Water Pump Speed

Apr 14, 2018 4:22 PM - 747 Views Create A New Thread

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Pickerington, OH

Water Pump Speed
I'd like to slow my water pump down a little. With that tall gear, and 70MPH, that engine is really crankin. I have a walker rtadiator, and it cools nice, just I may be able to increase radiator performance a little in the dead of summer If I can slow the water pump down a little. The radiator flows like crazy, even at idle, and I have already taken the high-volume pump off (Chevy 350).

So, If I change only the water pump pully, do I want a bigger pully, or a smaller pully?


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  • GeneF
    Apr 15, 2018 at 3:12 PM

  • Thanks. I bet those are just the ticket. And I can put them in, and fine tune it with just opening the petcock, and two bolts. I live in Columbus, Ohio, so I can just stop over at Jegs on lunch break and get a set.

  • will547
    Apr 14, 2018 at 10:59 PM

  • The bigger the pulley the slower the pump will run. The smaller the pulley the faster the pump will turn.

  • will547
    Apr 14, 2018 at 10:58 PM

  • Gene, Not sure about reducing the water pump speed but I do have a old friend who installed AC systems in Street Rods and muscle cars for years. He would sometimes install washers under the water neck restricting/slowing down the water flow through the system to improve cooling. He did that many times with great success. Moroso Water Outlet Restrictor Kits 63440

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