another water pump mod? - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 09-19-2018, 11:14 AM Thread Starter
 
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another water pump mod?

Hey guys - I am doing some work on cooling. Replacing the water pump and radiator. I am aware of the mod to tighten up the space between the back divider plate and the impeller, but I read about another mod that I wanted to get your opinion on too. My understanding is that the middle divider plate is best positioned directly in the middle of the impeller, as I understand it, so flowing water can be equally proportioned on either side of the divider, which then goes to the left and right side of the block. I took out my pump and this middle divider was flush to the impeller. So I am wondering if I modify the middle plate to sit at middle of the impeller I would be doing myself a favor. Have you guys heard of this? agree or not?
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post #2 of 13 (permalink) Old 09-19-2018, 11:20 AM Thread Starter
 
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forgot to say its the 8 bolt water pump...
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post #3 of 13 (permalink) Old 09-19-2018, 12:27 PM
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That plate is supposed to just touch the impeller without the gasket so it sounds like yours has the proper clearance.
My car set up like this with a 195 thermostat runs at 195 and as high as 210 if I really romp on it but comes back down rather quickly to 195 when I cruise it.
I have tried different thermostats but my engine runs best at 195.
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post #4 of 13 (permalink) Old 09-19-2018, 10:09 PM Thread Starter
 
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Thanks gr. Are you referring to the back divider?

I was looking at both dividers again and it does seem to make sense that the middle plate should straddle the impeller to split the flow to each hole into the block....
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post #5 of 13 (permalink) Old 09-19-2018, 11:07 PM
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There should be just two plates, front and back.
Support the pump casting on a couple of blocks and peen the front plate until it barely touches the impeller.
Put the gasket on then the plate and spin it, if it doesn't touch you are there.
Too far back and the coolant cavitates decreasing the flow.
Back plate should be flat.
Mine had the back plate missing so I bought a repop set made of stainless.
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post #6 of 13 (permalink) Old 09-20-2018, 06:59 PM
 
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Garage
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Originally Posted by MidnightAuto View Post
Thanks gr. Are you referring to the back divider?

I was looking at both dividers again and it does seem to make sense that the middle plate should straddle the impeller to split the flow to each hole into the block....
You would be correct. Mine is set up exactly like that. Very perceptive
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post #7 of 13 (permalink) Old 09-20-2018, 09:32 PM Thread Starter
 
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Cool. I just got it back in the car. Will finish this weekend and report how it goes. New cold case radiator, flowkooler pump with the divider mods, and 160 Tstat. I am expecting the car to make ice cubes when itís all said and done. Only thing left is electric fan but was not ready to give up clutch fan yet.
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post #8 of 13 (permalink) Old 09-20-2018, 10:45 PM
 
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no need to give up clutch fan, as long as your clutch is working right it will cool as good as the electric and i suspect with the 160 TS and correct mods it will stick at 175 on the worst days, mine does. Also a correctly sized and mounted fan shroud is a must, fan blades centered to the edge of the shroud.

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post #9 of 13 (permalink) Old 09-21-2018, 04:22 AM
 
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any pics of this 2nd divider plate? Thought I only had one on mine............
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post #10 of 13 (permalink) Old 09-21-2018, 05:57 AM
 
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Yes, I would like to see a pic of that also, if possible. Thanks.
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