How To Calculate Stall Speed Torque Converter

Stall Speed Formula:

\[ \text{Stall Speed} = K \times \sqrt{\frac{T_{\text{engine}}}{\text{inertia}}} \]

Stall Speed:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What Is Stall Speed Torque Converter?

Stall speed is the maximum speed at which a torque converter can operate when the output shaft is completely stopped while the input shaft is rotating. It represents the point where the torque converter transfers maximum torque multiplication.

2. How Does The Calculator Work?

The calculator uses the stall speed formula:

\[ \text{Stall Speed} = K \times \sqrt{\frac{T_{\text{engine}}}{\text{inertia}}} \]

Where:

\( K \) — Dimensionless coefficient specific to the torque converter
\( T_{\text{engine}} \) — Engine torque in Newton-meters (Nm)
\( \text{inertia} \) — Rotational inertia in kilogram square meters (kg m²)

Explanation: The formula calculates the maximum RPM at which the torque converter can operate when the output is stalled, based on the engine torque, system inertia, and converter characteristics.

3. Importance Of Stall Speed Calculation

Details: Proper stall speed calculation is crucial for vehicle performance optimization, ensuring the torque converter matches the engine's power band, and preventing transmission damage from improper matching.

4. Using The Calculator

Tips: Enter the K coefficient (typically provided by the manufacturer), engine torque in Nm, and rotational inertia in kg m². All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for torque converters?
A: K values typically range from 1800-2500 for most automotive applications, but vary significantly based on converter design and application.

Q2: How does stall speed affect vehicle performance?
A: Higher stall speeds allow the engine to reach its power band faster, improving acceleration but potentially reducing fuel efficiency at lower speeds.

Q3: Can I calculate stall speed without knowing the K value?
A: No, the K value is specific to each torque converter design and must be obtained from the manufacturer or through testing.

Q4: What happens if stall speed is too high?
A: Excessively high stall speeds can cause overheating, reduced fuel efficiency, and increased wear on transmission components.

Q5: How does inertia affect stall speed?
A: Higher rotational inertia requires more torque to overcome, resulting in a lower stall speed for the same engine torque and K value.