Intake Runner Length Calculator

Formula

The formula to calculate the Intake Runner Length (IRL) is:

\[ IRL = 17.8 + \left( \left( 10 - \frac{PT}{1000} \right) \cdot 4.3 \right) \]

Where:

Intake Runner Length (IRL): The length of the intake runner, measured in centimeters.
Peak Torque RPM (PT): The engine speed at which peak torque is achieved, measured in revolutions per minute (RPM).

Let's say the peak torque RPM (PT) is 5000. Using the formula:

\[ IRL = 17.8 + \left( \left( 10 - \frac{5000}{1000} \right) \cdot 4.3 \right) \]

We get:

\[ IRL = 17.8 + \left( \left( 10 - 5 \right) \cdot 4.3 \right) = 17.8 + (5 \cdot 4.3) = 17.8 + 21.5 = 39.3 \text{ cm} \]

So, the intake runner length is approximately 39.3 cm.