1. What is the Torque to HP Formula?

The formula HP = (T × RPM) / 5252 calculates horsepower from torque and RPM. This equation is fundamental in automotive and mechanical engineering for determining engine power output.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower (hp)
• \( T \) — Torque (lb-ft)
• \( RPM \) — Revolutions per minute (rpm)
• 5252 — Conversion constant

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

3. Importance of HP Calculation

Details: Accurate horsepower calculation is crucial for evaluating engine performance, comparing different engines, and understanding power delivery characteristics in automotive applications.

4. Using the Calculator

Tips: Enter torque in lb-ft and RPM values. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between different units of measurement (foot-pounds per minute to horsepower) and represents the point where torque and horsepower curves intersect.

Q2: What are typical torque and RPM values for car engines?
A: Typical values vary by engine type: gasoline engines might produce 150-400 lb-ft torque at 2000-6000 RPM, while diesel engines often have higher torque at lower RPM.

Q3: Can this formula be used for electric motors?
A: Yes, the formula applies to electric motors as well, though electric motors typically have different torque curves compared to internal combustion engines.

Q4: How does gear ratio affect horsepower calculation?
A: Gear ratios affect torque multiplication but not the actual horsepower output. Horsepower remains constant through gear changes (ignoring efficiency losses).

Q5: What's the difference between brake horsepower and wheel horsepower?
A: Brake horsepower (BHP) is measured at the engine crankshaft, while wheel horsepower (WHP) is measured at the wheels and accounts for drivetrain losses (typically 10-20% less than BHP).