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Exhaust Length Calculator

Formula

To calculate the Optimal Exhaust Length ( $L$ ):

$L = \left(\frac{c}{2 \times N}\right) \times 60$

Where:

$L$ is the optimal exhaust length (meters)
$c$ is the speed of sound in the exhaust medium (meters per second)
$N$ is the engine speed (revolutions per minute)

What is Exhaust Length?

Exhaust length is the distance from the exhaust valve to the end of the exhaust system. The optimal length can improve engine performance by enhancing the scavenging effect, which helps remove exhaust gases and draw in fresh air. This calculation is particularly useful for performance tuning in racing applications.

Example Calculation 1

Let's assume the following values:

Speed of Sound ( $c$ ) = 343 m/s
Engine Speed ( $N$ ) = 6000 RPM

Using the formula:

$L = \left(\frac{343}{2 \times 6000}\right) \times 60 = 1.72 \text{ meters}$

The optimal exhaust length is 1.72 meters.

Example Calculation 2

Let's assume the following values:

Speed of Sound ( $c$ ) = 340 m/s
Engine Speed ( $N$ ) = 7000 RPM

Using the formula:

$L = \left(\frac{340}{2 \times 7000}\right) \times 60 = 1.46 \text{ meters}$

The optimal exhaust length is 1.46 meters.