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Torque Formula:
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The torque formula calculates rotational force from horsepower and RPM. It is a fundamental equation in mechanical engineering and automotive applications, representing the twisting force that causes rotation.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute (550 × 60 / 2π ≈ 5252).
Details: Torque calculation is essential for engine performance analysis, transmission design, vehicle acceleration prediction, and mechanical system optimization. It helps engineers understand the rotational force available at different engine speeds.
Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the torque in pound-feet (lb-ft).
Q1: Why is 5252 used in the formula?
A: 5252 is a conversion constant derived from the definition of horsepower (1 HP = 550 ft-lb/s) and the relationship between angular velocity and RPM.
Q2: What is the relationship between torque and horsepower?
A: Horsepower is a function of torque and RPM. At 5252 RPM, torque and horsepower are numerically equal. Below this RPM, torque is higher than HP; above it, HP is higher.
Q3: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery, including electric motors, internal combustion engines, and turbines.
Q4: What are typical torque values for automotive engines?
A: Typical passenger car engines produce 100-400 lb-ft of torque, while heavy-duty diesel engines can produce over 1000 lb-ft.
Q5: How does torque affect vehicle performance?
A: Higher torque provides better acceleration and towing capacity, while the torque curve shape affects drivability across the RPM range.