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HP to Torque Formula:
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The HP to Torque formula converts power (horsepower) to torque at a specific rotational speed (RPM). This relationship is fundamental in mechanical engineering and automotive applications for understanding engine performance characteristics.
The calculator uses the HP to Torque formula:
Where:
Explanation: The constant 5252 comes from the fact that 1 horsepower equals 550 foot-pounds per second, and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).
Details: Torque represents rotational force and is crucial for understanding an engine's pulling power, acceleration capability, and overall performance characteristics. It helps engineers and mechanics optimize engine performance and transmission design.
Tips: Enter horsepower in hp and RPM in revolutions per minute. Both values must be positive numbers. The calculator will compute the corresponding torque in pound-feet (lb-ft).
Q1: Why is 5252 the magic number in this formula?
A: 5252 is derived from the conversion between horsepower and torque units. Since 1 hp = 550 ft-lb/sec and there are 60 seconds in a minute, the constant becomes (550 × 60) ÷ (2 × π) ≈ 5252.
Q2: What is the relationship between HP and torque?
A: Horsepower is a measure of power (work over time), while torque is a measure of rotational force. At 5252 RPM, horsepower and torque values are always equal numerically.
Q3: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery, including electric motors, as long as the units are consistent (hp for power, lb-ft for torque).
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 at lower RPM provides better acceleration and towing capacity, while high-RPM horsepower determines top speed potential.