1. What is Torque?

Definition: Torque is a measure of the rotational force applied to an object. In automotive and mechanical contexts, it represents the twisting force that causes rotation.

Purpose: This calculator helps determine the torque output of an engine based on its horsepower and RPM values.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower is defined as 550 foot-pounds per second.

3. Importance of Torque Calculation

Details: Torque is crucial for understanding an engine's pulling power and low-end performance. Higher torque at lower RPMs generally means better acceleration and towing capacity.

4. Using the Calculator

Tips: Enter the horsepower value and the RPM at which that horsepower is produced. Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 used in the formula?
A: 5252 is the RPM at which horsepower and torque values cross on a graph (they're equal). This comes from the conversion between foot-pounds per second and horsepower.

Q2: What's the difference between horsepower and torque?
A: Torque measures rotational force, while horsepower measures the rate at which work is done (torque × RPM).

Q3: How does RPM affect torque?
A: Generally, engines produce maximum torque at specific RPM ranges, often in the mid-range for most vehicles.

Q4: Can I use this for electric motors?
A: Yes, the formula works for any rotating machinery, though electric motors often have different torque curves than combustion engines.

Q5: What are typical torque values for cars?
A: Passenger cars might have 100-300 lb-ft, while trucks and performance cars can have 300-1000+ lb-ft of torque.