Scania v8 730hp

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 98989, Apr 16, 2010.

  1. V8Lenny

    V8Lenny Road Train Member

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    Torque is just a number, horsepower makes the work. When the torque goes up, so does hp. HP= Torque x rpm
     
  2. Scania man

    Scania man Road Train Member

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    I know if you do the math there's just a fraction in it but, it that were true why are scania getting more torque per hp than the Volvo ? I'm not trying to be a smarts** I just don't understand it!
     
  3. Scania man

    Scania man Road Train Member

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    Im pretty sure that hp is calculated from the torque readings, the torque I believe is the actual twisting force on the crank shaft, ( like an airgun for removing your tyre, it will have the torque force marked on it) torque is the all important figure . I've always suspected Volvo put higher hp badges on the trucks than they actually producing. My 420 hp scanias would hold into the 460 hp volvos on any hill, an old 143 450 hp would annihilate them! That's why I always kept the volvos on light work like dry freight and used the scanias for fridge and livestock work.
     
  4. 98989

    98989 Road Train Member

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    this is in france they are legal 57ton on 6axles

    here we dont have such advanced trailers we mainly use truck +full trailer setups not semitrailers and we haul only short logs

    but drawbar trailer fallows truck very good

    here we also have many similar tight places , and since forest jobs here are not large forest road are very bad


    also here we have many overloads it is normal to load 80-90ton on 5axle or even sometimes up to 110tons on 6axles all with twin tires so soil is very soft and truck can sink on one side and with high center of gravity it is easy to roll over .....
     
  5. 98989

    98989 Road Train Member

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    now volvo try to correct that they now have all stronger engine than badge is (except fh16 700 or now fh16 750)

    they did it recently and all get 8-12hp more than before

    so as i already wrote now fh(13) 540 is 550hp

    fh16 600 is now 612hp .....
     
    Scania man Thanks this.
  6. V8Lenny

    V8Lenny Road Train Member

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    Because max torque and max hp are not usually at the same rpm, except some DAF engines. Scania has limited the torque more at max hp rpm.

    The formule when using Newtonmeters is: HP = Nm x rpm / 7019

    So let's take 3500 Nm at 1200 rpm: 3500 x 1200 / 7019 = 598 hp

    Then 730 hp at 1800 rpm : 7019 x 730 / 1800 = 2847 Nm

    Torque is a static number but piston engines must be spinning to make any torque so there's always also hp. Electric engines can make torque at zero rpm but then they don't have any hp.

    Torque per hp is useless comparison.
     
    Scania man Thanks this.
  7. 98989

    98989 Road Train Member

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    Last edited: Sep 10, 2011
  8. Scania man

    Scania man Road Train Member

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    Today it's September
    11th, no matter what your beliefs are today is the day we show our respect as gentlemen and ladies to our fellow friends and colleges on this forum, Today we ain't Americans and Europeans : today we are all colleagues , we all know of a fellow countryman lost in 9/11, bit today we are truck drivers, today we are friends!
     
    C16KIWI Thanks this.
  9. Scania man

    Scania man Road Train Member

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    I got a proper drive of an r730 today, holy sh**, the power is mental! The little finishing touches make it feel special too, 41 tons on it today , I could slow right down behind other trucks on steep hill then just drop half a gear and accelerate as if it was empty, unbelievable ! The two pedal auto is nice too but I think I'd like a clutch pedal too, I'm not sure if it's as light on fuel as they say, I got 9 mpg but then again I was getting carried away with the power messing around so that may not of helped
     
  10. 98989

    98989 Road Train Member

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    i would like also to have 3pedal opc it is more stupid but cheaper ( 965€)

    and i believe that clutch life and life of synchros are longer

    than on 2pedal, also less parts to brake down

    i have seen opc without clutch only 3times until now

    ( on r400 highline and r480 topline from presenting of new r series and on r440 highline as scania demo truck)