Composite or metal water pump impellers?

[JFP in PA]

Originally Posted by itskenallen

What's your opinion on the thoughts of the metal impeller version having uprated bearings and therefore possibly outlasting the engine ?

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Somewhere south of zero..................ain't going to happen

[itskenallen]

Ok guys.. Thanks for all the advice. Ive contacted the supplier and they're sending me a Laso pump with plastic impellers.

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[san rensho]

Take your pick. WP bearing fails which is usually the failure made. When that happens with the Composite impeller the plastic breaks off and the pieces of plastic clog the very small coolant passages in the head leading to localised overheating and a cracked head.

Metal impeller? WP bearing fails and now the metal impeller chews a hole in the block that is not repairable. Motor is done.

I say just replace the plastic impeller WP every 5 ish years or so.

[itskenallen]

Originally Posted by san rensho

Take your pick. WP bearing fails which is usually the failure made. When that happens with the Composite impeller the plastic breaks off and the pieces of plastic clog the very small coolant passages in the head leading to localised overheating and a cracked head.

Metal impeller? WP bearing fails and now the metal impeller chews a hole in the block that is not repairable. Motor is done.

I say just replace the plastic impeller WP every 5 ish years or so.

Apparently it should be done earlier. Like every 3yrs or so. And time is as important as is mileage to water pump life

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