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Old 04-28-2013, 06:14 PM
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Chevy water pump, what is best

High flow pumps for street rod. Flowkooler vs Stewart Components.
Both say they are the best. Any comments or experiance with these water pumps?

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Old 04-28-2013, 07:36 PM
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I'd look into alternative coolant routing before you worry about a fancy pump.
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Old 04-29-2013, 04:29 AM
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I've been using a Stewart stage 1 for quite a while and it works well. However, it wasn't much more expensive than a stock pump, so I figured any improvement it gave would be good. Once you move to their higher rate pumps the price goes up quite a bit.

I'm using the Stewart stage 1, high flow 195 degree thermostat, three row radiator stock radiator, Hayden severe duty fan clutch, and 7 blade OEM steel fan. It works extremely well in slow traffic or while idling. If I run my AC in really hot weather (95-100 degrees) I can see the difference in temps, but it still tops out at about 215-220 degrees while idling with AC on.

Bruce
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Old 04-29-2013, 09:50 AM
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This is a 32 ford with a 4 inch chopped radiator. The customer says it is hot all the time. I am taking off the short blade mechanical fan and puting on a 14 inch puller electric fan and am thinking of a better pump since It it right in front of me.
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Old 04-29-2013, 10:41 AM
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I`m assuming he has a shroud on the rad, if not, thats about 70% percent of his troubles...?
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Old 04-29-2013, 11:15 AM
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Quote:
Originally Posted by 65ELCMO View Post
This is a 32 ford with a 4 inch chopped radiator. The customer says it is hot all the time. I am taking off the short blade mechanical fan and puting on a 14 inch puller electric fan and am thinking of a better pump since It it right in front of me.
Cooling system problems can be as frustrating as any problem you may encounter.
I recall years ago, chasing a cooling problem until I was pulling my hair out, only to find eventually that the pump impeller was spinning on the driveshaft. Ever since then, I have grabbed the impeller with one hand and twisted the driveshaft with the other hand to insure the impeller is tight on the shaft when installing a water pump.

Years ago, I started this wiki tutorial concerned with finding and fixing cooling problems. Since then, another 10 members have included their own expertise and so I'm thinkin' that this may be the finest cooling system tutorial on the web. Read through it several times and you may find some pearl of wisdom that will help you to find the problem with the customer's ride. I sure as hell would not be replacing a belt-driven system with some fosdick electric fan system that moves less air.
http://www.crankshaftcoalition.com/w...cooling_system
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Old 04-29-2013, 11:38 AM
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Quote:
Originally Posted by 65ELCMO View Post
High flow pumps for street rod. Flowkooler vs Stewart Components.
Both say they are the best. Any comments or experience with these water pumps?
Either one will work. Often, it is the thin, flat plate that is affixed to the back of the impeller that makes them work better than off-the-shelf stock pumps.
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Old 05-01-2013, 04:04 AM
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Usually high performance water pumps are plated. By that I mean the impeller has a plate attached to it. It makes it more of a "water wheel". That way as the coolant comes into it, the coolant is picked up in the folds between the impeller and plate.
A stock pump without the plate on the impeller allows the coolant to be scattered around inside the pump housing. It works but with a plate the coolant gets more directed.
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Old 05-06-2013, 09:42 AM
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Originally Posted by 65ELCMO View Post
High flow pumps for street rod. Flowkooler vs Stewart Components.
Both say they are the best. Any comments or experiance with these water pumps?
I've got an Edlebrock aluminum pump, long style, not polished on my shop/daily driver truck with 110,000 miles on the pump.

Bogie

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Old 05-06-2013, 11:07 AM
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Use a Stewart or Edelbrock pump if you need a new one; or buy the plate that poprivets to the impeller from Stewart and install it in the pump you have now. Use a shroud and clutched fan if you can fit one in there (I recommend Hayden or AC Delco - get one for a Nova or a Vega as they seem to really squish them in tight)
Know that a 'HD or Severe Duty clutch requires a different pitch to the fan blades. Here is a description from Hayden of types of fan clutches.
Hayden - Fan Clutches and Fan Blades
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Old 05-06-2013, 01:59 PM
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I'm glad that Autogear mentioned fan blade pitch. I'll bet there's not one rodder in a hundred who has ever even thought about the pitch on his fan blade. Finding the pitch is as easy as laying the fan down on a counter and using a ruler to measure from the counter surface to the tallest part of the fan blade. A 2"/2 1/2" pitch would be nominal for a belt-driven fan blade. Need more pitch to pass more air? Look at the Olds diesel fan from '78 to '85. That thing has such a deep pitch that it could create a hurricane. I believe the pitch was about 3". On the flip side, measure any of the aftermarket fans, including those cheezy flex fans. I doubt if you'll find more than an inch of pitch.
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Old 07-20-2013, 04:08 PM
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I just found the article you guys did on cooling - Awesome.

Duane
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