last update 2025/07/19
Weber DCOE
Runner/Stacks calculator
Engine capacity
ccm
?
Total engine displacement.
Count of Cylinders
cyl
?
Number of cylinders.
Target RPM
rpm
?
RPM where you want the intake resonance to match.
Engine Power
HP
?
Optional. If filled, it is used to estimate VE.
Engine Torque
Nm
?
Optional. If filled and HP is empty, HP is computed from torque and RPM.
Runner length valve to flange
mm
?
Distance from intake valve to carb flange (without carb).
Runner diameter
mm
?
Runner diameter. Used for throat speed and recommendations.
Valve diameter
mm
?
Intake valve head diameter (optional). Used for throat speed and recommendations.
Intake opens
deg
?
IO - opening of intake valve in degrees BTDC.
Intake closes
deg
?
IC - closing of intake valve in degrees ABDC.
Intake Air Temperature
°C
?
Temperature of intake air used for speed of sound correction.
Relative humidity
%
?
Relative humidity of intake air.
Altitude above sea level
meters
?
Altitude affects air pressure and tuning slightly.
?
Calculate for torque
Calculate for torque and driveability.
?
Calculate for power
Calculate for top end power.