Help cooling 408 stroker

Heating / Cooling / AC

  1. kursplat

    kursplat FABO Gold Member FABO Gold Member

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    by regularly i'll say a few days each summer.
    last sunday it hit 120.7 at my house, to which we say "welcome to Phoenix" :lol:
     
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    • 512Stroker

      512Stroker We are all here because we are not all there.

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      You dont need a cooling system, you need your head examined. LOL
       
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      • jbc426

        jbc426 Well-Known Member

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        Grab yourself a one of the high performance SPAL twin fan set-ups with controller and twin 40 amp relays. They will clear your water pump and dramatically outflow your current single fan set-up.
         
      • j par

        j par Well-hung Member

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        Like I said though if his cooling system isn't up to keeping his temperature down and the study 40 miles an hour and up those fans aren't going to do anything for him ultimately. If they do they're a Band-Aid for an inferior cooling system...
         
      • 1994redram

        1994redram FABO Gold Member FABO Gold Member

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        I tried the champion shround/fan assembly, a flex a lite high output, and finally an HHR fan. I have a magnum based 408 with a high flow pump, 180 'stat, champion 22" radiator, etc. All brand new. My car would idle all day in 100 degree temps at ~185 max. But it would slowly overheat with city driving and QUICKLY overheat on the highway. Ive had it at 240 degrees before i got stopped.

        I've tried 50/50 mix, 50/50 with water wetter, straight water with water wetter, etc. I tried it with a stock pump and high flow pump.

        I finally restricted the HUGE 1" bypass hose and put a 3/8" hose on it. That in theory forces more water through the rad. And reduces the hot water recycling back into the engine. My car runs 200 max now on the highway after some hard runs.
        20200723_182211.jpg
         
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        • cudavert

          cudavert DARTAHOLIC

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          That's really interesting and almost amazing. Never thought of that but it does make sense. One thing I would add is that I'm a huge fan of engine oil coolers. They can pull out a lot of heat as well.
           
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          • autoxcuda

            autoxcuda Well-Known Member

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            Did you run a shroud with your old mechanical fan system?

            I run that Champion 4-row radiator

            I don’t think they sell a good mechanical fan shroud because the radiators are so generic. ??

            I made my own. AND I run a cut down by 2” diameter MP fan kit. Yes 1” cut off the widest part of the blade. That’s because the early Champion radiator had the top hose too near the center of the radiator tank and it interfered with std diameter fan. Later I had it moved over, but kept the cut down fan (more HP)

            Like was brought up previously, I METICULOUSLY, cleaned the water passages of my block. Hot tanks nowadays are weak. And even though, you gotta get in there and pick it clean. Coat hangers, wire, tiny flashlights, hose picks, screwdrivers... you name it.

            No issues for me.

            Also, in So Cal you don’t need Anti Freeze. Run distilled water and 1 bottle Justice Brother Radiator Super Cool and 1 bottle Justice Brothers Radiator Protector.

            I’ve got 8 years on my 340 stroker (416)
             
            Last edited: Sep 12, 2020
          • j par

            j par Well-hung Member

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            This could be one of the reasons that I don't have as many problems as most because I did not run a heater at all or a bi-pass... Or a thermostat... Just a gutted one.. distilled water with a bottle of redline water wetter...
             
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            • kursplat

              kursplat FABO Gold Member FABO Gold Member

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            • fsoria1315

              fsoria1315 Member

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              Well I changed out the water pump to a high flow, have a champion 2 row radiator, and 3000 CFM flex a lite fan. So I will see how it goes when I install everything over this weekend.
               
            • 512Stroker

              512Stroker We are all here because we are not all there.

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              IMHO you are not there yet.
              Try it, then we'll talk
              Best of luck
               
            • fsoria1315

              fsoria1315 Member

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              What do you recommend I'm all ears.
               
            • 512Stroker

              512Stroker We are all here because we are not all there.

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              Automatic or shifter car?
              2 row radiator - what are the core dimensions?
              What is your water pump to crank pulley ratio?
               
            • fsoria1315

              fsoria1315 Member

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              Finally had 2 spal fans, 2 spaw relays, and went with 50% antifreeze 50% distilled water with a bottle of water wetter. Can seems to be running cooler ran around 210 out here in Cali while its 99 degrees outside right now.

              20201015_130314.jpg

              20201015_130300.jpg
               
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              • 512Stroker

                512Stroker We are all here because we are not all there.

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                Some would say that 210 is OK
                For me that is still way to hot.
                You did not answer my questions from post #38
                I cant give you any help with out more info.
                That water pump pulley looks very large in diameter, that's part of your problem.
                 
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                • autoxcuda

                  autoxcuda Well-Known Member

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                  You can run 25% antifreeze to 75% in California unless you live in a ski resort at high elevation.
                   
                • fsoria1315

                  fsoria1315 Member

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                  MC2374 Radiator Dimensions:
                  Total: 21.13" tall x 25.75" wide (including brackets)
                  Core: 15.88" tall x 22.5" wide x 2.75" thick
                  Inlet: 1.5" driver side
                  Outlet: 1.75" passenger side
                  Tanks: 3.13" thick
                  Tubes: 0.63" thick


                  How do I get the water pump to crank pulley ratio?
                   
                • fsoria1315

                  fsoria1315 Member

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                  Elevation where I live is 4000 plus and snows sometimes in winter.
                   
                • kursplat

                  kursplat FABO Gold Member FABO Gold Member

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                  that's the mid-point on my stock gauge

                  measure the circumference of both and report back
                   
                • j par

                  j par Well-hung Member

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                  I never have been a big fan of those shrouds that are like a flat wall. I tried one and it didn't seem to help. And definitely when you're traveling at speed it almost seems to hurt. And also it seems like no matter what you'll have to have the fans on all of the time...
                   
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                  • 512Stroker

                    512Stroker We are all here because we are not all there.

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                    How many rows of .63 tubes?
                    With the cap off look inside the neck and count the rows.
                    I take the diameter or circumference of water pump and crank pullies. Divide the largest number into the smaller, that will roughly give you the percentage of overdrive which is really what you are looking for.
                     
                  • fsoria1315

                    fsoria1315 Member

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                    Its a 4 row champion radiator.
                     
                  • 512Stroker

                    512Stroker We are all here because we are not all there.

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                    Well there is part of your problem
                    4 row rads are old tech the 4th row will actually transfer heat back into the 3 row making them both pretty much useless.
                    Modern trend is to use 1 or 1 1/4 inch tubes for only 2 rows
                    I have had several 2 row they cool very well
                    Look at Griffin radiators they are made in the USA and work very well
                    Are you sure your lower rad hose is not collapsing at cruzing rpm?
                     
                  • autoxcuda

                    autoxcuda Well-Known Member

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                    I have a cheap Champion 4 row in my 416. Drive in 90+ So Cal weather. At track in California desert, highway cruise at 3400+ rpm... no issues.

                    I suspect there’s more issues than a radiator going on.
                     
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                    • fsoria1315

                      fsoria1315 Member

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                      Hot days it runs 210 and under no problem. Cool days it runs 180 and under.
                       
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