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    Thread: Torque calculation in NM and KGM. what is the difference?

    1. #1

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      Torque calculation in NM and KGM. what is the difference?

      Friends, I am not an Engineering guy....so just wish to know the difference about Torque calculation in NM and KGM. What is this NM and KGM measures? and also what is the difference between BHP and TORQUE? Why diesel engines have more torque than a petrol vehicle? Seems silly questions to you all. Please throw some simple idea about this
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      Nm stands for Newton Metre.

      Kg-m stands for Kilogram Metre.

      Nm multiplied by a factor of 0.102 gives you the Kg-m figure. Both are measures of torque.

      HP = (Torque x RPM)/5252.

      Diesel engines are usually turbocharged while their petrol siblings are naturally aspirated and they also run way higher compression ratios than petrols. Hence the higher torque on diesels.

      This is the simplest possible explanation.

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      ^ BHP = Torque X RPM
       
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      Quote Originally Posted by mclaren1885 View Post
      HP = (Torque x RPM)/5252.
      Torque is in pounds feet (lb-ft) in the above formula.

      HP = 2πNT/4500

      π = pi = 3.1415...........
      N = RPM = rotations per minute
      T = Torque in KgM
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      Quote Originally Posted by a.jayamohan View Post
      and also what is the difference between BHP and TORQUE?
      like a friend once said,

      TORQUE is how *hard* you hit a wall

      POWER is how *far* you take the wall with you
      and yeah, add a 0 at the end of kgm to convert it to Nm [approximately]

      thats as simple as it gets.

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      Torque

      Quote Originally Posted by mclaren1885 View Post
      Diesel engines are usually turbocharged while their petrol siblings are naturally aspirated and they also run way higher compression ratios than petrols. Hence the higher torque on diesels.
      Hi Rahul,

      I think for 2 engines with similar displacement (Excluding forced induction) the petrol engine will generate more Torque.

      A few examples of NA petrol and diesel engines.

      Petrol F4-134 --2187/2193cc - 16Kgm approx
      Diesel XDP4.9 --2112cc - 12Kgm approx
      Petrol K20A -- 1998cc - 21kgm approx
      Petrol K20A -- 2157 - 23Kgm approx
      Diesel 2.0SDI -- 1968cc - 14Kgm approx
      Petrol P-Series 6cyl - 3956cc - 26-28Kgm
      Diesel W04D 4cyl - 4009cc - 22-26Kgm

      Regards,

      Arka
      Last edited by ex670c; 16th May 2011 at 14:46.
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      Quote Originally Posted by ex670c View Post
      I think for 2 engines with similar displacement (Excluding forced induction) the petrol engine will generate more Torque.
      good point Arka. the figures look mighty close though. maybe a lot of the torque generated by diesels gets wasted in moving the heavy internals around?

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      Flywheel

      Quote Originally Posted by 007 View Post
      good point Arka. the figures look mighty close though. maybe a lot of the torque generated by diesels gets wasted in moving the heavy internals around?

      Hi Venkat,

      The Torque is usually calculated at the flywheel, so loss/friction is factored in. If you look closely you will see, similar displacement petrol engines have around 10% more torque, than their diesel counterparts.

      Regards,

      Arka
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      correct Arka. I was only wondering what it would have been like if one made diesel engines with pistons, rods, etc that weighed similar to their petrol counterparts but could withstand the beating.

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