Enter the peak torque RPM into the Intake Runner Length Calculator. The calculator will evaluate the Intake Runner Length.

- All Length Calculators
- Crank Length Calculator
- Shock Length Calculator
- Pushrod Length Calculator
- Engine Torque Calculator

## Intake Runner Length Formula

The following two example problems outline the steps and information needed to calculate the Intake Runner Length.

IRL = 17.8 + ((10-PT/1000)*4.3)

- Where IRL is the Intake Runner Length (cm)
- PT is the peak torque RPM

## How to Calculate Intake Runner Length?

The following example problems outline how to calculate Intake Runner Length.

Example Problem #1:

- First, determine the peak torque RPM.
- The peak torque RPM is given as: 4000.

- Finally, calculate the Intake Runner Length using the equation above:

IRL = 17.8 + ((10-PT/1000)*4.3)

The values provided above are inserted into the equation below and computed.

IRL = 17.8 + ((10-4000/1000)*4.3) = 43.6 (cm)

Example Problem #2:** **

For this problem, the variables required are provided below:

peak torque RPM = 5000

Test your knowledge using the equation and check your answer with the calculator..

IRL = 17.8 + ((10-PT/1000)*4.3)** = ?**