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Thread: Zero clearance for puller fan

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  1. #1
    Join Date
    Jan 2003
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    Castries, , Saint Lucia.
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    139

    Zero clearance for puller fan

    On my current rebuild, I intend to address and fix some nagging issues that have been problematic since my first rebuild several years ago. The first is the lack of clearance between my radiator and the front sway bar. Unlike most of your newer Uniques, my sway bar is mounted to two vertical tabs and there's less than 2 inches of space between the bar and the radiator, making it impossible to mount a decent sized puller fan, let alone a shroud. At first I tried to use the supplied traditional Cobra pushers out front, but it was soon clear that those were good for little more than decoration when the coolant temperature started to rise at idle or in slow traffic.

    I've run a couple of different pusher fan arrangements and the current setup works ok but not to the point that I fully trust it to cool the engine under very hot or slow conditions. The radiator itself is quite efficient and the fans never need to come on when I'm driving over 30mph. For peace of mind on longer drives and heading into town or heavy traffic, I would really like to install a large single puller or a shrouded dual fan setup on the engine side of the rad. This necessitates finding a way to move or tilt the bottom of the radiator forward 2 to 3 inches. I could modify the lower mount easily enough, but there will have to be some cutting of the inside of the front opening. Anyone face a similar issue, and were you able to craft a solution?

    Here's a pic of my predicament




    EDIT: I've even thought of doing away with the front sway bar altogether if it comes down to choosing between dependable cooling and a bit more body roll. A while back one of the sway bar bushing brackets broke completely off and I drove around that way for quite a while before noticing it when working on something else under the hood. In retrospect, the only difference was maybe a bit more rear tire rubbing in the right rear during hard cornering - the roads are very twisty down here and I get to drive fairly rapidly on some of the more remote roads.
    Last edited by Buzz; February 11th, 2018 at 10:44 AM.
    Tropical Buzz

  2. #2
    Join Date
    Sep 2003
    Location
    Roseville, CA, USA.
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    Have you looked at the SPAL fans? I squeezed one in between my sway bar and radiator. Very low profile and does the job for me. When I get in traffic and the engines heats up I flip the fan on and bingo - instant temperature drop. I've had it installed since 2004 and love it!

    Click image for larger version. 

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    Here are the specs if you are interested - https://www.summitracing.com/parts/spu-ix-30100400/overview/

    Phil

    427 Roadster, #4279436
    470/hp FE by FE Specialties
    3:31 and Toploader (wide ratio)

    Roseville (N.Cal)

  3. #3
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    Castries, , Saint Lucia.
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    I would definitely install one of these if I could, Phil. Not enough space for even the thinnest of fans, unfortunately.
    Tropical Buzz

  4. #4
    Buzz;
    I had the same problem; 2.05" between bar and radiator. I slotted the bushing mounts to the rear about an inch which gave me plenty of clearance to mount a Spal 16" fan and a flat full shroud. I also moved the end mounts back so the stand-offs would remain parallel.( I don't know if the last one was necessary but my knuckles were already bruised and bleeding so what the hell!) Another owner posted pictures of his shroud where he built a box big enough to mount the fan behind the bar and this gave him plenty of room. His name escapes me; it might have been Cobra Earl. It seems to me this problem should have been designed out long ago but what do I know?
    Bill
    Bill Stradtner, Portsmouth, VA
    427 S/C #9442
    427W Dart "Replica" Ford Engine

  5. #5
    Join Date
    Jan 2003
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    Castries, , Saint Lucia.
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    Hello Bill. I wish i had the same type of sway bar bushing mount that your later Uniques have so I could do the same. I apologise for the poor quality of the photo I posted, but you might be able to see that the only way I could move my bar back would be to cut the mounting tabs off and re-weld them a few inches back. I had inquired about doing this a few years ago and I was advised that doing so would result in serious problems with the sway bar geometry.
    Tropical Buzz

  6. #6
    Join Date
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    Gadsden, Al , USA.
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    Order a Spal #30100400 from Jegs, about $85.00. Make a spacer about 3/4" thick and shim the top of the radiator forward at the top, it will work.

  7. #7
    Join Date
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    Gadsden, Al , USA.
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    We have been using this fan for several years and it does the trick. Do you have the factory vin number for your car?
    Last edited by weaver; February 12th, 2018 at 02:53 PM. Reason: already posted

  8. #8
    Buzz, here's some pics of my fix years ago. I used 4 high performance 9" Zirgo fans. Cools the 427 stroker well. I uses a sheet of thin aluminum to mount the fans and force the air through the radiator. I added a toggle switch to the dash and operate with a relay.
    Good Luck, Gary Click image for larger version. 

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  9. #9
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    Very nice!
    Phil

    427 Roadster, #4279436
    470/hp FE by FE Specialties
    3:31 and Toploader (wide ratio)

    Roseville (N.Cal)

  10. #10
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    Gadsden, Al , USA.
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    Show off!!!

  11. #11
    Quote Originally Posted by weaver View Post
    Show off!!!
    Be nice Alan, are I won’t share my other Cobra secrets (lol). See ya in May!

  12. #12
    Join Date
    Jan 2003
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    Castries, , Saint Lucia.
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    Quote Originally Posted by beast View Post
    Buzz, here's some pics of my fix years ago. I used 4 high performance 9" Zirgo fans. Cools the 427 stroker well. I uses a sheet of thin aluminum to mount the fans and force the air through the radiator. I added a toggle switch to the dash and operate with a relay.
    Good Luck, Gary Click image for larger version. 

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    That is a really trick looking setup, Beast! Looks like it would keep the engine cool in Death Valley! Nice work.
    Tropical Buzz

  13. #13
    Join Date
    Jan 2003
    Location
    Castries, , Saint Lucia.
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    This is the current setup - dual 12" pushers, also using a relay. They move a lot of air, but being pushers they aren't as efficient as pullers so while I've never overheated using them, I just don't have that total comfort level that they wouldn't let me down in an extreme situation.

    Tropical Buzz

  14. #14
    Join Date
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    Seattle, WA, USA.
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    Has anyone looked into Sidewinder fans for this application? They are 1 5/8" thick and pull about 2400CFM.

    https://the-fan-man.com/product/side...ctric-fan-kit/
    Patrick Brown
    Forum Administrator

    Tighten it 'til it gets loose and back off half a turn.


  15. #15
    Join Date
    Jan 2003
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    Castries, , Saint Lucia.
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    Now there's one I haven't seen before! That might fit my application with the motor located at the 10:00 or 2:00 o'clock position. How to actually mount it might take some creativity though.
    Tropical Buzz

  16. #16
    Join Date
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    Gadsden, Al , USA.
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    The 16" Spal puller will do the job for under $100.00.

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