Velocity Stack Length Calculator

Formula

The formula to calculate the Velocity Stack Length (LS) is:

\[ \text{LS} = \frac{\text{C}}{4 \times \text{N}} \]

Where:

\( \text{LS} \) is the length of the velocity stack (mm)
\( \text{C} \) is the speed of sound in the intake manifold (m/s)
\( \text{N} \) is the engine speed (revolutions per minute)

What is a Velocity Stack?

A velocity stack, also known as an air horn, is a trumpet-shaped device that is part of the air intake system of an internal combustion engine. It is designed to allow smooth airflow into the intake manifold and can improve the engine’s performance by optimizing the air pressure waves within the intake system.

Example Calculation

Let's assume the following values:

Speed of Sound in Intake Manifold (C) = 343 m/s
Engine Speed (N) = 6000 RPM

Using the formula to calculate the Velocity Stack Length:

\[ \text{LS} = \frac{343}{4 \times 6000} = \frac{343}{24000} \approx 0.0143 \text{ mm} \]

The Velocity Stack Length is approximately 0.0143 mm.