1. What is a Torque Converter Stall Speed Calculator?

Definition: This calculator estimates the stall speed of a torque converter based on input torque, moment of inertia, and a converter-specific constant.

Purpose: It helps automotive engineers and technicians determine the RPM at which a torque converter will stall under load.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( N_s \) — Stall speed (rpm)
• \( k \) — Converter-specific constant (dimensionless)
• \( T \) — Input torque (Nm)
• \( I \) — Moment of inertia (kg·m²)

Explanation: The stall speed is proportional to the square root of the torque-to-inertia ratio, scaled by a converter-specific constant.

3. Importance of Stall Speed Calculation

Details: Proper stall speed estimation is crucial for vehicle performance tuning, transmission design, and ensuring optimal power transfer from the engine.

4. Using the Calculator

Tips: Enter the input torque in Nm, moment of inertia in kg·m², and converter constant (default 1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for constant k?
A: Most torque converters have constants between 0.8 and 1.2, depending on design and fluid coupling characteristics.

Q2: How do I find the moment of inertia?
A: It can be calculated from the rotating mass and its distribution, or measured using specialized equipment.

Q3: What affects stall speed most significantly?
A: The torque input has the greatest effect, as stall speed is proportional to the square root of torque.

Q4: Why is stall speed important?
A: It determines the RPM range where maximum torque multiplication occurs, affecting launch performance and drivability.

Q5: Does this calculation account for fluid dynamics?
A: The constant k incorporates fluid coupling effects, but detailed analysis would require more complex modeling.