Does it matter if I use different sized tubing in the same system?

Dennyd1

Honorable
May 21, 2013
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10,510
I'm building a liquid cooled system, and I was going to go with 1/4" inner diameter tubing and compression fittings wherever possible.

However, my pump comes with non-detachable 1/2" barb fittings, which means the tube going to the pump and going away from the pump has to be 1/2".

Am I going to mess anything up if I use 1/4" tubing for everything else in the system?

Update:
Okay, good, that's actually what I was thinking about doing. Routing the output towards the radiator, and routing the input from the reservoir which will be setting just above the pump with a very short tube.

Question:
Would it be better just to get 1/2" inner diameter tubing for everything?

Update again:
I decided to get 1/2" tubing for everything.

Smaller tubes allow for more room, but I decided to err on the side of performance rather than space. I can do whatever I need to in order to ensure the tubes don't kink.
 

everlost

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Mar 8, 2013
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different sized tubing will affect liquid flow rates. however, only if you are splitting the flow between 2 different sizes.

using 1/2 between pump and rad or res will have little effect on your system.