The horsepower-to-torque ratio is calculated as:
\[ \text{Torque (lb-ft)} = \frac{\text{Horsepower (HP)} \times 5252}{\text{RPM}} \]
The horsepower-to-torque ratio is a measure of the engine's performance. It is calculated by dividing the product of horsepower and 5252 by the engine's RPM. This ratio helps in understanding the engine's efficiency and power output.
Consider an engine with a horsepower of 300 HP and an RPM of 4000:
Using the formula:
\[ \text{Torque (lb-ft)} = \frac{300 \times 5252}{4000} = 393.9 \text{ lb-ft} \]
This means the engine has a torque of 393.9 lb-ft.