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Old 02-17-2012, 04:58 PM   #1
MrJ
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High Flow Water Pump - yes / no ?

I'm taking out the radiator. I'm leaning towards installing a high flow water pump. Probably this one.

Tuff Stuff Performance 1461NC - Tuff Stuff Supercool Water Pumps - Overview - SummitRacing.com


I plan to install a high-flow thermostat as well. This one. (don't know the temp yet)

Mr. Gasket 4365 - Mr. Gasket High Performance Thermostats - Application - SummitRacing.com


So, is this a bad idea or should I put a normal flow water pump back on? I've read the hoses can collapse and other bad issues with a high flow pump. I've also read that some RVs come with high flow pumps. (doubt in '76 they did)..


Thoughts Recommendations?
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Old 02-17-2012, 05:12 PM   #2
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There is no real reason for anything other than the OEM stuff, good quality of course, such as GM put on to begin with. Your money will be better spent on taking the radiator out, having it professionally cleaned inside and out, new hoses and belts, and a good fan clutch. Bringing the cooling system back to original condition is better than band aids to a system which needs basic service. (assuming it may need basic service).

My opinion, of course. (ex Argosy 28' MH, ex AS 310 MH, ex GMC MH)
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Old 02-18-2012, 09:36 AM   #3
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I'm going to replace all those things as well. I don't plan to use the high flow water pump as a fix. It would be more of an upgrade. I've read many posts going both ways on this issue.

Can anyone suggest a good brand of water pump to purchase? I'm not putting in Autozone parts if I can help it. The high flow pump is only $17 more than the Autozone OEM pump.

Radiator is trash. I'm going to have it re-cored. Belts will be new. Rebuilding or replacing the power steering unit. Replacing the fan clutch. New Alternator as well. Don't know type yet.
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Old 02-28-2012, 09:15 AM   #4
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I can not speak of this specific application. In some cases a high flow pump can actually decrease cooling capacity and create hot spots by introducing turbulant flow. In the professional world they are usually used with other cooling system modifications after some design and engineering. It's worth some reasearch.

Ask yourself, "why didn't GM put in a higher flow pump". Its definitly not a cost issue.

Or, it might be an improvement to a design inadequacy. But they built a whole bunch of those engines in a lot of applications...

My opinion comes from years of watching people chase their tails on cooling issues with high performance applications. Many of the problems are resolved by proper radiator/fan shrouding.
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Old 02-28-2012, 01:56 PM   #5
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Also keep in mind that it take power to pump water. More flow = more power. I recall that some of the high flow pumps draw as much as 3 hp at speed. An A/C compressor draws about 5 to 10 hp for comparison. Just some considerations...
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Old 02-28-2012, 02:11 PM   #6
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Seem to recall something about this many years ago. A neighbor was "accessorizing" his hobby car. Afterwards, the engine was running hot at highway speeds. Turns out the problem was the high flow water pump he installed. The theory was that the coolant was running through the radiator so fast it wasn't losing enough heat. He went back to the stock pump and it then cooled properly.
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Old 02-28-2012, 04:03 PM   #7
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Quote:
Originally Posted by Silver Goose View Post
The theory was that the coolant was running through the radiator so fast it wasn't losing enough heat. He went back to the stock pump and it then cooled properly.
I think the actual mechanism is turbulent flow through the core of the radiator that lowers the efficiency. Think of a bunch of little circular eddy currents along the walls of the radiator tubes that keep the main flow through the center unable to give up its heat.
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Old 02-29-2012, 12:07 AM   #8
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thanks for the help guys. I will let everyone know how it turns out.
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