Quote:
Originally Posted by JFP in PA
They both can block critical small passages, leading to hot spots. The major difference between the two is the permanent case damage metal impellers can do, which leads to cooling problems even after everything is cleaned out. Clean out the plastic, install a new pump, and it is as though nothing happened.
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Considered this aspect.
Problem is that the plastic parts in general are much bigger than the metal parts. OK, thin metal parts could affect the bearings of a new water pump. Big plastic parts can block thin water lines. And as we all know there is not only clear fluid in this lines. Over the years we get some corrosion and other dirt - even it's an aluminium block (and there is also aluminium corrosion).
Still on the metal impeller side.
Regards, Markus