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Generally, NM (Newton Meter) is a force times the length of the arm. Bar is Pressure (force per unit of area). The conversion is not possible to calculate because of the difference in extensions (NM or N/m²).

However, in engine design the load of the engine can be given in bar (cylinder pressure) but converted into torque (N-m) by the following conversion: Cylinder Pressure (bar) =

Torque (N-m) * nrev * 2 * pi / Cylinder displacement (cubic meters) / 100,000

where: nrev = number of revolutions per cycle (2 for a 4-stroke engine, 1 for a 2-stroke)

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