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Thread: G35 Fan Direction?

  1. #11
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    Also is it worth installating a second condensor fan on the drivers side or would that just mess up air flow and make it worse?

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  3. #12
    I am he, fear me the evil twin's Avatar
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    2nd fan 'inline' will not usually improve many situations and can make it worse.

    The principle in play is thermo-dynamics.
    The objective is to draw thermal energy from the Rad and into the air mass and dump the air.
    The air mass energy dissipation is directly related to the fan efficiency and rated in 'cubic feet a minute'.
    The more cubes you move the more change in temp you get (delta T)
    If you have one fan that has a higher CFM than another "inline" then the 2nd doesn't do much except impeded flow.
    Exception is where one is a fixed CFM (elec) and the other is variable and both can free wheel.

    Pushing or pulling is not relevant if the fan is ducted.
    What goes in the front of the fan comes out the back so if the fan is ducted onto the Rad , front or back mount is irrelevant.

    DOR of the fan
    Some fans are universal IE the blade is symetrical and shifts the same CFM no matter the DOR
    Many fans are not and the fan blade is asymetrical (aspect ratio changes towards trailing edge) and designed to be more efficient (much more usually) in one DOR.
    If you want to reverse the operation of an asymetric fan you have to swap the position of the assy from behind to in front, swap the fan blades on the shaft, and swap the polarity of the motor.

    The above is some of the reasons why the A/C condensor fans are offset and have their own 'duct' in relation the engine driven/Rad fan combo on a factory vehicle.
    It is also some (not all) of the reasons why if you fit eleccy fans you rrsehole the engine driven fan
    Last edited by the evil twin; 24th February 2018 at 06:17 PM.
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  5. #13
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    Quote Originally Posted by the evil twin View Post
    2nd fan 'inline' will not usually improve many situations and can make it worse.

    The principle in play is thermo-dynamics.
    The objective is to draw thermal energy from the Rad and into the air mass and dump the air.
    The air mass energy dissipation is directly related to the fan efficiency and rated in 'cubic feet a minute'.
    The more cubes you move the more change in temp you get (delta T)
    If you have one fan that has a higher CFM than another "inline" then the 2nd doesn't do much except impeded flow.
    Exception is where one is a fixed CFM (elec) and the other is variable and both can free wheel.

    Pushing or pulling is not relevant if the fan is ducted.
    What goes in the front of the fan comes out the back so if the fan is ducted onto the Rad , front or back mount is irrelevant.

    DOR of the fan
    Some fans are universal IE the blade is symetrical and shifts the same CFM no matter the DOR
    Many fans are not and the fan blade is asymetrical (aspect ratio changes towards trailing edge) and designed to be more efficient (much more usually) in one DOR.
    If you want to reverse the operation of an asymetric fan you have to swap the fan, and the polarity of the motor (elec)

    The above is some of the reasons why the A/C condensor fans are offset and have their own 'duct' in relation the engine driven/Rad fan combo on a factory vehicle.
    It is also some (not all) of the reasons why if you fit eleccy fans you rrsehole the engine driven fan

    Thankyou.

    So in regards to push or pull. Its okay either way with the G35 fan? Originally I had it same blade direction as factory fan and it worked fine.
    Now I have it the other way and it seems to work fine too.

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    Is it one of these? https://www.ebay.com/itm/Infiniti-G3...ts=Model%3AG35
    If so it is an asymetric fan and will be much more efficient with the correct DOR.
    If you go by 'rude' measurement like engine temp, wet finger, sound etc it may well appear to 'work' either way.

    If you measure the actual CFM with an anemometer I'll bet 1/2 a can of flat Suffolk it is shifting heaps more cubes one way compared to t'other.

    If you are bolting it to the factory fan clutch the the DoR must be correct with the 'F' to the front or you are wasting efficiency
    Last edited by the evil twin; 24th February 2018 at 04:01 PM.
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    Quote Originally Posted by the evil twin View Post
    Is it one of these? https://www.ebay.com/itm/Infiniti-G3...ts=Model%3AG35
    If so it is an asymetric fan and will be much more efficient with the correct DOR.
    If you go by 'rude' measurement like engine temp, wet finger, sound etc it may well appear to 'work' either way.

    If you measure the actual CFM with an anemometer I'll bet 1/2 a can of flat Suffolk it is shifting heaps more cubes one way compared to t'other.

    If you are bolting it to the factory fan clutch the the DoR must be correct with the 'F' to the front or you are wasting efficiency

    You Legend. Yes thats the one and yes thats the answer that I need to hear.

    Thanks mate. You know your stuff!

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    Digging up an old thread, But wondering does anyone know if a G35 fan will fit onto a ZD30DI viscous hub?

  10. #17
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    Quote Originally Posted by GUFLEX View Post
    Digging up an old thread, But wondering does anyone know if a G35 fan will fit onto a ZD30DI viscous hub?
    No and why would you want too? They don't overheat.

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    Quote Originally Posted by mudski View Post
    No and why would you want too? They don't overheat.

    Was just curious for the most part, as if i ever have to replace the fan in the future might as well upgrade (Have seen a few fans break apart from being perished/old)

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  13. #19
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    Quote Originally Posted by GUFLEX View Post
    Was just curious for the most part, as if i ever have to replace the fan in the future might as well upgrade (Have seen a few fans break apart from being perished/old)
    Ahh ok. Even if it did fit you wouldn't see any benefit other than probably running too cold.

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    I don't think I have ever seen a fan blow back through the radiator to the front of the vehicle. One reason could be is that when you are driving along air is forced through the grill and then through the radiator. If you had a fan blowing in the other direction you would have opposing air flows.

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