Composite or metal water pump impellers?

[itskenallen]

Originally Posted by JayG

Uh, Pelican is not a mechanic, they are a parts vendor

Get a Pierburg WP. Its the same as a a factory one, but less $$

Um... What?
Pelican do some of the best maintenance and diy guides available today. Wayne Dempsey is a genius and well knows the Porsche engines.

I respect JFP's advice but the reason I'm asking the question is that Nick @Pelican parts says on the 986 guide that he prefers the plastic impellers, yet on the 997 guide he recommends using the metal impeller version. My father has a 997 and is replacing his also, hence how we came across this.

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[JFP in PA]

Originally Posted by itskenallen

Um... What?
Pelican do some of the best maintenance and diy guides available today.

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I'm afraid I cannot agree with those statements.

[itskenallen]

Originally Posted by JFP in PA

I'm afraid I cannot agree with those statements.

Fair enough. Thanks for your info above.
I've seen mixed recommendations, that's why I created the thread... To get opinions of experts.

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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[dghii]

Originally Posted by itskenallen

Fair enough. Thanks for your info above.
I've seen mixed recommendations, that's why I created the thread... To get opinions of experts.

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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That kind of a statement from a vendor is pure BS sales crap. How do they know how long an engine may last? What information do they provide about their uprated bearing?

Besides you didn't want this WP to begin with. Get the one you wanted and you'll be good to go.

Heck, saying "my water pump will outlast the engine" on our cars may not necessarily be that much a statement!

[78F350]

Originally Posted by 78F350

I'll be scrapping the engine that this pump came out of, or selling it cheap to someone who wants to part it or rebuild. Pieces of the composite impeller are somewhere in the engine and not coming out. Driven hard, it dumps coolant, then overheats (The cooling system has been replaced/tested).

Metal or composite? I don't care. Replace them about every 3 years and they should be fine. Wait 'till a failure and you can get bad results with either.

Pierburg makes good pumps, so does Geba, most forum members who are into this stuff will recommend the Pierburg.

By the time it makes noise or leaks it may have already shed plastic impeller debris that can end up in the cylinder heads.. While the majority of the failures that we see with cracked heads come from the 2000-01 engines we have seen this happen to engines as late a 2006. No matter mileage we change water pumps every 3 years, whether or not the engine is running the plastic impeller blades are exposed to coolant.

The metal impeller blades may not fail, BUT if you have a pump bearing failure the impeller "machines" the aluminum housing away and destroys the engine. Water pumps are cheap and easy to replace.
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Jake Raby
Flat 6 Innovations
Inventor of the IMS Solution:
US Patents 8,992,089 & 9,416,697

https://rennlist.com/forums/996-forum/666866-update-thoughts-on-preventative-water-pump-replacement-79k-my-03-a.html#post9051269

http://986forum.com/forums/boxster-general-discussions/60817-use-gt3-water-pump-metal-impeller-2.html

[itskenallen]

Originally Posted by 78F350

I'll be scrapping the engine that this pump came out of, or selling it cheap to someone who wants to part it or rebuild. Pieces of the composite impeller are somewhere in the engine and not coming out. Driven hard, it dumps coolant, then overheats (The cooling system has been replaced/tested).

Metal or composite? I don't care. Replace them about every 3 years and they should be fine. Wait 'till a failure and you can get bad results with either.

Pierburg makes good pumps, so does Geba, most forum members who are into this stuff will recommend the Pierburg.


https://rennlist.com/forums/996-forum/666866-update-thoughts-on-preventative-water-pump-replacement-79k-my-03-a.html#post9051269

http://986forum.com/forums/boxster-general-discussions/60817-use-gt3-water-pump-metal-impeller-2.html

Thanks for this.. Some good info there.

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[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