Serpentine Belt System / Fan

Discussion in 'Engine Topic' started by Green hornet, Jul 17, 2018.

  1. Green hornet

    Green hornet Veteran Member

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    Of those of you that have installed a surpentine belt system have you installed an electric fan also? Or have you found a fan to bolt to the water pump? I understand the water pump is reverse direction. Let me know your thoughts.
     
  2. czizza

    czizza Veteran Member

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    i have an electric fan. I also use the March Performance system and did NOT need a reverse water pump. The march uses two belts one for AC/PS and one for Alt/Water Pump. There are more like that too.
     
  3. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    I bought a reverse rotation clutch/fan setup from Rock Auto.
     
  4. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    The serpentine setups I've seen generally specifically say not to run a mechanical fan
     
  5. jeff swisher

    jeff swisher Veteran Member

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    I built my own serpentine system from junk yard pulleys.
    Lower pulley from late 80's early 90's that is serpentine.
    Then a ford pulley for the alternator they bolt right on. Or GM if ya have one.
    The water pump pulley is a serpentine with grooves from a Ford also ..Same 6 groove but the issue is the pulley will not have the correct depth.
    It will not sit back far enough. So I cut the front mounting area out and cut the nose off my GM regular v groove pulley making it about 1" long.. I add that to the snout on the ford pulley and weld the 2 together to get the proper depth.

    I am out 30 bucks and a belt needs purchased and now I have standard rotation water pump and i use a Flex fan from an old Ford..
    These are very strong fans and you can find them in different diameters.
    Just redrill to the chevy pattern.
    No need to worry if you get the holes spot on as you can elongate the holes and it still runs true as it stays centered on the nose pin.. same diameter pin.
    I have ran the Ford fans to 8500RPM and never had an issue.
    Continuous RPM at 6500 for many minutes never an issue.
    They pull less power than a GM clutch fan.
    Yea that is a big thing to say about a clutch fan.. but I got a new fan and clutch and installed it and it would make the belt scream from slipping and you could feel the engine was lugging.
    30 years i have used those Ford fans on all my stuff and no more worries about a clutch going bad.
    I have only had 3 clutches go bad on me and all 3 times it was not good.

    You need fab skills to perform the surgery above or at least a red neck :)
     
  6. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    I used the GM aftermarket kit like you buy from Jegs and others, this is the only note about using a mechanical fan;

    This package utilizes a reverse rotation water pump. As
    such, if a production fan and clutch assembly is to be
    utilized, the parts must be the same configuration as the
    vehicle.
     
  7. Knuckle Dragger

    Knuckle Dragger Mayor of Simpleton Staff Member Lifetime Gold Member

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    Yeah I never heard you can't run the mechanical fan either. GM used mechanical fans on serpentine system all the time. I used the fan from a 1500 TBI truck before I went electric IIRC.
     
  8. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    I was referring to aftermarket (March etc)
     
  9. hoppin5478

    hoppin5478 Veteran Member Lifetime Gold Member

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    I've done this swap a few times and have used the 4th gen Camaro fans. They cool extremely well and are fairly cheap at the junkyard. They also fit extremely well in our Camaro's with a very small amount of trimming.
     

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