1. What is a Torque Calculator with Power?

Definition: This calculator estimates the torque produced by an engine based on its power (horsepower) and rotational speed (RPM).

Purpose: It helps automotive professionals, engineers, and enthusiasts understand engine performance characteristics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (pound-feet)
• \( HP \) — Power (horsepower)
• \( RPM \) — Rotational speed (revolutions per minute)

Explanation: The constant 5252 comes from the relationship between horsepower and torque, where they intersect at 5252 RPM in the horsepower-torque curve.

3. Importance of Torque Calculation

Details: Torque represents rotational force and is crucial for understanding an engine's pulling power, acceleration, and towing capacity.

4. Using the Calculator

Tips: Enter the power in horsepower and rotational speed in RPM. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 a special number in this calculation?
A: 5252 RPM is where horsepower and torque values intersect because of the mathematical relationship between these units (1 HP = 550 ft-lb/sec).

Q2: What's a typical torque value for cars?
A: Passenger cars typically produce 100-300 lb-ft, while trucks and performance vehicles can produce 300-1000+ lb-ft.

Q3: Can I use this for electric motors?
A: Yes, but electric motors often produce maximum torque at 0 RPM, so this formula is most useful at operating speeds.

Q4: How does torque relate to acceleration?
A: Higher torque at lower RPM generally means better acceleration from a stop.

Q5: What if I know kW instead of HP?
A: First convert kW to HP (1 kW ≈ 1.341 HP) before using this calculator.