Torque and Chrome

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327 V8 engine cylinder head bolts require tightening to a torque of 90 Nm. If you use a torque wrench that is 50 cm long to tighten the bolts, how much force perpendicular to the wrench must you apply to the end of the wrench?

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1. You need 92Nm. The wrench is 50 cm =.5m Torque = Force x Moment arm (length of the wrench) 90Nm = F x .5m F = 180N --> Answer
2. Torque is a measurement of a force multiplied by a length. Your known quantity is 90 Newton meters (which would be a force of 90 newtons, applied perpendicularly to a wrench 1 meter long). Since you have a wrench half a meter long (less length) you would need an proportionally larger force (more push) to apply the same amount of torque. If you reduced the length to .25 m (1/4 of a meter) you would need four times the force to apply the same torque.