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Technical opinions on how to mount a fan shroud

Discussion in 'The Hokey Ass Message Board' started by monkeyodoom, Mar 28, 2014.

  1. monkeyodoom
    Joined: Jun 10, 2013
    Posts: 54

    monkeyodoom
    Member
    from Arkansas

    I'm replacing the radiator on my 41 ford deluxe with a new aluminum radiator from champion. The original radiator did not have a shroud and cooled just fine but i'm putting in a new motor and would like to make sure that it is cooled properly. I'll be using a mechanical clutch fan and the motor is a chevy 350.

    Has anyone used one of the champion radiators for a 40ish model ford and made a shroud for it? Do you have any opinions/ideas on how to mount a shroud to this radiator?
     

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  2. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
    Member

    I would start by measuring the fan diameter and radiator and shopping the junk yard for a suitable shroud. You will see how they mount to the radiator support not the radiator. The shroud opening must be larger than the fan because the engine moves around. Do not overlook the older pickups and vans.

    If I could not find one to fit, or that I could modify to fit, I would be thinking of making one out of sheet metal.
     
  3. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,083

    Marty Strode
    Member

    This is one I built for a '32, notice the tabs welded to the side channels of the radiator. I installed rivnuts in the tabs.
     

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  4. unkledaddy
    Joined: Jul 21, 2006
    Posts: 2,865

    unkledaddy
    Member

    I would see how it runs without a shroud, before going to the trouble and expense of putting one on it.
     

  5. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 8,920

    mgtstumpy
    Member

    I recall reading something along the lines that the fan blades should be only 1/3 or 2/3 into the shroud to prevent cavitation of air. Air is then drawn through radiator to exit the rear and isn't stale and hot which in turn causes heat build up.
     
  6. Canuck
    Joined: Jan 4, 2002
    Posts: 1,086

    Canuck
    Member

    Marty, nice work

    Canuck
     
  7. 59 brook
    Joined: Jun 12, 2005
    Posts: 1,017

    59 brook
    Member

    summit sells a few do it yourself shroud kits that aren't to expensive and work well
     
  8. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    Here's a pic I found of my home made shroud and it's attachment to the radiator.
    [​IMG]
     
  9. blue 49
    Joined: Dec 24, 2006
    Posts: 1,437

    blue 49
    Member
    from Iowa

    Here's one I made. I think a simple hoop shroud is just as effective as elaborate boxed in ones.

    Blue
     

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  10. monkeyodoom
    Joined: Jun 10, 2013
    Posts: 54

    monkeyodoom
    Member
    from Arkansas

    Thanks. that gives me some ideas on how to mount it. i don't have any welding skills so i was looking at using rivits to mount the shroud to the radiator. i'm hoping that i wont need one but its a new motor and new radiator so not sure as of now how well it will work without one.
     
  11. BootleggerMatt
    Joined: Aug 17, 2011
    Posts: 258

    BootleggerMatt
    Member

    The one marty posted is a great example and beautifuly done. You want it to cover the entire radiator, you are creating ducting to suck air through your radiator, when people just put the ring around the fan, it only allows the fan to pull air in that circle and you loose four corners worth of cooling. The fan blades should be 1/2 inside the shroud. Thermostatic Clutch fans (little curly spring on front) are the best in my opinion, but they absolutely need a shroud to work right. Without a shroud the hot air is not focused on the clutch and it won't heat up enough to fully engage when the motor is at temp... and the motors will actually run warmer in cold weather due to the ambient air being colder and not letting the clutch warm up. Weird but I speak from experience.
     
  12. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,083

    Marty Strode
    Member

    Thanks Canuck and Matt, here is one more example mounted on steel side channels. This one never runs over 180 !
     

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  13. BootleggerMatt
    Joined: Aug 17, 2011
    Posts: 258

    BootleggerMatt
    Member

    I like to split mine so it's easier to take it off and get to the fan bolts and belts... I don't have a pic of mine, but here's a stock 1964 Galaxie shroud I got the idea from. The bottom just stays bolted to the radiator when servicing anything or changing fan belts.
     

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  14. jeffgies
    Joined: Oct 4, 2009
    Posts: 48

    jeffgies
    Member

    How deep should a shroud be? I'm thinking something along the line of Mr Strode's above (nice one btw)
     
  15. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,083

    Marty Strode
    Member

    How much room do you have between the fan and the radiator? I think, as long as you don't bury the fan in the shroud, you could build it 1 1/2" minimum up to 8" deep. This one is around 2 1/2". P1010072.JPG
     
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  16. jeffgies
    Joined: Oct 4, 2009
    Posts: 48

    jeffgies
    Member

    There's 4" of clearance from the water pump pulley and downward and there's at 6" of clearance above the pulley. I have to use an electric fan, which I guess gets mounted to the 'outside' of the shroud.
     
  17. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,083

    Marty Strode
    Member

    Here is one with an electric fan on a drag car. IMG_2052.JPG IMG_2052.JPG IMG_2055.JPG IMG_2058.JPG IMG_2059.JPG IMG_2060.JPG IMG_2061.JPG IMG_2061.JPG
     
  18. 325w
    Joined: Feb 18, 2008
    Posts: 5,647

    325w
    ALLIANCE MEMBER

    Danchuck offers a nice looking stamped steel shroud for the tri five Chevys that might fit a lot of these older cars well. May be to wide for the early Fords
     

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