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stamped impeller -- more than you wanted to hear 200

uid 27's pic
posted by  Art Benstein on  Fri Oct 17 07:06 CST 2014
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last visit: Fri Oct 17 20:10 CST 2014
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Hi yourself SB,

Must point out that I did not say it WAS a more efficient design, but that it LOOKS like one. Weasel words from an admitted neophyte student of hydronics.

Generally speaking, all of engineering is trade-off. One trades longevity for economy, efficiency for reliability, material strength for weight -- depending on the marketplace. Are the components destined for space travel? Are they one-use throw-away? Why did a government-spec'd claw hammer cost us $7K?

You see, I had this previous experience with an Airtex water pump early in my affair with Volvos. This one did not move enough water at idle to circulate the coolant through the head. Cast vs. cast. Well, it appears to me the water-pushing surface area is part of the efficiency of any centrifugal pump. You might choose the pump on the left if it ran 3000 rpm, but my idle was around 600.



Replacing the brand new Airtex on the left with the Hepu on the right solved a problem. The problem was overheating when idling. If you buy a Volvo pump, it has a stamped impeller, but given the car is out of production 20 years, I doubt that choice had anything to do with "efficiency."
--
Art Benstein near Baltimore

"Often people who have lived with uncomfortable heating systems do not realize what they have been missing." -- John Siegenthaler






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