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  1. #1
    Join Date
    Mar 2006
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    Buffalo N.Y.
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    195

    Default How many amps do elect. fans draw ??

    Does anyone truley know what the AMP/CFM ratios are? I've looked quite a bit and see all kinds of claims by companies.
    Example- How many amps drawn to produce 1500CFM's.
    I'm going to go with 2 10" fans and would like not get hoodwinked and buy a pair of duds.

    Jeoff J.
    Buffalo, NY
    69 Camaro convertible ~ 350ci. ~ T56

    To all u guys with the knowledge.
    My Ride: http://community.webshots.com/user/yukongt


  2. #2
    Join Date
    Sep 2006
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    Henderson,NV
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    Default

    Every fan has specs for amp draw. As long as you are buying them from a respectable manufacturer.
    Todd

  3. #3
    Join Date
    Mar 2006
    Location
    Buffalo N.Y.
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    195

    Default

    let me rephrase this. ....Is there an average, like 6-10 amps will usally produce roughly 1250 CFM's? Say there are 5 reputable companies selling fans that claim to produce 1250 cfm but the amp draw is scatterd between these companies from 6 to 15 amps.How do you know which is closest to the truth.
    Jeoff J.
    Buffalo, NY
    69 Camaro convertible ~ 350ci. ~ T56

    To all u guys with the knowledge.
    My Ride: http://community.webshots.com/user/yukongt

  4. #4
    Join Date
    Sep 2006
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    Henderson,NV
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    Default

    You plan for the worst. Heat and speed will add current to a fan. Two decent fans require to good relays period. 30 amp per fan is what I would recommend.
    Todd

  5. #5
    Join Date
    Feb 2009
    Location
    Long island, New York
    Posts
    668

    Default

    ...

  6. #6
    Join Date
    Mar 2005
    Location
    Loganville, GA
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    863
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    Default

    Fan amperage does vary by fan (Lincoln Mark VIII fans spike around 70 amps at startup for example). One note, 2 10" fans may not be enough cooling for your car. Check with fan suppliers for how much cooling you will need. I have one 16" 3000 cfm fan and keeps the car cool, although in hot weather it creeps up a bit sitting still in traffic. It doesn't get too hot, maybe 215, but I still worry a little. I may add a second fan in front if I can get it to fit (oil cooler in the way).
    Randy Pajer
    79 GMC C35 Dually - truck stuff
    81 Camaro - CP car
    99 Bonneville SLE - DD

  7. #7
    Join Date
    Aug 2003
    Location
    Orlando, FL
    Posts
    8,767

    Default

    Be carefull which fans you buy. Forget the amerage draw, just put a pait of 30 Amp relays on it and forget it. But 10s basically suck , or should I say DON'T suck! Unless you get high performance fans which are very tall. The low profile 10" fans will only pull about 500CFM, I don't care what the claims are. I would really suggest trying to at least move up to 11s, and get the Spahl high Performance units that are about 2 1/2" deep, assuming you can clear those.

  8. #8
    Join Date
    Mar 2006
    Location
    Buffalo N.Y.
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    195

    Default

    Thanks guys for the input. Frank I've been running a stock copper rad. and clutch fan with no problems. here in Buffalo there is no bumper to bumper and I have had zero problems with over heating.
    If I go with a stock SIZE aluminum rad. I can only fit 10" fans but If I go with a little wider like 24" or 26" rad. I will be able to fit 12" fans in there.
    Jeoff J.
    Buffalo, NY
    69 Camaro convertible ~ 350ci. ~ T56

    To all u guys with the knowledge.
    My Ride: http://community.webshots.com/user/yukongt

  9. #9
    Join Date
    Aug 2003
    Location
    Orlando, FL
    Posts
    8,767

    Default

    Go for a "Big block" size radiator. And go with the bigest fans you can. the 10s really pull very little. Been there, done that, got a tee shirt, lit the tee shirt on fire!

  10. #10
    Join Date
    Sep 2004
    Location
    Near Dayton, OH
    Posts
    538

    Default

    I've been doing some research on electric fans lately and just bought a new setup for my car. The rule of thumb I found was that for every 1000cfm of air flow the fans should pull 10amps.
    So a true 2000cfm fan should be pulling around 20 amps.

    It makes for comparing electric fans a little easier and weeding out the false cfm ratings. I've seen quite a few 10" fans stating the flow 2000-2500cfm but if you look at their amp draw, its usually less than 10amps.

    Derale dual fan setup I just bought has two 13" fans rated to pull 4000cfm for the pair and they have a 50amp draw.
    Andrew
    1987 Olds Cutlass Supreme FE3X Clone
    EFI455/T56/9" w/ 4.30 gears


  11. #11
    Join Date
    Mar 2006
    Location
    Buffalo N.Y.
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    195

    Default

    Thanks Adrew and guys thats the info I needed. Now go take a look at my new post about fan shrouds....
    Jeoff J.
    Buffalo, NY
    69 Camaro convertible ~ 350ci. ~ T56

    To all u guys with the knowledge.
    My Ride: http://community.webshots.com/user/yukongt

  12. #12
    Join Date
    Nov 2004
    Location
    Dallas Texas
    Posts
    485

    Default fan

    Quote Originally Posted by Topless69 View Post
    Thanks guys for the input. Frank I've been running a stock copper rad. and clutch fan with no problems. here in Buffalo there is no bumper to bumper and I have had zero problems with over heating.
    If I go with a stock SIZE aluminum rad. I can only fit 10" fans but If I go with a little wider like 24" or 26" rad. I will be able to fit 12" fans in there.
    Topless, a Taurus 3.8l fan with shrould would be a near perfect setup for the stock size rad in your car-its also a 2 speed setup and they move quite of bit of air and can be had for cheap-about 25$ at your pick-n-pull or 50$ off Fleabay and it includes a shroud all youw ould need is to fab some mounts up and wire it.
    Rich
    69 clonification Trans Am "TireBird"
    M6 / LS6 minitubbed ATS spindles
    C5 frt LS1 rear disc brakes
    http://www.pro-touring.com/forum/showthread.php?t=14992
    69 R/S Z28 302 4.10
    99 Firehawk dd



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