Supercharger RPM Calculator

Supercharger RPM Formula

To calculate the supercharger RPM, use the following formula:

\[ \text{SCRPM} = \frac{\text{CD}}{\text{SCD}} \times \text{ERPM} \]

where:

• SCRPM: Supercharger RPM
• CD: Crank pulley diameter (inches)
• SCD: Supercharger pulley diameter (inches)
• ERPM: Engine RPM

Example Calculation

Let's assume a crank pulley diameter of 7 inches, a supercharger pulley diameter of 3.5 inches, and an engine RPM of 5000.

\[ \text{SCRPM} = \frac{7}{3.5} \times 5000 = 2 \times 5000 = 10000 \]

Thus, the supercharger RPM is 10000.

What Is a Supercharger RPM?

A supercharger RPM is the speed at which a supercharger spins, depending on the crank pulley to supercharger pulley ratio and the engine RPM. The higher the ratio between the crank pulley and the supercharger pulley, the faster the supercharger will rotate compared to the engine.

Common FAQs

How does a supercharger affect engine performance?

• A supercharger forces more air into the engine's intake, increasing the amount of oxygen available for combustion. This results in more power output and increased engine performance.

Why is the pulley ratio important?

• The pulley ratio determines how quickly the supercharger spins relative to the engine RPM. A higher ratio means the supercharger will spin faster, increasing the boost provided to the engine.

Can a supercharger RPM be too high?

• Yes, a supercharger can be overspun, leading to potential damage or reduced efficiency. It's crucial to operate within the manufacturer's specified RPM range to ensure longevity and optimal performance.