1. What is Torque from Horsepower and RPM?

Definition: This calculator determines the torque produced by an engine based on its horsepower and revolutions per minute (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:

• \( T \) — Torque (pound-feet)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute

Explanation: The constant 5252 comes from the relationship between rotational speed and power, where horsepower and torque are equal at 5252 RPM.

3. Importance of Torque Calculation

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

4. Using the Calculator

Tips: Enter the engine's horsepower and RPM (must be greater than 0). The calculator will output torque in pound-feet.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number in this formula?
A: It's the RPM where horsepower and torque (in lb-ft) are numerically equal, derived from the relationship between rotational speed and power.

Q2: What's more important - horsepower or torque?
A: Both matter: torque determines pulling power, while horsepower (which includes RPM) determines top speed and sustained performance.

Q3: Can I use this for electric motors?
A: Yes, the formula works for any rotational power source, though electric motors often have different torque curves than combustion engines.

Q4: How does torque relate to vehicle acceleration?
A: Higher torque at lower RPMs typically means better initial acceleration, while horsepower affects higher-speed performance.

Q5: What's a typical torque value for passenger cars?
A: Most passenger cars produce 100-300 lb-ft of torque, with performance vehicles reaching 400-800 lb-ft.