Few questions on radiator tube size

Heating / Cooling / AC

  1. 71DodgeDemon340

    71DodgeDemon340 FABO Gold Member FABO Gold Member

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    Hey guys, so i will have to replace my leaking milodon water pump and figured while the coolant was all out it i was thinking of swapping out the factory style 22” radiator for a aluminum one, i already have the aluminum shroud from wizard cooling and was looking at getting one of their radiators. They offer both 1” tubes and 1.25” tubes? both have 16 fins per inch, is there such a thing as too big of radiator tubes? Right now with a mechanical fan and clutch and 180 degree t-stat in the summer i may see 195 with the factory style radiator
     
  2. Mike69cuda

    Mike69cuda 66 is the new 17 FABO Gold Member

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    Bigger the better, but Make sure the width of an aluminum radiator will work for your setup. That has been a real issue for me.
     
  3. Krooser

    Krooser Reform School Graduate

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    Last edited: Apr 16, 2021
  4. 71DodgeDemon340

    71DodgeDemon340 FABO Gold Member FABO Gold Member

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    the thickness of the factory style right now is right at 3” from mounting flange to where the shroud fastens, according to their dimensions the wizard radiator is 3” thick with both the 1” and 1.25” tubes
     
  5. 71DodgeDemon340

    71DodgeDemon340 FABO Gold Member FABO Gold Member

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    I was just thinking it would look better than the oe style

    F8E5BF37-50B3-414E-AA3B-E5B6D33AC9DD.jpeg
     
  6. KosmicKuda

    KosmicKuda FABO Gold Member FABO Gold Member

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    Original Mopar radiators are brass not copper. Brass is a copper/zinc alloy.
    Brass conducts heat almost 50% poorer than aluminum.

    Don't beat me up. Above is from pg 55 of current Mopar Action magazine, June 2021.
    You'll do fine with either 1" or 1-1/4" tubes but as already mentioned, pay attention to core thickness.
     
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    • 71DodgeDemon340

      71DodgeDemon340 FABO Gold Member FABO Gold Member

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      My biggest concern is i dont want to over cool the engine. Before i installed a fan clutch with a fixed fan i rarely saw over 180-185. With the clutch fan setup it stays between 190-195
       
    • yellow rose

      yellow rose Overnight Sensation FABO Gold Member

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      There is no such thing as “over cooling” an engine. That’s what the thermostat is for. It controls minimum operating temperature.

      You are much better off with the best radiator you can fit in there and let the thermostat do what it’s designed to do rather than skimp on a radiator and fight cooling issues.

      With that said, 1.25 tubes all day long and twice on Sunday. Do not skimp there. Find a way to make the rest of it fit.
       
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      • famous bob

        famous bob mopar misfit

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        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^this
        I put a big alum rad. in my 406 sbc pick up , it cooled so well that it cycled on the thermostat , ''no problem'' , never gave me a problem .
        I`d like to have a wider one in my barracuda even now .
         
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        • 71DodgeDemon340

          71DodgeDemon340 FABO Gold Member FABO Gold Member

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          So is the tube size and fin per inch count more important than number of rows?
           
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          • Krooser

            Krooser Reform School Graduate

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            I guarantee that the radiator cores are copper... tanks may be copper/brass alloy. Copper cools better than aluminum but some aluminum radiators have a different design that may make the equal to copper/brass.

            An old fashioned copper fin and plate design radiator will out cool any other radiator design regardless of the material. That's what Peterbilt used in their 379 models that I owned.

            I had one of those plate radiators from a Lincoln in an early latemodel stock car and it was a chore to get that 427 up past 160 degrees in a 50 lap race.

            I think an aluminum radiator in a vintage car looks out of place and most don't cool as well.
             
            Last edited: Apr 16, 2021
          • Krooser

            Krooser Reform School Graduate

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          • yellow rose

            yellow rose Overnight Sensation FABO Gold Member

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            Yes sir. Two big cores flow more than 3 or 4 smaller ones. It’s all about flow...coolant and air flow.
             
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            • 71DodgeDemon340

              71DodgeDemon340 FABO Gold Member FABO Gold Member

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              So it would be wise to go with the 1.25” tubes?


              Whats the main benefit of the 1.25” over the 1” tubes? Just more flow?
               
            • yellow rose

              yellow rose Overnight Sensation FABO Gold Member

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            • 72bluNblu

              72bluNblu FABO Gold Member FABO Gold Member

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              It’s NOT just about flow. It’s about surface area too. If you look at the thermodynamic equations that govern heat transfer, the two biggest components are surface area and flow.

              So no, you can’t just say bigger tubes and fewer rows are always better. That’s 100% not true.

              It’s a balance between flow and surface area. The Champion 3 row radiator, with .75” tubes, cools my .060” over all iron 340 pushing 400+ hp just fine. And I drive it all summer in temps as high as 110* F. Giant tubes are just as much of an advertising gimmick as adding more and more rows. You don’t need (or want) a 4 row radiator, just like you probably don’t need or want a 2 row with 1.5” or bigger tubes. Anybody that says different is trying to sell you something. And probably never had any education in thermodynamics.

              Between a 3 row with .75" tubes and a 2 row with 1" or 1.25" tubes the cooling numbers would come down the specific manufacturing details of that radiator. But I've seen both work just fine in an A-body, so unless you have more than the published information saying one is better than the other is just personal bias.
               
              Last edited: Apr 17, 2021
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              • 71DodgeDemon340

                71DodgeDemon340 FABO Gold Member FABO Gold Member

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                I did notice my temps jump about 10 degrees going from a fixed fan to a clutch setup. Also running a high flow water pump and t-stat
                 
              • 71DodgeDemon340

                71DodgeDemon340 FABO Gold Member FABO Gold Member

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                I just went and looked, my factory style radiator appears to have 3 rows of tubes and they look to be 1/2”
                 
              • yellow rose

                yellow rose Overnight Sensation FABO Gold Member

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                I’m not disagreeing. I said the 1 inch tubes are plenty for what he is doing. And yes, it’s not just about tube size. I’d take two tubes (or in the case of my truck) one big tube over 3 or 4 all day long.

                It’s also important that there is turbulence to keep the coolant in contact with the tube no matter what size it is.

                I’ll say it again. It pays long term dividends to fit the biggest radiator you can, run a high flow pump as fast as you can and still keep the belts on and let the thermostat do its job.

                It would be educational to test and see how one or two cores compare to three or four cores compare at various flow rates.
                 
              • 71DodgeDemon340

                71DodgeDemon340 FABO Gold Member FABO Gold Member

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                Im seriously thinking of ditching the milodon water pump and going with the flowkooler paired with a emp/stewart components 180 t stat

                the milodon is only 2 years old and its slowly leaking out of the weep hole only when the engine is off
                 
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