Water pumps. Which one would you buy? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-28-2007, 01:34 AM   #1
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Default Water pumps. Which one would you buy?

Ignore the rust on the left. That'* 6 months new stored in my garage.

Left pump was $26. Right pump was $29.

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Left is NEW. Stamped "GMB Japan" on the housing and shaft.
Right is NEW. AC Delco. Rock Auto was the vendor.

You be the judge.
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Old 03-28-2007, 01:39 AM   #2
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I installed a pump like the left and it failed again within a week. Started makin' bad noise.

I say Delco... I assume it would have a warranty?
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Old 03-28-2007, 01:44 AM   #3
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Christ, that thing looks like it'd be pretty rough, probably a lot of cavitation as well.
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Old 03-28-2007, 01:48 AM   #4
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Let me complicate this for you.

I run a 10% underdrive water pump pulley on the Zilla. Kinda makes the choice a bit easier, doesn't it?
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Old 03-28-2007, 02:00 AM   #5
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Haven't we had suspicion that our WP cavitate at higher speeds anyways? Would a 10% underdrive help cooling @ high speeds given the system is in top notch spec otherwise?
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Old 03-28-2007, 06:20 AM   #6
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Right side. The increased length of the impellor blades will increase flow, The curvature of the blades will reduce cavitation, and the peice is cast versus stamped.
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Old 03-28-2007, 08:27 AM   #7
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Undrive pulley will cause the pump to turn slower.
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Old 03-28-2007, 08:34 AM   #8
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Quote:
Originally Posted by BonneMeMN
Haven't we had suspicion that our WP cavitate at higher speeds anyways? Would a 10% underdrive help cooling @ high speeds given the system is in top notch spec otherwise?
10% was way too agressive for any car even remotely considered a streetable car. I had to make a major step in thermostats to run it (heavily drilled 160). And I had no cooling issues whatsoever before then. 5% would have been better.

The point being, you get what you pay for. The water pumps pictured here are a good example of what 3 bucks more will do for you.
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Old 03-29-2007, 03:57 AM   #9
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the one on the right looks like the one i would use.
the shaft is also flush with the center of the blades , and blades looks like it will better coolant flow..........
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Old 03-30-2007, 03:36 AM   #10
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So did our cars roll off the line with the right one?
Its been too many years and water pumps ago for me to remember accurately, but I think I would noticed this difference back then.
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