choke point.
Yes and no. Whilst you are right that the ID of the G1/4 thread is the choke point long runs of smaller diameter tubing also creates restriction. You would get higher flow rates with larger tube sizes regardless of the fact that the flow still has to go through the same size thread ID. The only time where this isn't true is if you maxed out the flow through the choke point, which happens as you get to the speed of sound in the medium at that point - not going to happen here.However
, having said that the restriction of the tubing is negligible compared to the restriction of the blocks in the loop, so different size tubing isn't going to make a difference.
Cathar (I think?) did an experiment a while ago where he showed that there was effectively no difference in temperatures between 3/8" to 1/2" ID tubing.
Other than looks and minor cost differences thicker walled tubing is more resistant to kinking, smaller diameter tubing can turn tighter bends.Tl:Dr
- Tubing size makes no difference to performance, pick based on personal preference.
Edit: Cathar's performance impact calculations on XSEdited by GingerJohn - 10/30/13 at 10:35am