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3406b pump mod help!!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by flc120, Aug 14, 2012.

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  1. Nov 22, 2012 #111
    Les2

    Les2 Road Train Member

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    Yeah I'm confused on the whole engine fan thing too...
     
    Les2, Nov 22, 2012
    Les2, Nov 22, 2012
    #111
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  3. Nov 22, 2012 #112
    SmokinCAT

    SmokinCAT Road Train Member

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    For what that truck does and the rpms it sees, there was no need to have a direct drive fan on that engine. I have a set of electric fans to put on it, but I am still looking for a better truck to put that engine in. I hate that GMC, but it has a good drive train in it.
     
    SmokinCAT, Nov 22, 2012
    SmokinCAT, Nov 22, 2012
    #112
  4. Nov 25, 2012 #113
    flc120

    flc120 Heavy Load Member

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    hey smokin cat how many cfm would you think the electric fans would need to be to core a radiator the size of ours more or less?

    i would think the electric fans would be better as they would keep engine cool at all times especially down here in south florida lol. i already have 2 (12") smaller fans on the ac condensor up front to eliminate the use of the fan clutch but was thinking of ditching the thought of having to use the fan clutch at all by just installing to large electric fans..
     
    flc120, Nov 25, 2012
    flc120, Nov 25, 2012
    #113
  5. Nov 25, 2012 #114
    SmokinCAT

    SmokinCAT Road Train Member

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    You would have to have something comparable to what the regular fan flows, mine is not a working truck and builds very little heat in it because it doesn't run for long periods of time, but the way I have set them up before is so that each cross tube in the radiator has some sort of airflow passing over it.

    Then another thing to pay attention to would be how you wire them in, I would definitely have a relay for each fan as they draw a lot of power when wire directly.
     
    SmokinCAT, Nov 25, 2012
    SmokinCAT, Nov 25, 2012
    #114
  7. Nov 27, 2012 #115
    flc120

    flc120 Heavy Load Member

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    yes thats is correct i wonder if anyone knew the CFM numbers the stocks fan clutch pulls in to compare to different electric fans sold out there they make them all sizes 12V i would definetly wire them sepreately to a relay. it should work tho would see why not.
     
    flc120, Nov 27, 2012
    flc120, Nov 27, 2012
    #115
  8. Dec 9, 2012 #116
    flc120

    flc120 Heavy Load Member

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    yes thats is correct i wonder if anyone knew the CFM numbers the stocks fan clutch pulls in to compare to different electric fans sold out there they make them all sizes 12V i would definetly wire them sepreately to a relay. it should work tho would see why not.
     
    flc120, Dec 9, 2012
    flc120, Dec 9, 2012
    #116
  9. Dec 29, 2012 #117
    flc120

    flc120 Heavy Load Member

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    does anyone know how much CFM is needed to cool these big motors or the amount of CFM put out by the factroy fan clutch.
     
    flc120, Dec 29, 2012
    flc120, Dec 29, 2012
    #117
  10. Dec 29, 2012 #118
    swaan

    swaan Road Train Member

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    I do know that the fan on a 6.0 ford powerstroke at full song flows about 10,000 cfm. So if the fan in a class 8 tractor is double that size and then some. A good guess would be in the 20-30 thousand cfm range. If your thinking of removing the factory fan and replacing it with electric for over the road work you would be wasting your time and money. They just don't make electric fans capable of that kinda flow. That's with old school class 8 fans. Don't even get me started on the monsters that come on the newer egr engines. They roar and suck in small children at anything over a idle lol!!!
     
    swaan, Dec 29, 2012
    swaan, Dec 29, 2012
    #118
  11. Jan 5, 2013 #119
    flc120

    flc120 Heavy Load Member

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    but if the blade is large wouldnt it spin less rpm then a smaller blade like yours? Come to think about it the clutch fans on engines are direct drive like oldschool cars so once kicked on they should spin at the same rpm as the enigne is what im thinking? Now in terms of volume and amount of air moved thats a different case cuz i can get a 12" fan which spins 10k rpms and put it on your powerstroke but it would do anything in cooling as it will have the CFM needed bit not the size needed to cool surface area. I think it spins at about 5k rpms a normal clutch air fan the problem is finidng one or multiple fans to cool the amount of surface area with the needed CFM.
     
    flc120, Jan 5, 2013
    flc120, Jan 5, 2013
    #119
  12. Jan 5, 2013 #120
    flc120

    flc120 Heavy Load Member

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    i guess i answered my own question. Next i will be plumbing the side cover on the pump for the feed line for better distribution.
     
    flc120, Jan 5, 2013
    flc120, Jan 5, 2013
    #120
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