Vortech Supercharger RPM Calculator Tool

Supercharger RPM Formula:

\[ \text{Supercharger RPM} = \text{Engine RPM} \times \left(\frac{\text{Crank Pulley}}{\text{Super Pulley}}\right) \times \text{Step Up} \]

Engine RPM:

rpm

Crank Pulley:

Super Pulley:

Step Up:

decimal

Supercharger RPM:

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1. What is Supercharger RPM?

The supercharger RPM is the rotational speed of the supercharger impeller, which determines how much air the supercharger can force into the engine. Proper supercharger RPM is critical for optimal performance and avoiding damage to the supercharger.

2. How Does the Calculator Work?

The calculator uses the supercharger RPM formula:

\[ \text{Supercharger RPM} = \text{Engine RPM} \times \left(\frac{\text{Crank Pulley}}{\text{Super Pulley}}\right) \times \text{Step Up} \]

Where:

\( \text{Engine RPM} \) — Engine revolutions per minute
\( \text{Crank Pulley} \) — Diameter of crankshaft pulley (inches)
\( \text{Super Pulley} \) — Diameter of supercharger pulley (inches)
\( \text{Step Up} \) — Gear ratio of the supercharger (typically 3.45-4.10 for Vortech)

Explanation: The pulley ratio (crank/super) multiplied by engine RPM gives the input shaft speed, which is then multiplied by the internal step-up ratio of the supercharger.

3. Importance of Supercharger RPM

Details: Vortech superchargers typically have a maximum safe RPM (often around 50,000-55,000 rpm). Exceeding this can cause bearing failure or impeller damage. Proper pulley selection is crucial for keeping the supercharger within its operating range.

4. Using the Calculator

Tips: Enter your engine's maximum RPM, the diameters of both pulleys (measure outer groove diameter), and the supercharger's step-up ratio (found in manufacturer specs). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical Vortech supercharger RPM range?
A: Most Vortech superchargers operate between 30,000-52,000 RPM, with maximums around 55,000 RPM. Check your specific model's specifications.

Q2: How do I measure pulley diameters?
A: Measure the outer diameter of the pulley groove where the belt rides. For accuracy, use calipers and measure multiple points.

Q3: What if my calculated RPM is too high?
A: You'll need to either reduce engine RPM (rev limit), increase supercharger pulley size, or decrease crank pulley size.

Q4: Does belt slip affect actual RPM?
A: Yes, belt slip can reduce actual supercharger RPM by 5-15%. This calculator shows theoretical RPM without slip.

Q5: What's the step-up ratio for my Vortech?
A: Common Vortech step-up ratios are 3.45:1, 3.60:1, or 4.10:1. Check your model's documentation or contact Vortech.