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    Results 1 to 15 of 15
    1. #1
      Join Date
      Oct 2017
      Location
      Caldwell, OH
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      Country Flag: United States

      How much CFM to cool LS

      Working on 67 Camaro with 6.0 lq9, 4l80E and vintage air. The motor has some mods, should be around 450hp at the wheels. I have the Griffin ls radiator with there dual fans. After reading more about them I realized the fans are only rated at 870cfm each. The car is not on the road yet so i really don't know if this will be enough to cool it or not?

    2. #2
      Join Date
      Apr 2018
      Posts
      23
      Country Flag: United States
      I'd want min double that... look into spal fans, they're $$$ I have couple 11" versions that pull ~1800cfm each.

    3. #3
      Join Date
      Oct 2017
      Location
      Caldwell, OH
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      38
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      Thanks for reply. I wonder if there is a different way they test these fans. Griffin mentions true cfm? I dont know why they would put such small fans on there radiator.

    4. #4
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
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      Why don’t you wait and see how it goes before replacing the fans? I would think the core design plays a heavy role and the question can’t be easily answered...

      True CFM likely means in the application versus some free air testing. The specs are so nebulous that you can likely get widely varying test results...

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    5. #5
      Join Date
      Oct 2014
      Location
      DFW, Texas
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      Quote Originally Posted by dhutton View Post
      Why don’t you wait and see how it goes before replacing the fans? I would think the core design plays a heavy role and the question can’t be easily answered...

      True CFM likely means in the application versus some free air testing. The specs are so nebulous that you can likely get widely varying test results...

      Don
      I agree.
      1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
      1976 Dodge D100 - Warlock
      2016 Subaru WRX - E30 Tune

    6. #6
      Join Date
      Oct 2017
      Location
      Caldwell, OH
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      38
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      Will do. I talked to griffin yesterday and they assured me it would cool my engine. They said it would cool 600hp to the wheels. I'm probably around 450hp to the wheels so it should be ok. They also recommended a 180 thermostat.

    7. #7
      Join Date
      Dec 2008
      Location
      Detroit
      Posts
      2,584
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      As others said I would wait. The other thing that comes into play is your radiator tubing. I chose the Griffin because they use 1.25" tubes, most others I've seen are only doing 1".
      Big dreams, small pockets....

      Chris--
      '72 Cutlass S LSA/T56 Magnum
      Bowler Performance, Rushforth Wheels, ATS, Holley EFI, KORE3, Ridetech

      Project Motor City Madness

    8. #8
      Join Date
      Apr 2001
      Location
      The City of Fountains
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      15,971
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      Quote Originally Posted by 67CamaroLSX View Post
      ....They also recommended a 180 thermostat.
      I would really love to know their logic for using a 180 thermostat. A stock one is 187 degrees.

      Also, GM rates their OEM fans in watts. I am using a C6 Corvette fan in my Cougar and it is rated at 400 watts, so it draws about 32 amps. I would look at the amp rating for the fans that you have and if they are not rated to pull at least 15 amps, I would look for other options.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
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      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    9. #9
      Join Date
      Dec 2004
      Location
      bowling green,ky
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      845
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      they are designed to run pretty warm anyway. mine runs 195-200 most of the time with stock thermostat. in my suburban the engine runs 210 all the time
      69 Camaro
      03 z06
      90 mustang coupe

    10. #10
      Join Date
      Oct 2017
      Location
      Caldwell, OH
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      38
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      What temps do you have your fans to kick on at? I think mine kick on at 205 low and high speed @ 225.

    11. #11
      Join Date
      Apr 2001
      Location
      The City of Fountains
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      Quote Originally Posted by 67CamaroLSX View Post
      What temps do you have your fans to kick on at? I think mine kick on at 205 low and high speed @ 225.
      On a stock configuration, the fans kick on at 212 and shut off at 205. This is why most "normal" engine operating temperatures tend to be between 205 and 210. I have variable speed fan control on my Cougar and I start to ramp in the fan at 200. I rarely see temperature above 210, but I also have a hole in my hood, which helps to vent a lot of underhood heat. I also shut the fans off above 35 mph.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    12. #12
      Join Date
      Dec 2010
      Location
      Fredericksburg, VA.
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      3,155
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      I agree wait to see what actually happens once you get the car running. But in general, I want the most cfm I can fit behind my radiator. I'm running a single flex-a-lite rated at 3300cfm and have no over heating issues even on days over 100deg out.

      Steve Hayes
      "Dust Off"
      68 Camaro

      Given sufficient initial acceleration, even pigs can fly!


    13. #13
      Join Date
      Aug 2007
      Location
      Denton Texas
      Posts
      1,236
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      Quote Originally Posted by TheJDMan View Post
      I agree wait to see what actually happens once you get the car running. But in general, I want the most cfm I can fit behind my radiator. I'm running a single flex-a-lite rated at 3300cfm and have no over heating issues even on days over 100deg out.
      Do you have a pic? can you text or put it here?? Trying to see that it looks like

    14. #14
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
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      Quote Originally Posted by qnitro View Post
      Do you have a pic? can you text or put it here?? Trying to see that it looks like
      Hi Kevin. I am guessing this is it:

      https://www.summitracing.com/parts/flx-188/overview/

      Don
      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside

    15. #15
      Join Date
      Aug 2007
      Location
      Denton Texas
      Posts
      1,236
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      Thanks Don, yeah wanted to see it actually in the car also..I'm gonna pull the trigger I think, want to know how it was mounted on the Radiator more than anything.

      Quote Originally Posted by dhutton View Post
      Hi Kevin. I am guessing this is it:

      https://www.summitracing.com/parts/flx-188/overview/

      Don





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