1. What is Supercharger Speed?

Supercharger speed refers to the rotational speed of the supercharger's impeller, measured in revolutions per minute (rpm). It's a critical parameter for determining the boost pressure and air delivery of a forced induction system.

2. How Does the Calculator Work?

The calculator uses the supercharger speed equation:

Where:

• \( \text{Engine RPM} \) — Engine revolutions per minute
• \( \text{Drive Ratio} \) — Pulley ratio between crankshaft and supercharger
• \( \text{Internal Ratio} \) — Internal gear ratio of the supercharger

Explanation: The equation calculates how fast the supercharger is spinning based on engine speed and the mechanical ratios in the drive system.

3. Importance of Supercharger Speed Calculation

Details: Proper supercharger speed is crucial for optimal boost pressure, engine performance, and preventing overspeed damage to the supercharger components.

4. Using the Calculator

Tips: Enter engine RPM (typically 500-8000 rpm), drive ratio (commonly 1.5-3.5), and internal ratio (typically 1.0 for direct drive or up to 4.0 for geared superchargers). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical supercharger speed range?
A: Most superchargers operate between 10,000-60,000 rpm, with roots-type typically lower and centrifugal-type typically higher.

Q2: How does supercharger speed affect boost?
A: Generally, higher speeds create more boost, but efficiency drops at extreme speeds due to heat and parasitic losses.

Q3: What happens if supercharger speed is too high?
A: Excessive speed can cause bearing failure, impeller damage, or catastrophic supercharger failure from centrifugal forces.

Q4: How do I find my supercharger's internal ratio?
A: Consult manufacturer specifications - it's often 1:1 for roots-type but can be higher for twin-screw or centrifugal designs.

Q5: Can I use this for turbochargers?
A: No, turbocharger speed depends on exhaust gas flow and isn't directly coupled to engine RPM like a supercharger.