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Originally Posted by ibmkg
To your c) I would 'slightly' disagree. I am a car enthusiast as well. In free time I modify car (the ones that I own) for ultra performance. Modern engines do not run cool enough (though way cooler than older ones). But with a beefy turbo you can melt the block.
I have also water cooled my intercooler (rad). I am telling this as to make you understand the extent of performance mod.
Copper rad tends to get hotter and hotter with conventional cooling method (air) not cooling it fast enough. Al shows a dramatic change since as soon as cooling starts (air starts to flow) rad gets cool. Compare it to Cu, Al requires less air to cool down.
I agree that Al would not be as effective to cool the air from turbo as compared to Cu but to cool down Cu itself one needs better cooling methods.
You can try this be heating a piece of Al and Cu with same amount of heat for a period of time. Al will cool down much faster than Cu when left in open air.
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You are not wrong here entirely. Copper does dissipate heat faster though. However what you are saying is not wrong about needed a better cooling method. Copper will hold a lot more heat than aluminum so there is a lot more heat in the copper to cool. This is why many think copper doesn't dissipate heat faster. It does there is just a lot more to dissipate.
Another reason aluminum is used for cars is weight reduction.