Normal running temp 87+ cars
04-05-2009 | 10:54 PM
#32
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Joined: Dec 2003
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From: Atlanta, GA
Unfortunately, AutoPAC is the rebuilder for Porsche as well as several of the "Biggie" part suppliers on the list. This is the reason many of us participated in the various WP threads.
The general conclusion was that the quality (life) of the rebuilt WP is inversely proportional to the number of times it has been rebuilt.
The new Laso pumps seem to be what a lot of folks are using now. If they had a plastic impeller I'd jump on the bandwagon with both feet. But, at the moment, I'm on the fence with respect to a rebuilt with a plastic impeller and the Laso with the metal impeller. I'd love to have a rebuilt pump with a known high-quality. But, if the quality is unknown then I don't want the failure mode to be metal impeller "eats block."
I'm going to put a Laso in one of mine next and see how it does.
The general conclusion was that the quality (life) of the rebuilt WP is inversely proportional to the number of times it has been rebuilt.
The new Laso pumps seem to be what a lot of folks are using now. If they had a plastic impeller I'd jump on the bandwagon with both feet. But, at the moment, I'm on the fence with respect to a rebuilt with a plastic impeller and the Laso with the metal impeller. I'd love to have a rebuilt pump with a known high-quality. But, if the quality is unknown then I don't want the failure mode to be metal impeller "eats block."
I'm going to put a Laso in one of mine next and see how it does.
Dan
'91 928GT S/C
475hp/460lb.ft
04-06-2009 | 12:33 AM
#33
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From: Gone. On the Open Road
At least this has been my experience with about half-a-dozen failed pumps and corroborated by some other folks that R&R pumps.
Rebuilt pumps you get from PCNA are all plastic impeller pumps. The original factory-fitted pumps were metal impeller. I've always wondered if PAG knew something about rebuilt pumps...
My motto has been "plastic for the observant and metal for the blind."
Hopefully this will all become a moot point with the new Laso pumps.
04-06-2009 | 09:48 AM
#34
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Race Car
Joined: Dec 2003
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From: Atlanta, GA
Yes. But, that could be the case with either a metal or plastic impeller. OTOH, that catastrophic mode of pulley seizure is usually preceded by other less-catastrophic modes that let an observant owner know the pump is dying. In the case of the metal impeller pump, by the time it starts leaking you don't have a long time to catch it before it eats into the block. And sometimes it starts eating the block before it leaks. On the other hand, the plastic impeller pumps will, usually, under-rotate and cause high temps before they start leaking. If the owner doesn't notice that the car's running too hot then the eventual failure mode is engine death. For both types, a belt tracking to the edge of the left-side cam sprocket (relative to the right side) can also be an early warning sign.
At least this has been my experience with about half-a-dozen failed pumps and corroborated by some other folks that R&R pumps.
Rebuilt pumps you get from PCNA are all plastic impeller pumps. The original factory-fitted pumps were metal impeller. I've always wondered if PAG knew something about rebuilt pumps...
My motto has been "plastic for the observant and metal for the blind."
Hopefully this will all become a moot point with the new Laso pumps.
At least this has been my experience with about half-a-dozen failed pumps and corroborated by some other folks that R&R pumps.
Rebuilt pumps you get from PCNA are all plastic impeller pumps. The original factory-fitted pumps were metal impeller. I've always wondered if PAG knew something about rebuilt pumps...
My motto has been "plastic for the observant and metal for the blind."
Hopefully this will all become a moot point with the new Laso pumps.
Dan
'91 928GT S/C
475hp/460lb.ft
04-07-2009 | 11:52 AM
#37
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From: Northwest
So what's wrong with a Porsche waterpump...rebuilt in Germany...as my last one was (bought through Sunset in OR 3 years ago). Dunno if they still sell them...looked new to me.
I only want the best and this thread is pretty discouraging as it seems that we're all debating second bests...bad times.
H2
I only want the best and this thread is pretty discouraging as it seems that we're all debating second bests...bad times.
H2
04-07-2009 | 12:01 PM
#38
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Race Car
Joined: Dec 2003
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From: Atlanta, GA
Here is my experience. This is my third water pump replacement on a 928 in 10 years. Two times I have had a rebuilt pump fail by pissing coolant by the shaft. That's a 67% failure rate. This last one started to shave my timing belt and almost machined my block, and it's 5 years and 67k miles old. The previous one I did on my former '86 was only in there for 3 years and ~25k miles. That one just dumped coolant. So... I am never buying a rebuilt water pump again. I would rather pay more for a new pump that run the risk of at the very least doing the whole job again early, or at the worst replacing bent valves from a ruined timing belt.
My other (non-928) cars here have water pumps that are over 10 years old and have more than 100k miles on them that are still good. And these are cars that don't have a timing belt to get ruined when the pump fails. I'm done with bad quality 928 rebuilt water pumps.
Dan
'91 928GT S/C 475hp/460lb.ft
My other (non-928) cars here have water pumps that are over 10 years old and have more than 100k miles on them that are still good. And these are cars that don't have a timing belt to get ruined when the pump fails. I'm done with bad quality 928 rebuilt water pumps.
Dan
'91 928GT S/C
475hp/460lb.ft
