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CFM of stock fan

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fr8train, Feb 6, 2001.

  1. fr8train

    fr8train 1/2 ton status

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    Anyone know what it is? For 88-91 K5's. Debating on Flex-i-lite fan or going with electirc on my ongoing project rig. Using for daily driving and moderate wheeling, staying away from rocks for now. 350TBI w/AC.

    " What day is today?....Febuary.....Its nudie magazine day!!!!!!!! " - Billy Madison
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Really don't have a clue. Flex alite is one of those solid fans right? Either stay with the clutch fan or go electric. Guys on the Monte Carlo list are always going through this. There is a heavy duy fan clutch available, I believe it was on the Caprice Wagons of the 80's. The trucks may already have this, I don't know for sure. Other than that, they use the dual electric fans off the FWD GM cars. The HP loss due to the stock clutch fan is very, very small when operating correctly.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. realsquash

    realsquash 1/2 ton status

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    I'd go with a stock clutch fan with a new HD clutch. Also make sure you have a shroud around it! IMHE electric fans are no good in this application.

    Squash
    <A target="_blank" HREF=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</A>
     
  4. HarryH3

    HarryH3 1 ton status Author

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    None of the electric fans will move as much air as the stock factory fan. The clutch disengages the fan when it isn't needed, so drag is minimal. Car Craft magazine tested a bunch of different fans on an engine mounted on a dyno. The only fan that used less HP than the factory clutch fan was an electric. But the electrics don't move as much air.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    I cannot answer your question about cfm BUTT I have an opinon about electric fans or a fan. I am using the BlackMagic M150 made by Flex-A-Lite. It is a sucker and is rated at 2800cfm the higest I could find for a single fan. It cools my 350 with ease. Even during a valley summer at 105 ideling at a stop lght my rig never goes above 205. When I get movin again the temp drops to 195. During the winter I run 185-190. I don't run any other fans just the M150. I keep my original fan in my trail stuff for that just incase it dies senario but other than that I would recomend this fan to any small block user!
    I love it!
    PS I also run the Summit HighFlow waterpump w/185 Stat and a 3 row rad freshly roded out!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.burt4x4.coloradok5.com>http://www.burt4x4.coloradok5.com</A>
     
  6. fr8train

    fr8train 1/2 ton status

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    Thanks for the input guys. I have no clue as to what is going to be installed yet. Summer is around the corner and I really want to get this thing running right.

    " What day is today?....Febuary.....Its nudie magazine day!!!!!!!! " - Billy Madison
     

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