N·m
rpm
Result
Power130.17 kW
Power (mechanical hp)174.6
Power (metric PS / CV)177.0
How it is calculated, with your numbers
- Power
kw = torque × rpm × 2 × π / 60000113 × 11,000 × 2 × π / 60000 = 130.17 kW - Power (mechanical hp)
hp = torque × rpm × 2 × π / 60000 × 1.34102209113 × 11,000 × 2 × π / 60000 × 1.34102209 = 174.6 - Power (metric PS / CV)
ps = torque × rpm × 2 × π / 60000 × 1.35962162113 × 11,000 × 2 × π / 60000 × 1.35962162 = 177.0
Working uses the metric units the formula is written in.
- torque Torque (N·m)
- rpm Engine speed (rpm)
- kw Power
- hp Power (mechanical hp)
- ps Power (metric PS / CV)
What it means
Power is torque times rotational speed. With torque in newton-metres and speed in radians per second the answer is in watts; one revolution per minute is 2π/60 radians per second. In imperial units the same relation becomes hp = lb·ft × rpm / 5252, which is why torque and horsepower curves always cross at 5,252 rpm.
European spec sheets often use PS (metric horsepower), which is about 1.4% more than mechanical hp for the same engine.
Assumptions and limits
- Torque and rpm at the same point on the curve.
Sources
- Heywood, J. B., Internal Combustion Engine Fundamentals, McGraw-Hill, 1988.
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