Punisher, I've heard a lot of people suggest that idea. However, it is flawed, as you are still not moving any more heat.
The water flowing fast through the block will pick up a small amount of energy per unit volume. Conversley the water flowing through the radiator will give out a large amount of energy per unit volume.
So that makes it better right?
Wrong, because you are moving many more unit volumes of water through the block, each picking up a small amount of energy, and it adds up.
I think what people are trying to envisagewhen they say fast through the block and slow through the rad is,
a. cold water into the block to maximise the temp difference between core/block and coolant.
b. lots of time in the rad so as to get rid of all the heat.
The best way to do this is to have either a wide radiator so it moves slowly through the rad, or a long radiator, so it moves at the same speed just in there for longer. Both of these mean having a bigger radiator. That's the only way of having each unit volume of water spend more time in the radiator for each unit of energy it picks up from the block.
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