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

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:

  1. First, determine the peak torque RPM. 
    • The peak torque RPM is given as: 4000.
  2. 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) = ?