Electric fan for drag car

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  1. theman440

    theman440 Well-Known Member

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    I'm contemplating going to an electric fan on my drag car. Anybody have a suggestion on what CFM fan to use . . . or that I can get away with. I'd like to keep the amp draw as low as possible. I've done some research and it appears that the higher the cfm, the higher the amp draw. Previously I had been using the old school Moroso electric water pump drive with a flexalite fan.

    Thanks in advance.
     
  2. LemonWedge

    LemonWedge Well-Known Member

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    :popcorn2:
     
  3. gtxracer

    gtxracer FBBO Gold Member FBBO Gold Member

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    "the man" I have used and still use the same cooling set-up as you, forever. It allows me to control engine temp and I've not found a reason to change.
    Bob :moparsmiley:
     
  4. dvw

    dvw Well-Known Member

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    Your correct about amp/cfm. I use a dual setup from a late model Charger/Challenger/300. Both fans running together pull 25-30 Amps. I can run one or both. It'll cooldown in 90 degree weather in less than 5 minutes to 140.
    Doug
     
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    • 5.7 hemi

      5.7 hemi FBBO Gold Member FBBO Gold Member

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      A single 2 speed fan works great, especially if you use a PWM controller. I installed one from Rainbow Products with their controller on a 6.1 Hemi, works awesome, but it can draw up 50 amps. Now the thing with a PWM (pulse width modulation) is there isn’t a sudden hit/spike to the electrical system. It ramps up and down as needed by your set temperature. Plus it’s quiet as hell. Can’t really hear it at all.
       
      Last edited: May 24, 2019
    • Budnicks

      Budnicks You Can Just Thank Me Latter FBBO Gold Member

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      My car isn't really just a dedicated racecar anymore
      it's more of a street beast/drag car in search of a corner
      I live in the sticks, windy mountain roads, at elevation

      I've use similar set up on my old drag car, a 68 RR too

      I use 2 Perma-cool electric fans
      pretty shallow in design only stands off like 3-1/8" to 3-1/4"
      (I have a thicker alum. 3 core rad., so it is sort of tight)

      1 Perma-Cool 13" prm-19113 Summit Racing, aux. pusher (outside)
      alum Blade pusher rated at 2600 cfm, at 5-6 amp full draw
      (now they are rated at 3000cfm) reversible blade, to push or pull/draw
      for just in case, it's rarely ever used at all (or you can reverse polarity too)
      68 RR Perma-Cool Electric fan 13 in. alum. in 3000cfm prm-19113 $153.05 Summit.jpg

      1 Perma-Cool 16" prm-19115 Summit Racing, puller for my main cooling fan
      puller alum blade, inside an alum. shroud,
      fan is rated at 2950cfm @ 6-8amps, at full draw (moves some serious air)
      reversible blades to push or draw/pull (or you can reverse polarity)
      68 RR Perma-Cool Electric fan 16in. alum. 2950cfm prm-19115 $157.31 Summit.jpg

      & also an electric water-pump 35-37gpm from Pro-form
      fits right in the M/P alum (or OE style) water-pump housing

      everything is wired/ran thru Bosche 30 amp relays,
      & an override arming switches, Painless panel for my electronics

      car stays right at around 180*-190* even driving it in Calif. summer heat
      cruising, on just the 16" fan, the 13" is for just in-case
      it gets 'really hot' stuck in traffic or cruising etc.
      I can cool it off quicker, never needed it or rarely

      I don't use a thermostat either,
      I use a restrictor where the thermostat would go
      with an open appr. 5/8" hole, to help slow the water/flow down a bit
      so it helps/stays in the radiator (an MRE Alum. 3 core, down flow, 22")
      long enough to help cool it

      hope any or some of that helps, works great for me
       
    • theman440

      theman440 Well-Known Member

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      Thanks for all the input guys.
       
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