Torque Converter

Divide by 1.3558. One hundred newton metres is about 73.8 pound-feet.

Because they are different physical quantities that happen to share dimensions. Torque is a turning effect; a joule is work done. Keeping the names distinct prevents adding one to the other.

Convention uses pound-feet for torque and foot-pounds for energy, precisely to keep the two apart. In practice they are used interchangeably and the context usually settles it.

Power is torque times angular velocity. An engine's peak torque and peak power occur at different speeds, which is why both figures are quoted.

Tightening a fastener to a specified torque, which corresponds to a specified clamping force. Under-tightening lets a joint work loose; over-tightening stretches the bolt past its elastic limit.

Substantially. A lubricated thread reaches the same clamping force at noticeably lower torque, so applying a dry-thread figure to a lubricated bolt over-tightens it — sometimes to failure.

Pull smoothly to the click and stop, hold the handle at its marked point, and never use it to loosen fasteners. Store it wound down to its lowest setting to relieve the spring.

A fastener tightened past its elastic limit deliberately, so it stretches permanently. Those bolts are single-use — reusing one that has already yielded risks it failing at a much lower load.

Because most of the applied torque overcomes friction rather than producing clamping force. Lubrication, corrosion and thread damage all change that split substantially.

Tightening to a low torque then turning a specified further angle. It controls bolt stretch directly rather than inferring it through friction, which is far more repeatable.

It determines how the engine feels at different speeds. Peak power sells the car; the shape of the torque curve is what makes it pleasant to drive.

For acceleration, gearing matters as much — a gearbox multiplies torque. That is why a high-revving low-torque engine can out-accelerate a torquey one with taller gearing.