4 x 4 Australia - - Gear -

TO prop­erly un­der­stand how a diff works you need to un­der­stand power and torque, as well as how they re­late to one an­other.

Torque can be de­fined as a force that has a ten­dency to ro­tate an ob­ject around its axis. Torque in au­to­mo­tive ap­pli­ca­tions is mea­sured in Newton-me­tres (Nm). 1Nm is the torque on an axis that re­sults from the force of one Newton (about 0.1kg) on an arm 1m long.

Power is all about movement. The unit for mea­sur­ing power is the Watt (W).

One Watt is one joule per sec­ond. For our pur­poses, one joule equals 1Nm. En­gines power is mea­sured in kw (kilo­watt): 1kw = 1000W.

If you look at the sim­ple equa­tion be­low you can see there is a re­la­tion­ship be­tween torque, power and rpm:

Ex­posed rear diff of a Range Rover Sport.

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