Water Pump Differences
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Senior User
Joined: Nov 2001
Posts: 200
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From: Virginia
Water Pump Differences
Anyone out there know what is the difference between GMB's regular and high performance water pumps? I want to see if the difference is really worth $30. It looks like the current water pump is original (as it should be with 30K miles), and the shaft wobbles when it runs (though it doesn't leak yet). I want to replace it before there's any real problem (or catastrophic failure).
I haven't had any major cooling problems but the gauge reads a little high. I'll probably add a mechanical gauge to see if it is truly high.
Thanks,
Mark
I haven't had any major cooling problems but the gauge reads a little high. I'll probably add a mechanical gauge to see if it is truly high.
Thanks,
Mark
Cargo Master
Joined: Aug 2000
Posts: 2,931
Likes: 12
From: SW Michigan
Water Pump Differences
Mark, who is GMB ? Usually the pump to get is the one intended for an air conditioned truck. Some of the pumps have a bigger impellor than others, but I think you get the big one if you ask for the A/C model. And how warm is the engine now ? A mechanical gauge would be a good idea. You want to run at about 205-215*. Don't fall for the myth that a 'cooler running engine' is a good thing. DF
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Senior User
Joined: Nov 2001
Posts: 200
Likes: 0
From: Virginia
Water Pump Differences
GMB is just an aftermarket waterpump maker. They have a "high performance" pump that sells at Advance for less than $70. Someday I might shell out for the aluminum edelbrock pump, but for now I think the regular pump will meet my needs fine. The parts places seem to list the same pump for AC and non-AC applications.
I think I just need to get a decent set of gauges. My dash is mostly idiot lights so it isn't much use. Of course the temp gauge is not calibrated (just T E M P) so I really don't have a good idea where it is running.
Thanks for your comments.
Mark
I think I just need to get a decent set of gauges. My dash is mostly idiot lights so it isn't much use. Of course the temp gauge is not calibrated (just T E M P) so I really don't have a good idea where it is running.
Thanks for your comments.
Mark
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Water Pump Differences
I read in one of the performance books that there are two pumps, and only the very early ones where 'low' flow types and all the newer (mid/late 60's on) were high flow.
The A/C trucks use a different pully system, this causes the pump to spin faster. I converted a 73 F250 from non AC to AC and got all the pullies from an AC truck and they are different sizes.
I ended up getting the Edelbrock Alum pump, but if you want more flow you can get the AC pullies and/or get a backing plate from www.jegs.com for about $10 that it welded to the back of the stock impeller inside the pump.
The A/C trucks use a different pully system, this causes the pump to spin faster. I converted a 73 F250 from non AC to AC and got all the pullies from an AC truck and they are different sizes.
I ended up getting the Edelbrock Alum pump, but if you want more flow you can get the AC pullies and/or get a backing plate from www.jegs.com for about $10 that it welded to the back of the stock impeller inside the pump.
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