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Thread: Electric Fan Application?
          
   
   

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  1. #1
    bigpat1802 is offline CHR Member Visit my Photo Gallery
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    Electric Fan Application?

     



    I'm new and have a 64 Impala i'm workin on. She has a 454 w/ an estimated 450HP. She hasn't been started or dynoed but desktop dynoed ( I know not accurate)!

    I live in Nebraska where it's HOT during the summer (90-100*). I'm going to use my factory radiator that has been recored and cleaned to start out. If need be I'll get an aluminum if the fan doesn't work well.

    What I need to know is what kind and how many cfm fan do I need? People tell me I need a 16" 3000cfm fan. I've also been told about the Black Magic Flex fan that puts out 2800cfm and has a shroud.

    What do you guys think about fans and cfm for my application?

    Thanks Pat!
    Big Body Big Block

  2. #2
    mikec is offline CHR Member Visit my Photo Gallery
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    Use the biggest full fan that will fit with the highest CFM's and it is a must to use a shroud. I think it is a pretty wide radiator if my memory serves and you could use dual's as well. Stick with Spal fans. I have been fighting this whole cooling thing and after all the research, Spal makes the best fan.

  3. #3
    Ed ke6bnl is offline CHR Member Visit my Photo Gallery
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    Originally posted by mikec
    Use the biggest full fan that will fit with the highest CFM's and it is a must to use a shroud. I think it is a pretty wide radiator if my memory serves and you could use dual's as well. Stick with Spal fans. I have been fighting this whole cooling thing and after all the research, Spal makes the best fan.
    I am using a spal dual fan, may or may not be big enough for your big block but on my 327 old corvette motor 300 hp and with the griffon aluminum radiator I have yet to see the 2 spall fans run for more then one minute and cycle off, tha is at temp close to 100 degrees. The part I like about the spall fan housing are the several flexable rubber air check valves that allow full flow of the air going through the rad at highway speed. When the fans kick in the the one way seals shut and allow the fan to do its full potential. 2700 cfm and 26 amps. Ed ke6bnl
    Ed ke6bnl@juno.com
    1963 Ford Econoline 5 window
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  4. #4
    bigpat1802 is offline CHR Member Visit my Photo Gallery
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    Actually the radiator on a Impala is SMALL ...15x24" I believe.

    I know a shroud is a necessity and I'm not good at fabricating things.


    Hmmmmm
    Big Body Big Block

  5. #5
    Bob Parmenter's Avatar
    Bob Parmenter is offline CHR Member Visit my Photo Gallery
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    Originally posted by bigpat1802
    Actually the radiator on a Impala is SMALL ...15x24" I believe.

    I know a shroud is a necessity and I'm not good at fabricating things.


    Hmmmmm
    Given your admitted limitations I don't understand why you're trying to reinvent the wheel. Double check that radiator size. My BB rad is 25x22, has a factory shroud, and a 17" 6 blade fan, works great. It was engineered by a high paid (relatively), professional..............................a GM factory engineer. You often see backyard designed cooling systems overheat; how often do you see properly maintained factory systems do so?
    Your Uncle Bob, Senior Geezer Curmudgeon

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  6. #6
    bigpat1802 is offline CHR Member Visit my Photo Gallery
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    The reason is b/c I have the long water pump on there.
    When I went to put on my shroud..I folded the alternator back over and it hit the shroud.

    Don't get me wrong..I'd go w/ a mechanical..but I have billet serpentine pulleys and I feel that an electrical would work better in my circumstances.
    Big Body Big Block

  7. #7
    Bob Parmenter's Avatar
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    Okay,
    check with Year One, 800-932-7663, I know they make an electric fan/shroud set up for Chevelles, they may do Impalas too.

    Mike, why not post a pic of your radiator/shroud combo, it's a beauty!
    Your Uncle Bob, Senior Geezer Curmudgeon

    It's much easier to promise someone a "free" ride on the wagon than to urge them to pull it.

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  8. #8
    Ed ke6bnl is offline CHR Member Visit my Photo Gallery
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    Since I am home from work I thought I would show you my spall fan and Griffen radiator combonation for may 327/300 hp motor for my 50 Ford F1 Ed ke6bnl
    Ed ke6bnl@juno.com
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  9. #9
    mikec is offline CHR Member Visit my Photo Gallery
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    Here is the picture I posted of the engine in the earlier post where the radiator and shroud show pretty well. It is a PRC Radiator. Just give them the demensions and they will build it to your exact specifcations. Just be sure if you order a shroud from them that you are exactly sure where the center of the fan, either electric or mechanical needs to be or cut your own hole.
    http://img67.photobucket.com/albums/...1/39Engine.jpg

  10. #10
    bigpat1802 is offline CHR Member Visit my Photo Gallery
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    That looks good Ed..I'm sure that more than enough for that engine...Loookin good!
    Big Body Big Block

  11. #11
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    Shrouds

     



    I have seena few posts here that say that a fan shroud is a must. Well If the fan is a puller, then I would say that a shroud probably is a good idea, however, if the fan is a pusher, mounted in the front of the radiator, the shroud does more harm than good. It restricts airflow to the entire radiator when the car is in motion.

    Toaster.

  12. #12
    bigpat1802 is offline CHR Member Visit my Photo Gallery
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    Yeah..I"m going to get a puller.

    I've also been looking at a jeep forum where the guys are saying that the mid 90s 3.8 Ford Taurus' has a strong fan and pulls a ton of cfm.. One guy went to say that they both had the same id # however they look different and in size I believe..maybe not.

    I'm going to try one and I'll let you guys know my results here in 2 wks. I couldn't find a Mark VIII anywhere
    Big Body Big Block

  13. #13
    jaymaechtlen's Avatar
    jaymaechtlen is offline CHR Member Visit my Photo Gallery
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    pusher fan bad?

     



    Maybe dumb question, but:
    What's wrong with a pusher fan?

    True, most factory setups are pullers, but that's not a complete answer...

    regards
    Jay

  14. #14
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    Toaster is offline CHR Member Visit my Photo Gallery
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    Agreed that a pusher is not the optimum setup. But, when there no room for a puller, as in my '34, the pusher is the only option. if a pusher is used, definately there should be no shroud and the fan blades and housing need to be as unrestrictive as possible.
    Toaster.
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  15. #15
    Toaster's Avatar
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    Oh, yeah... The size of the radiator has a lot to do with it too. if your radiator is just barely doing the job now, a pusher fan will make things worse. I always try to run more radiator than I need. (for those long afternoons stuck on the freeway ;-)
    Toaster.
    Life is too short... Just do it!

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