Intake Runner and Peak Torque Calculator



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Intake Port to Torque Peak

  • Long Port Length: Improve low RPM range
  • Short Port Length: Improve high RPM range
  • Large Cross Section: Works better on larger CID and higher RPM
    • Too large of a cross section can cause reversion and less power
  • Small Cross Section: Works better on smaller CID and lower RPM
    • Smallest cross section without losing HP is the best size


Calculate Peak Torque RPM
    To find the rpm at which peak torque occurs for a given intake runner / engine.
Engine Displacement (cubic inches only)
cubic inches
Number of Cylinders
Intake runner area
square inches
Peak Torque RPM
RPM (calculated)

Calculate Optimum Runner Size and Length
    To find the optimum intake runner area and length for a particular rpm.
Engine Displacement (cubic inches only)
cubic inches
Number of Cylinders
Peak Torque RPM
RPM
# of Induction Wave
(sound waves)
Adv. Cam Duration
Degrees
Optimum Intake runner area
square inches (calculated)
Optimum Intake Length
inches long (from valve head to plenum).


Intake Runner Area to Engine Size Match
    To calculate the engine displacement to match peak rpm and intake runner size
Number of Cylinders
Desired Peak Torque RPM
RPM
Intake runner area
square inches
Target Engine Displacement (cubic inches )
cubic inches (calculated)








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