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Originally Posted by krazy
Ignoring heat of the pump and all other variables being constant, does directing the pump into the blocks before the radiator really have any advantage over going through the radiator first and then the blocks?
The system is a closed loop, so changing the order can't get faster flow through the blocks or anything, so where does this often discussed better performance come from? Is it simply from the heat of the pump being sent to the block sinstead of the radiator first?
I've been contemplating the ordering of the loop in the system I'm designing right now, and this still eludes me.
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Going to the blocks first does at best nothing for temps, at worst you increase temps with pump heat. As you say, in a closed loop the flow rate is the same in all parts, thus putting the block before or after that radiator makes no difference at all to the flow through the block. The whole weak pumps should pump into the block first theory is a myth.