E46Fanatics - View Single Post - why is the BMW coolant system the way it is?
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Old 10-04-2012, 03:42 PM   #23
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Originally Posted by TerraPhantm View Post
Nonetheless, it seems a bit counterintuitive to make something that is required to withstand high pressures for years out of plastic. I think the fact that mishimoto managed to make an aluminum radiator/expansion tank combination is proof that there were alternative options
It is not that plastic is a bad material. It is that the plastic they chose turned out to be a bad material. Plastics/composites can be incredibly strong and durable. Anyway, the problem with the pump is the bearing anyway, isn't it? I don't hear much of the impeller disintegrating.
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