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Originally Posted by JamesAvery22
Yeah with the double pass the water is going through the same surface area and the water going through each tube will be faster but you are talking double the restriction of a single pass HC, maybe even more. I dont have any #s to back any of this up but I'd guess the flow rate loss would negate and gains you get from higher velocity in the tubs of the HC :shrug: .
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I've a 2-342 and BillA tested it vs a dual pass of same overall size.
Pressure drop of the single pass core was 70% lower for the single pass core. It's been a while, I don't recall for sure what the dual pass core model was, but was of about the same size.
So the added velocity does come at a cost. And with a low pressure pump that would tip the balance towards the lower head loss rad.
With a high pressure pump it would be better to use the dual pass for best cooling.