Calculate intake and exhaust port air velocities based on valve size, lift, and engine speed for optimal flow.
Input Parameters
Results
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Valve Curtain Area
mm²
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Port Velocity
m/s
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Mach Index
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Lift/Dia Ratio
Note: Mach Index above 0.6 indicates choked flow and power loss. Ideal L/D ratio is 0.25-0.30 for maximum flow coefficient. SAE paper 2001-01-2030 covers port flow analysis.
Reference
Curtain Area = pi × Valve_dia × Valve_lift
Mean Piston Speed = 2 × Stroke × RPM / 60
Port Velocity = MPS × (Piston_area / Curtain_area)
Mach Index = Port_velocity / Speed_of_sound (343 m/s)
L/D Ratio = Valve_lift / Valve_diameter