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    Results 1 to 12 of 12
    1. #1
      Join Date
      Mar 2006
      Location
      Buffalo N.Y.
      Posts
      209

      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
      Location
      Henderson,NV
      Posts
      2,870
      Country Flag: United States
      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.
      Posts
      209
      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
      Location
      Henderson,NV
      Posts
      2,870
      Country Flag: United States
      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
      ...

    6. #6
      Join Date
      Mar 2005
      Location
      Loganville, GA
      Posts
      931
      Country Flag: United States
      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).
      2018 Cruze LT Hatchback
      2003 Suburban 2500 8.1L
      1975 MGB Roadster
      2003 GSX750F Katana

    7. #7
      Join Date
      Aug 2003
      Location
      Orlando, FL
      Posts
      8,745
      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.
      Posts
      209
      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
      8,745
      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
      547
      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.
      Posts
      209
      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
      496
      Country Flag: United States

      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 Trans Am "TireBird"
      M6 / LS6 minitubbed DSE Sub
      C5 frt LS1 rear disc brakes
      https://www.pro-touring.com/forum/showthread.php?t=14992
      69 R/S Z28 302
      15 Camaro ZL1
      90 Formula next project





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