Author Topic: Flowkooler aluminum water pump  (Read 1267 times)

Roadie

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Flowkooler aluminum water pump
« on: May 28, 2018, 07:08:10 PM »
About 8 years ago, I put a flowkooler aluminum water pump in my Pontiac 400. I don't drive it much... It was on there for about 3000 miles. The impeller came apart where it meets the hub that attaches to the shaft. I replaced it with a GMB aluminum one with a cast iron impeller. I will never use another flowkooler product as long as I live.



« Last Edit: May 28, 2018, 07:11:57 PM by Roadie »

70RAIV455

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Re: Flowkooler aluminum water pump
« Reply #1 on: May 28, 2018, 07:34:57 PM »
Flowcooler used to be Top Notch.
It was one of the original High flow Pontiac V8 water pumps.

GMB pumps are made in China.
Good is did not fail.
Bad is it failed too.
Ugly is same or worse as today shown.

Roadie

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Re: Flowkooler aluminum water pump
« Reply #2 on: May 28, 2018, 08:20:46 PM »
I'd rather have a Chinese bearing fail than an impeller failure. The temp went from 180 to 260 within a 4 mile stretch between my guage checks. At least with a bearing failure, coolant is still flowing.

Roadie

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Re: Flowkooler aluminum water pump
« Reply #3 on: May 29, 2018, 08:31:03 AM »
GMB pumps are made in China.

Funny thing about those Flowkooler aluminum water pumps... They use GMB housings. lol

Mine has "GMB G28 1" casted into it. So does the image at Butler Performance.

https://butlerperformance.com/i-24452956-flowkooler-pontiac-11-bolt-1969-1-2-77-hi-volume-aluminum-water-pump-w-billet-aluminum-impeller-brw-1649.html



And they grind the numbers off before polishing their polished version:

https://www.ramairrestoration.com/pontiac/timing-covers-waterpumps-rela/awp-1p-high-flow-aluminum-water-pump-69-81-pontiac.html



So, when they buy their parts from GMB, do you really think they replace anything before pressing on their impellers?
« Last Edit: May 29, 2018, 08:34:30 AM by Roadie »

Roadie

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Re: Flowkooler aluminum water pump
« Reply #4 on: May 30, 2018, 08:50:04 PM »
Received my GMB one today. It is IDENTICAL to the flowkooler pump, down to the casting numbers, except the impeller. There goes the Chinese part argument...

Re: Flowkooler aluminum water pump
« Reply #4 on: May 30, 2018, 08:50:04 PM »

gstrandfarm9420

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Re: Flowkooler aluminum water pump
« Reply #5 on: May 30, 2018, 08:51:58 PM »
Did it significantly help the cooling (while it was working) ? Seems like stock Pontiac water pumps have been reliable but not overly efficient.

Roadie

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Re: Flowkooler aluminum water pump
« Reply #6 on: May 30, 2018, 08:58:34 PM »
I made sure to massage the plate to .025" away from the impeller before installing tonight and drove it for 30 miles in 90* ambient temperature. There was no difference in temperature from the flowkooler to the GMB according to the Holley Sniper logs (including cruising, several WOT runs, and 20 minutes of idling).

That said, I do run a 4 core aluminum radiator and electric fans. I never had a cooling issue with this setup.

Roadie

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Re: Flowkooler aluminum water pump
« Reply #7 on: May 30, 2018, 09:11:59 PM »
Setting the plate clearance to .025" is the most important thing with Pontiac water pumps. If that gap is too big, pump efficiency is lost due to water flowing back around the impeller... I think that is far more important than impeller design.

I have also read to stay away from stamped steel impellers, but I've never ran one to compare.

737driver

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Re: Flowkooler aluminum water pump
« Reply #8 on: May 30, 2018, 10:39:43 PM »
Stay away from stamped impellers. They do not work very well with Pontiac engines.
Jim
1979 Trans Am- Heritage Brown -W72 (Pontiac 400) -4Speed-WS6
1972 LeMans Convertible
1977 Trans Am
1972 Firebird
1971 Firebird
1970 Firebird
1977 MGB  Roadster Convertible

cyber104

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Re: Flowkooler aluminum water pump
« Reply #9 on: June 01, 2018, 09:39:35 AM »
I'm very surprised that happened - Flowkooler has a good reputation.

Did you call them to discuss?

Chris
1978 TA 4-Speed W72

Roadie

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Re: Flowkooler aluminum water pump
« Reply #10 on: June 01, 2018, 10:07:17 AM »
I contacted via web. No response. I'm not really interested in a replacement from them, so no biggie.

LeighP

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Re: Flowkooler aluminum water pump
« Reply #11 on: June 23, 2018, 05:14:58 AM »
Wow....thats no good.....  :shock:
Regards,
Leigh

Sydney, Australia
1968 Pontiac Firebird 428 5 speed coupe

Former Firebirds -
1969 Pontiac Firebird 400
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe


Re: Flowkooler aluminum water pump
« Reply #11 on: June 23, 2018, 05:14:58 AM »
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