1. What is the Relation Between Torque and RPM?

Definition: This calculator determines the horsepower produced based on torque and rotational speed (RPM).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( T \) — Torque (pound-feet)
• \( RPM \) — Rotations per minute
• 5252 — Conversion constant

Explanation: The formula shows that horsepower is directly proportional to both torque and RPM. The constant 5252 comes from the conversion between rotational and linear power.

3. Importance of Torque-RPM Relationship

Details: Understanding this relationship helps in engine tuning, performance analysis, and comparing different engines.

4. Using the Calculator

Tips: Enter torque in pound-feet and RPM. Both values must be positive numbers. The result shows the horsepower at that specific RPM.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number?
A: It's the RPM at which torque and horsepower values are equal (when using lb-ft and HP units), derived from unit conversions.

Q2: Can I use this for electric motors?
A: Yes, the formula applies to any rotating machinery, including electric motors.

Q3: What's a typical torque value for cars?
A: Passenger cars typically produce 100-300 lb-ft, while performance cars can exceed 500 lb-ft.

Q4: How does RPM affect horsepower?
A: Generally, horsepower increases with RPM until engine efficiency declines at very high RPMs.

Q5: What if I have Nm instead of lb-ft?
A: First convert Nm to lb-ft (1 Nm = 0.7376 lb-ft) before using this calculator.