Engine Intake Diameter Calculator

Calculate the optimal engine intake diameter based on engine displacement, bore, and stroke dimensions. This calculator helps determine the appropriate size for intake ports and components.

Input Parameters

Calculation Results

Calculation Formula

Intake Diameter (mm) = √(Engine Displacement (cc) × 10² / (π × Bore² × Stroke × RPM))

Where:
π = Pi (approximately 3.14159)
Engine Displacement (cc) = Engine volume in cubic centimeters
Bore (mm) = Cylinder diameter in millimeters
Stroke (mm) = Piston travel distance in millimeters
RPM = Revolutions per minute

Engine Intake Diameter Calculator Calculator Usage Guide

Learn how to use the Engine Intake Diameter Calculator and understand its working principles

How to Use This Calculator

  1. Enter your engine's displacement in cubic centimeters (CC)
  2. Input the bore diameter of your engine in millimeters (mm)
  3. Provide the stroke length of your engine in millimeters (mm)
  4. Specify the maximum RPM your engine reaches
  5. Click the "Calculate" button to compute the optimal intake diameter

Understanding the Results

  • Intake Diameter (mm): The recommended diameter for your engine's intake ports
  • Port Area (cm²): The cross-sectional area of the intake port
  • Gas Velocity (m/s): The speed at which gas flows through the intake port at maximum RPM

Important Notes

This calculator provides a basic estimation for intake diameter. For precision applications, consider additional factors such as:

  • Engine operating conditions (idle, part-throttle, full-throttle)
  • Induction system restrictions
  • Material properties of intake components
  • Advanced flow dynamics

The formula used assumes ideal gas flow conditions and may need adjustment for real-world applications. For professional engine building projects, consult with experienced engineers or refer to specialized flowbench data.