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Originally Posted by Les
Check out the difference between the MCW6002-A and the MCW6000-A
Maybe it is relevant there.
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Interesting observation Les.
I am trying to stay out of this, being a "low-flow" advocate because it's more practical in my case, not for performance reasons. The suggestion that smaller tubes could be beneficial at a given flowrate is appealing.
I ran a system with a windscreen/headlight washer pump for six months almost continuosly using copper brake lines. I.D 2mm. Radiator and pump outside through the winter with coolant as low as -20C. Excellent performance as far as I could tell at that time, if you don't count noise in the equation. When the pump, oddly enough, burned up, the performance drop with a more conventional centrifugal pump and summer temperatures was strangely dramatic.
The point being, limitations to performance can be compensated for in other ways, Making the whole argument a little moot.
In an SSF case a 6mm I.D. system could easily outperform an otherwise identical 1/2" I.D. system simply due to airflow restriction.
All other things being equal, high flow can't not beat a low flow system. It's an end, not a means and not really what the debate should be about.