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Date:         Wed, 20 Feb 2008 00:11:40 -0500
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
Comments:     RFC822 error: <W> MESSAGE-ID field duplicated. Last occurrence
              was retained.
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Electric Water Pump
Comments: To: Kenneth Lewis <kdlewis@NORTHSTATE.NET>
In-Reply-To:  <64793.162.58.82.135.1203434125.squirrel@webmail.northstate.net>
Content-Type: text/plain; charset="iso-8859-1"

Water definitely erodes piping systems and other parts it moves through. Water jets can be used to cut steel and concrete. Cooling system erosion is a common source of failures. What do you think really happens to heater cores and often radiators? The erosion wears the tubes making them thin enough to leak. Automotive coolants can make things worse as part of the corrosion control package is abrasives. These abrasives are also what wears out the seal set. On the Vanagon, things are made worse as the engine is often working at some 4,000 rpm. The water pump is spinning almost twice as fast. No wonder those bearings often say no more. Using high mineral tap water also adds to the water wear problem.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Kenneth Lewis Sent: Tuesday, February 19, 2008 10:15 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: Electric Water Pump

Allan, It's a mystery to me how a fluid could erode the metal impeller. I stay on top of coolant changes so I don't think it was that. I have the distinct impression that failure rates did drop significantly when I switched from Italian to German made water pumps. Ken Lewis http://neksiwel.20m.com/

<snip> I have compared a new pump to an old >> one. The wear on the impeller blades is very evident . So an >> electric driven water pump might prove a healthy gain in FE (fuel >> economy). > > A worn impeller is caused by corrosion and/or cavitation. Neglecting > to change the coolant as specified is often a contributing factor, or > it could be poor quality materials in the manufacturing process. > > Allan > -- > 1991 Vanagon GL > >


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