Low price water pumps.
09-10-2020, 11:16 AM
#16
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Maybe Nidec bought GPM as back then they were a small private company - http://www.gpm-pumps.de/contact/index.html
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
09-10-2020, 11:38 AM
#17
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On the most recent Laso, with the plastic impeller, just leaks and bearing failures (once the bearing gets "steam cleaned" by the seal leaking, failure from the grease being washed away doesn't take very long.) I wish they would identify the most recent version with some sort of external marking. Without this, I'm pretty much forced to remove and inspect any Laso I see, to make sure there is not one of the "early" versions with a metal impeller. And once it is off....is it worth the chance to re-install it, regardless of which version it is?
The good thing....I have not seen a plastic impeller come loose or fail. Have not seen the drive pulley come loose. They seem to have that figured out.
The good thing....I have not seen a plastic impeller come loose or fail. Have not seen the drive pulley come loose. They seem to have that figured out.
Last edited by Kevin in Atlanta; 09-10-2020 at 12:21 PM.
09-10-2020, 12:03 PM
#18
Posted this a while ago and wondering why the 928 water pump can't be replaced by an electric water pump?
From my quick review of the benefits over the conventionally driven water pump, and the possible catastrophic failures of the current design, no matter which manufacturer is used, it would be a great system to R&D going forward, no?
By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong.
Cheers.
From my quick review of the benefits over the conventionally driven water pump, and the possible catastrophic failures of the current design, no matter which manufacturer is used, it would be a great system to R&D going forward, no?
By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong.
Cheers.
09-10-2020, 12:48 PM
#19
Rennlist Member
Posted this a while ago and wondering why the 928 water pump can't be replaced by an electric water pump?
From my quick review of the benefits over the conventionally driven water pump, and the possible catastrophic failures of the current design, no matter which manufacturer is used, it would be a great system to R&D going forward, no?
By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong.
Cheers.
From my quick review of the benefits over the conventionally driven water pump, and the possible catastrophic failures of the current design, no matter which manufacturer is used, it would be a great system to R&D going forward, no?
By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong.
Cheers.
Constantine,
I looked into this about 5 years when my water pump threw the plastic impeller. The stock pump has to remain in place because of the cam belt and the bearing and seal have to be viable. The thermostat needs a couple of holes drilling in it and the electric pump would logically sit where the hose leaves the radiator bottom on its way back to the thermostat housing- no problem with my Spal twin fan set up but probably difficult with a stock shroud.
The electric pump I looked at was an Aussie built item - a Davies Craig EWP150 and the associated controller. My old water pump with the loose impeller would have been an ideal candidate. Because it is a custom built pump they can make them with a much greater efficiency and their documentation intimated they only need 10 amps to power the model referred- I found that a bit surprising but one can only take them at their word.
In the end I resorted to a stock water pump because of the complexities/time factor but it would be a neat little project to play around with.
Last edited by FredR; 09-10-2020 at 12:49 PM.
09-10-2020, 12:59 PM
#20
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"By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong."
Correct.
Kevin's water pump - 6 years and 60k miles - not perfect but reasonable. Sounds like the bearing in the cartridge was beginning to dry out = squeak.
No catastrophic failure and impeller still intact. No leakage either. I assume the impeller was still being driven by the belt and not seized? Kevin reported that water was not flowing from the head to the radiator which is normally a thermostat issue.
Correct.
Kevin's water pump - 6 years and 60k miles - not perfect but reasonable. Sounds like the bearing in the cartridge was beginning to dry out = squeak.
No catastrophic failure and impeller still intact. No leakage either. I assume the impeller was still being driven by the belt and not seized? Kevin reported that water was not flowing from the head to the radiator which is normally a thermostat issue.
09-10-2020, 01:28 PM
#21
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"By the way, Roger had put a lot of effort into this area years ago and, IIRC, actually was the driving force behind Laso accepting the idea of using a plastic impeller in their newer water pumps. Roger can correct me if I got that wrong."
Correct.
Kevin's water pump - 6 years and 60k miles - not perfect but reasonable. Sounds like the bearing in the cartridge was beginning to dry out = squeak.
No catastrophic failure and impeller still intact. No leakage either. I assume the impeller was still being driven by the belt and not seized? Kevin reported that water was not flowing from the head to the radiator which is normally a thermostat issue.
Correct.
Kevin's water pump - 6 years and 60k miles - not perfect but reasonable. Sounds like the bearing in the cartridge was beginning to dry out = squeak.
No catastrophic failure and impeller still intact. No leakage either. I assume the impeller was still being driven by the belt and not seized? Kevin reported that water was not flowing from the head to the radiator which is normally a thermostat issue.
Regardless of the bearing condition, a water pump with an intact drive pulley, an intact impeller, and an intact bearing shaft has to move water through the engine.
Something more going on, there.
That loud "clunk" when the pump is turned is unlike any bad bearing I've ever heard. I'd have dug deeper into that pump, to see what actually failed, for there to be no water flow.
09-10-2020, 01:54 PM
#22
Hi Fred,
Great to see you chime in! Yes, Davies Craig in Australia is the concern I also looked at superficially since they have done a lot of work in this area.
I understand that for a one off project in the middle of trying to get your 928 back on the road it was a daunting project, but as you speculated, it would be a neat project to work on at one's leisure.
Going back to hibernation mode so as not to get this thread too far off topic.
Oh and glad to see I remembered correctly with Roger's contribution to the 928 world with Laso plastic impellers.
Cheers.
Great to see you chime in! Yes, Davies Craig in Australia is the concern I also looked at superficially since they have done a lot of work in this area.
I understand that for a one off project in the middle of trying to get your 928 back on the road it was a daunting project, but as you speculated, it would be a neat project to work on at one's leisure.
Going back to hibernation mode so as not to get this thread too far off topic.
Oh and glad to see I remembered correctly with Roger's contribution to the 928 world with Laso plastic impellers.
Cheers.
09-10-2020, 03:08 PM
#23
Rennlist Member
Agreed.
Regardless of the bearing condition, a water pump with an intact drive pulley, an intact impeller, and an intact bearing shaft has to move water through the engine.
Something more going on, there.
That loud "clunk" when the pump is turned is unlike any bad bearing I've ever heard. I'd have dug deeper into that pump, to see what actually failed, for there to be no water flow.
Regardless of the bearing condition, a water pump with an intact drive pulley, an intact impeller, and an intact bearing shaft has to move water through the engine.
Something more going on, there.
That loud "clunk" when the pump is turned is unlike any bad bearing I've ever heard. I'd have dug deeper into that pump, to see what actually failed, for there to be no water flow.