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Hi,
understand. But there are still some downsides on plastic impellers. And if you check the pump and play regularly i see more downsides for the plastic impeller, because you can't see inside if the impeller is deoriantating - which doesn't mean that the bearing has to be gone bad.
For a normal guy who doesn't check anything on his car or isn't willing to replace the pump preventively every 10 years or 100 TKm a plastic impeller pump will be the better choice.
For those who are interested in a metal impeller pump. GEBA is an after market manufacturer who is / was also OEM fpr Porsche. They offer a water pump with a metal molding impeller (not a cheap sheet metal impeller) for 986 / 996 cars. Part number is GEBA 15007. This pump is Made in Germany (not Turkey, Czech, Poland or elswhere in Europe) and uses high quality bearings from a well known german manufacturer.
Regards
Markus
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