Demystifying "Torque" and what "Nm" and "Kgm" means.. in simple English
Power and Torque are two terms that are always mentioned to convey the performance of the engine of an automobile. I had earlier posted on the difference between power and torque, and today let me post on how to physically visualize Torque.
"Torque is the simply the force which is responsible for twisting the wheels on your bike".
One easy way to visualize torque is to see the photo posted below in which the rider is performing a tyre burnout.
How is torque produced in an Internal Combustion engine?
The vertical (up-down) motion of the piston inside the combustion chamber produces the torque.
It is exactly for this very reason why engines with "long stroke" engines (like Royal Enfield bikes) are rich in torque and are good for cruising at relaxed speeds.
The vertical motion of the piston is converted to rotational motion which is transferred to the gearbox and then to the wheels.
Photo Source: HowStuffWorks.Com
How to visualize the Torque units as mentioned on the Technical Specifications page
Torque units are usually mentioned in Nm (Newton Meter) or in Kgm (Kilogram Meter). There are other units too but the above two units are mostly used in India to represent as the unit for Torque.
Consider that there is a 1 meter long rod which is fixed at one end and the other end is free to rotate. Torque figure of "1 Kgm" can be visualized as the twisting force which is developed due to a weight of 1 Kg acting at the movable end of the 1 meter long rod.
Eg: The Hero Honda Splendor has a Peak Torque figure of 0.78 Kgm, which means that the Peak Torque developed on the Splendor is equivalent to around a weight of 780 gms acting on the momovable end of a 1 meter long rod.
To convert Kgm (Kilogram meter) to Nm (Newton meter), just multiply it by 10 (the exact conversion would be to multiply by 9.81, but 10 times is practically quite close).
And to convert from Nm to Kgm just divide by 10.
Eg: The Pulsar 220 DTS-i develops a peak torque of 19.1 Nm, which means around (19.1/10) =1.9 Kgm. So one can visualize the peak torque of the Pulsar 220 as a weight of 1.9 Kg acting on a the end of a 1 meter long rod.
I hope I was able to make the concept of "Torque" easier to understand.
- What is the difference between Power and Torque of a motorcycle?
- What is a Long Stroke / Short Stroke Engine? Which is better?
- What is Engine Knocking? Do you really know?
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