1. Iceman_krebs

    Iceman_krebs Active Member

    Messages:
    31
    Likes Received:
    9
    Joined:
    Jul 29, 2015
    Location:
    Windsor, Colorado
    Local Time:
    4:50 PM
    Hey guys. I have a 1969 Dodge dart swinger with a 340 in it. I've been having cooling problems but I suspect that it is due to fact I don't have a shroud and thermostat. Any suggestions on a thermostat that would fit the neck of an air gap edelbrock intake #7576 and what temp to get? Also, I have a 15" flex fan (pic) and a 22" x 18" radiator. Any ideas what fan shroud I should get or how to go about finding one? I've tried the google searching. Should I stick w the flex fan or get another one? Any help would be greatly appreciated. Thank you.

    image.jpeg

    image.jpeg
     
  2. RogerRamRod

    RogerRamRod The Older I Get, The Faster I Was

    Messages:
    960
    Likes Received:
    581
    Joined:
    Jul 5, 2011
    Location:
    Chesapeake VA
    Local Time:
    6:50 PM
    That's funny, the Iceman needs cooling help. But seriously folks, I haven't heard much good about flex fans. My understanding is you are better off getting a stock style clutch fan. I can't help you with a part number for a shroud, but I did see somewhere an article on making a decent looking fiberglass one, I'll see if I can find it and a link.
    Fan Shroud Fabrication - Street Rodder Magazine
     
    Last edited: Jun 12, 2016
  3. d1970

    d1970 TODAY IS A GOOD DAY TO HAVE A GOOD DAY

    Messages:
    378
    Likes Received:
    175
    Joined:
    Sep 29, 2015
    Location:
    Ontario, Canada
    Local Time:
    5:50 PM
    definitely a fan shroud with the fan sticking half in the fan shroud to take full advantage of the rad air flow. You could use a 180 or 195 thermostat, either will work. As for the 15 inch flex fan I would ditch it and go with a 18 inch Mopar OEM fan 2863224 it will pull more air through the rad.
     
    • Agree Agree x 1
    • JKrebs

      JKrebs 68 GTS

      Messages:
      126
      Likes Received:
      20
      Joined:
      Jan 15, 2015
      Location:
      Greensboro MD
      Local Time:
      6:50 PM
      I had a cooling issue as well with my 68 340. Using stock fan and clutch. I went with a 4 core rad, shroud and high flow 180 therm from classic industries. I also added a high flow water pump from Summit. The water pump did not have the normal high flow impeller like you would see on a 340 with AC. It has an impeller like you would see on hydronics system pump in a building if you know what i am talking about. Here is the link FlowKooler Hi Flow Mechanical Water Pumps 1701. Motor runs cool. Oh and car has AC. Nice last name!
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

      Messages:
      20,603
      Likes Received:
      8040
      Joined:
      Jan 19, 2014
      Location:
      South-Central Manitoba,Canada, 900ftelevation
      Local Time:
      5:50 PM
      Before you buy anything else, ditch that fan!

      Then we need to know when is it not cooling; is it at idle? or speeds under 30mph? or from 30 to cruising speed? Each of these has different solutions
       
      • Agree Agree x 1
      • alpha13

        alpha13 Well-Known Member

        Messages:
        373
        Likes Received:
        15
        Joined:
        Jan 31, 2015
        Location:
        Iowa
        Local Time:
        5:50 PM
        Like others have said. Ditch the flex fan and get a viscous clutch fan and a shroud. You shouldn't run without a thermostat as it could cause damage. Not running hot enough. Of course you don't have that problem. Assuming your water pump is in good shape and your radiator isn't clogged with crap. I would think you would be in good shape after a decent fan upgrade. I don't use a shroud, but I have one in case I have cooling problems.
         
      • Darthomas

        Darthomas Ashamed to be seen in foreign cars

        Messages:
        827
        Likes Received:
        215
        Joined:
        May 10, 2016
        Location:
        Chicago, Illinois
        Local Time:
        5:50 PM
        7 blade non flex, add shroud, clutch is good, but they fail at the weirdest times.
        I once changed a water pump on a small block, and it had lost about half its blades.
        That made a big difference.
         
      • inertia

        inertia Well-Known Member

        Messages:
        3,453
        Likes Received:
        726
        Joined:
        Feb 4, 2011
        Location:
        Victoria B.C. Canada
        Local Time:
        3:50 PM
        FWIW.

        I have several vehicles successfully running around with 7 blade viscous fans, NO shroud.

        Can you get a measurement from the fan mount flange to the rad. It's gonna be close, but a OEM 69 clutch fan is 2 5/8 inches from flange to end of clutch, 3 1/2" for a moho 7 blade clutch that I commonly use..

        fan clearance 010.jpg

        fan clearance 008.jpg

        hope it helps . cheers

        fan clearance 004.jpg

        and Yep, the fan clearance is only about a 1/4 inch from the clutch to the rad, the motor is secured from moving forward in case of abrupt stops.

        After 4 yrs of spirited driving by my son,, no interference yet.. lol

        I'm touching wood here.. lol
         
        Last edited: Jun 12, 2016
      • Darthomas

        Darthomas Ashamed to be seen in foreign cars

        Messages:
        827
        Likes Received:
        215
        Joined:
        May 10, 2016
        Location:
        Chicago, Illinois
        Local Time:
        5:50 PM
        Quarter inch is scary!, but should pull air through like crazy, without a shroud.
         
      • inertia

        inertia Well-Known Member

        Messages:
        3,453
        Likes Received:
        726
        Joined:
        Feb 4, 2011
        Location:
        Victoria B.C. Canada
        Local Time:
        3:50 PM
        I was a little worried when I put it in, But since then I've used 2 other similar units from motorhome's, cheap at $30, no interference from any, it's closest by the upper tank, did a little adjusticating there.

        cheers.
         
      • Iceman_krebs

        Iceman_krebs Active Member

        Messages:
        31
        Likes Received:
        9
        Joined:
        Jul 29, 2015
        Location:
        Windsor, Colorado
        Local Time:
        4:50 PM
        Thank you so much for all the info guys. I greatly appreciate it. I've got a 180 thermostat on order and I'm gonna fifth the flex fan for an 18" clutch fan. The water pump and 2 stage radiator are brand new, but I guess that doesn't mean I could have a blockage. I'll throw the new fan and thermostat in and see what happens and then if I need the shroud I'll put that in too.

        Definitely starts over heating while at idle to 30 mph. Any other info or advice is welcomed and appreciated. The iceman needs to stay cool!
         
      • AJ/FormS

        AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

        Messages:
        20,603
        Likes Received:
        8040
        Joined:
        Jan 19, 2014
        Location:
        South-Central Manitoba,Canada, 900ftelevation
        Local Time:
        5:50 PM
        Problems from Idle to 30mph point to not enough air-flow through the rad.This usually points to the fan. But can include the shroud, a faulty fan-clutch,and airflow to,through,and around, the rad and also out from underneath the hood.
        The stat sets the minimum running temperature. If/when over-cooling is possible,the stat will close, to try to keep the engine at a minimum running temperature.
        Good cooling from cruising speed, down to about 30mph, indicates that the system is able to shed heat with ram-air flow through the rad, and adequate coolant circulation.
         
        • Agree Agree x 1
        • Iceman_krebs

          Iceman_krebs Active Member

          Messages:
          31
          Likes Received:
          9
          Joined:
          Jul 29, 2015
          Location:
          Windsor, Colorado
          Local Time:
          4:50 PM
          Got it running cool now fellas. Thanks for the ideas. Went w a derale single electric fan and shroud combo. Put some low profile bolts on for the water pump pulley. I have 3/4" to spare. Also went w the derale single fan controller. Don't recommend this though. The temperature sensor in the radiator works intermittently at best, so I use the manual switch most of the time.

          image.jpeg

          image.jpeg

          image.jpeg
           
        • RPMagoo

          RPMagoo Just An Old Motorhead

          Messages:
          3,207
          Likes Received:
          1743
          Joined:
          Nov 4, 2015
          Location:
          N.E. Pa.
          Local Time:
          5:50 PM
          -- Yep -- Plus 180 Tstat -- Classic Industries has shrouds. -- Also be sure that your crank pulley is larger than the water pump/fan pulley.
           
        • AJ/FormS

          AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

          Messages:
          20,603
          Likes Received:
          8040
          Joined:
          Jan 19, 2014
          Location:
          South-Central Manitoba,Canada, 900ftelevation
          Local Time:
          5:50 PM
          Yeah that WP pulley looks to be mighty small, which means that if the lower is still original size, That WP is gonna be slamming the water through at a higher speed than Might be required.And if it gets to moving too fast,it may not pick up the heat. Or it may cavitate and destroy the pump. And you may not realize that has happened, cuz the only evidence is the rapidly climbing temp.gauge.
          But if the lower pulley is properly sized to maintain the factory ratio, then you're good.
          Manually operating the fan-controller is not a good idea. It is ok to have a manual over-ride, but the automatic mode should remain operational.Running the engine too cool is not a good thing either. Not good for power,or economy,nor engine life.
           
        • nm9stheham

          nm9stheham Well-Known Member

          Messages:
          12,090
          Likes Received:
          3954
          Joined:
          Dec 20, 2013
          Location:
          Waynesboro, VA
          Local Time:
          6:50 PM
          Just looking at the 2nd pix in the 2nd pix group, the crank pulley looks to be smaller than the WP pulley......it is almost totally hidden by the WP pulley but you can see it.
           
        • gtsdude

          gtsdude Well-Known Member

          Messages:
          835
          Likes Received:
          190
          Joined:
          Jan 10, 2010
          Location:
          SE MN
          Local Time:
          5:50 PM
          Yep, most the aftermarket pulleys are all under driven, in fact I have yet to see any sold for mopars that are over driven, it is the exact opposite of what you want when you have cooling issues. If you have an aftermarket aluminum rad with 2 cores, like a lot of them are, the core tubes are larger and you need more flow to get the coolant to tumble through them and shed heat.
           
        • inertia

          inertia Well-Known Member

          Messages:
          3,453
          Likes Received:
          726
          Joined:
          Feb 4, 2011
          Location:
          Victoria B.C. Canada
          Local Time:
          3:50 PM
          Here's a new car we fired last thursday. It was a 93* record breaking day.

          The car is 340, with a new Champion rad, and thats a 5 blade clutch fan.

          It ran all thru break-in, thru tune-up, then the nec test drives, 180 thermostat, and never moved past 185 ish.

          No shroud, seals, electric fans.

          hope it helps, cheers

          upload_2016-8-24_9-19-42.jpeg
           
        • Iceman_krebs

          Iceman_krebs Active Member

          Messages:
          31
          Likes Received:
          9
          Joined:
          Jul 29, 2015
          Location:
          Windsor, Colorado
          Local Time:
          4:50 PM
          The water pump pulley is smaller than the crank pulley. I don't kick the fan on until it hits 180. Doesn't go above 190 usually.
           
        1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
          By continuing to use this site, you are consenting to our use of cookies.