Water pumps. Which one would you buy?
03-30-2007, 09:53 AM
#11
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I bought a new, unopened Delco water pump last month, #12482919/GM #251-545 (stamped # on the actual pump housing is 12564115) and the blades look similar to those on the pump on the left.
Did someone rip me off?
Did someone rip me off?
03-30-2007, 10:27 AM
#12
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I like the machined gasket surface on the right one. 
I'd buy one just for that, then I'd set it on my desk at work and admire it all day. ...where'* my wallet?...
I'd buy one just for that, then I'd set it on my desk at work and admire it all day. ...where'* my wallet?...
04-03-2007, 03:52 AM
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Originally Posted by willwren
It would seem AC Delco went through a re-design.
I remember years ago (in 96?) I had trouble finding one. Some of the aftermarket ones that NAPA was selling back then had the impellers mounted on the shaft crooked and were rubbing the casing. I had to open several boxes before I found a good one.
04-03-2007, 06:53 PM
#16
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Willwren
Does the pump on the right have a solid cast iron impeller?
On my old 1970 cutlass swapping from a stamped to a cast impeller dropped idle temp a solid 5*.
Does the pump on the right have a solid cast iron impeller?
On my old 1970 cutlass swapping from a stamped to a cast impeller dropped idle temp a solid 5*.
04-03-2007, 07:28 PM
#17
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It is solid cast. And the measured/roughly calculated surface area of the impeller blades is quite a bit more. This pump will flow about 15-20% more than the Chinese pump pictured at the beginning of this topic, and the old OEM that I removed last night.
04-03-2007, 07:36 PM
#19
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Not basing this on angle, nor have I accurately measured the diameter. Hard to say until I get to a more quantitative analytical anal retentive analysis.