1. What is the Power Formula in Engine?

Definition: This formula calculates the horsepower of an engine based on its torque and rotational speed (RPM).

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

2. How Does the Formula Work?

The formula is:

Where:

• \( HP \) — Horsepower (output power)
• \( T \) — Torque (pound-feet)
• \( RPM \) — Rotations per minute
• 5252 — Conversion constant (derived from units conversion)

Explanation: The formula shows the direct relationship between torque and RPM in determining an engine's power output.

3. Importance of Power Calculation

Details: Understanding engine power helps in vehicle design, performance tuning, and comparing different engines.

4. Using the Calculator

Tips: Enter the torque in pound-feet and the engine speed in RPM. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the constant?
A: It comes from the conversion between foot-pounds per minute to horsepower (1 HP = 550 ft-lb/sec = 33,000 ft-lb/min).

Q2: What's a typical torque value for cars?
A: Passenger cars typically have 100-300 lb-ft, while trucks may have 400-1000 lb-ft.

Q3: Does this work for electric motors?
A: Yes, the formula applies to any rotational power source, including electric motors.

Q4: Why do HP and torque curves cross at 5252 RPM?
A: Because at this RPM, HP numerically equals torque due to the constant in the formula.

Q5: How accurate is this calculation?
A: It gives theoretical power at the crankshaft; actual wheel horsepower is lower due to drivetrain losses.