As pretty as the BMW pump may be they still suck and fail with alarming regularity.
4 Grand Master
As pretty as the BMW pump may be they still suck and fail with alarming regularity.
"The gas pedal wouldn't go to the floor if it weren't meant to be there"
As ugly as that cast impeller looks, I would not doubt it may pump with more efficiency. Smooth, pretty surfaces don't mean better pumping, in fact rough surface might be better. I would be more concerned about the bearing and seals and I'd rather have the metal impeller than the plastic one since the reason they fail is because they are plastic.
EDIT: whats up with this forum? I can barely follow most threads. This note just got stuck in a weird place. Not to be a whiner, but is someone on top of this problem?
Pat Washburn
Wausau, WI
1995 525iT
The BMW impeller is metal NOT plastic. It is so well cast it has that plastic look to it. I do know that turbulance from not having a smooth impellers does not make it bump better.
Scott
"I'm all in favor of keeping dangerous weapons out of the hands of fools. Let's start with typewriters."
- Frank Lloyd Wright (1868-1959)
I thought all BMW water pump impellers were plastic, one of the ways they shave weight and make the engine more efficient?
Hence why it's a maintenance item. The price we pay for a high performance engine.
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