1. What is the Torque Formula with RPM?

Definition: This calculator computes the torque produced by an engine based on its horsepower and RPM (revolutions per minute).

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
• 5252 — Conversion constant (derived from the relationship between rotational speed and power)

Explanation: The formula shows that torque and horsepower are directly related through RPM, with the crossover point always occurring 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 values. Both must be greater than zero for calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number in the formula?
A: It comes from the conversion between rotational speed (RPM) and angular velocity (radians/second), where 1 HP = 550 ft-lb/sec and there are 2π radians per revolution.

Q2: What's more important - horsepower or torque?
A: Both are important. Torque determines pulling power, while horsepower (which includes RPM) determines how fast work can be done.

Q3: Does this formula work for electric motors?
A: Yes, the same formula applies to any rotating machinery, 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 generally means better initial acceleration, while high horsepower at higher RPMs affects top speed.

Q5: Can I calculate horsepower if I know torque and RPM?
A: Yes, the formula can be rearranged: \( HP = \frac{T \times RPM}{5252} \)