Shroud or 4 electric fans?

General Mopar Tech Discussions

  1. mpro69rr

    mpro69rr Well-Known Member

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    Hey Guys,

    Thanks for all the suggestions in my other thread. I was able to get my 69 RR 383 with a lopy cam running pretty good by given the timing 12 initial and 36 full. I tried 18 initial but it would backfire and not run well, it seems to like the 12 and 36. Any way, I still have one problem. The temp, while idling moves up slowly and overheats. When it reached 220 I shut it off. I have an aluminum wizard rad with 1 " tubes and a fixed 18" 6 blade fan. My options for this is to get a shroud (383 22" rad originally did not come with it) or go with a 4 spal fan setup, both from wizard cooling? The cheaper option is a shroud but I don't know if that will work and don't want to waste the money. How does the 4 fan(puller) spal setup sound? Do you think that's better than going the shroud route and would it work better? Below is the link to the fan setup. As always thanks for your input!
    https://wizardcooling.com/1966-1969-22-core-mopar-aluminum-radiator-w-4-9-spal-low-profile-fans/

    One more note: I live in FL so it gets hot and also will be adding classic air conditioning.

    -Mark
     
    Last edited: May 9, 2021
  2. 3sloppydogs

    3sloppydogs Well-Known Member

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    I have always been a fan of the shrouded mechanical fan. They are not limited to the CFM they can draw.
    Shrouded with a clutch and proper distance from the radiator have always worked well for me.
    My thing with electrics are they are limited to the CFM
    For street use I like mechanical all my cars use this and never had a heating problem
     
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    • mpro69rr

      mpro69rr Well-Known Member

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      Thanks, I don't have a clutch and the fan is approx. 1 1/2" away from the rad. I wonder if being that far away is the problem?
       
    • 65-440

      65-440 Well-Known Member

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      Shroud with fan clutch, sounds like you're not getting enough airflow through the radiator while sitting still. Did you happen to see If your upper hose is under pressure when the engine temp is up? .....by the way 220 is not overheating at all !
       
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      • mpro69rr

        mpro69rr Well-Known Member

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        ensigh at 185 degrees
        By under pressure do you mean flowing? It is flowing, the stat opens right at180 degrees. I also drilled a hole in the stat.
         
      • 3sloppydogs

        3sloppydogs Well-Known Member

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        Didn't see it the first read. You are going to put AC in the car. You might want to think about a larger radiator, your condenser will be in front dissipating heat right to the radiator.
        I would run the larger radiator with a shroud, mechanical fan with a clutch
         
      • mpro69rr

        mpro69rr Well-Known Member

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        I would have to change the whole rad support to get a 26" rad in. I don't think I have money to do that, I just spent enough on the 22" rad and classic air. I may have try the shroud option. What would having a clutch do? I mean a direct fan runs all the time, not sure I have the room for a clutch.
         
      • Gerrs69rr

        Gerrs69rr Well-Known Member

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        I have fought basically the same problem over the years with my 383 unknown cam. Before speeding more money on after market parts remember this, the Chrysler engineers had it right. Stick with the shroud, stock 7 bladed fan, correct water pump (don't mess with high volume, more blades, less blades, whatever). There's something else that plays into this, timing, just a degree or two can make a difference on temp at idle. One more thing, oil viscosity, an old school mopar guy suggested 10w-40 over the 20w-50 is was running, now I'm not saying for sure what actually "fixed" the problem but I finally have it dialed in and it has never run so good. Also go through the thread here on this site it has a ton of great suggestions and 220, ha ha, mine would hit 230-35 at a red light on 100 degree days here in VA, that is nerve racking! 1620564956356332651547.jpg 1620564956356332651547.jpg
         
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        • 3sloppydogs

          3sloppydogs Well-Known Member

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          The clutch releases your fan when the water temp gets cooler. So at road speeds you are not spinning the fan as fast because its not necessary, assuming you have good flow across your core. As you slow down the fan engages to pull more air an cool.
           
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          • Shorthorse

            Shorthorse Well-Known Member

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            Once you have changed the cars original configuration you have stepped into the Twilight Zone. So many variables and what may work on one car does nothing on another. There have been countless threads on cooling. This could get expensive, I've been there. Before spending money do a couple simple things. First, check your thermostat on the stove with a thermometer. Just because it's new doesn't mean it works properly. If you think it's air flow, place a high velocity fan in front of the car at idle. Check for hoses collapsing at temp, especially at bends. With the cap off at temp look at the water flow in the radiator. Even as far as determining if your car is running too lean. You might see something that will put you on the correct path.
             
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            • 3sloppydogs

              3sloppydogs Well-Known Member

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              Very true about the lean issue
              I experienced that
               
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              • Gerrs69rr

                Gerrs69rr Well-Known Member

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                I didn't see the 1st read either, I put classic air on mine two years ago, you won't be disappointed, engineered extremely well, the fit and finish is almost perfect. I say almost because I'm still getting a little hotter at red lights so I went to make my last move and install a clutch fan. It doesn't fit (blades are touching compressor pully). I tried getting a shorter shaft clutch assembly (the one that fits on a Jag) but that still is to tight. I haven't given up, messing around with spacers but I just don't see it happening. If you do this make sure you get the stock water pump designed for A/C , it actually slows the flow down so the coolant stays in radiator just a little longer to help keep it cooler.
                 
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                • Gerrs69rr

                  Gerrs69rr Well-Known Member

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                  Yes, 3sloppydogs reminded me where i was going with timing, carb adjustments, I was way to lean, get them right and you'll be surprised.
                   
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                  • mpro69rr

                    mpro69rr Well-Known Member

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                    I think I will mess around with that today, maybe it is lean.
                     
                  • 65-440

                    65-440 Well-Known Member

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                    Under pressure, hose should feel firm not squishy. Your system should be sealed enough to hold pressure, if not you're guaranteed to run hot. Also sounds like your fan is too far away from the Radiator. Get it closer and use a shroud.
                    AND.....you don't need a new rad support to run a 26" Radiator in a factory 22" car.... just cut the opening larger on the passenger side and cover the "new" opening with small black door edge guard, nobody will ever know unless they really look.

                    20210508_173507.jpg
                     
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                    • mpro69rr

                      mpro69rr Well-Known Member

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                      Yes, I did check the pressure of the hose and it was firm. I'm leaning towards a shroud and maybe move the fan closer with a spacer.
                       
                    • Dennis H

                      Dennis H FBBO Gold Member FBBO Gold Member

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                      Shroud/Clutch.
                       
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                      • 65-440

                        65-440 Well-Known Member

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                        Dude I didn't know you had AC! Lucky fucker! Guess it's been that long since I've looked under your hood. Plus I've been kinda laying low lately, haven't been very active with the cars....I need to get back into it this year. I'm sure for a long drive!
                         
                      • slepr1

                        slepr1 Well-Known Member

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                        Shroud and clutch for sure. Electric fans are noisy! I have 2 spal on my cuda and not liking it. Also what coolant are you using? Did you try Water Wetter?
                         
                      • mpro69rr

                        mpro69rr Well-Known Member

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                        50/50 mix, I am going to try water wetter.
                         
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