Calculation of cylinder volume  
Cylinder bore (mm)  
Cylinder stroke (mm)  
Number of cylinders  
Cubic capacity (cm^{3}) 
Calculation of ideal runner diameter
Use values from previous calculation 

Cubic capacity (cm^{3})  
Number of cylinders  
Target RPM  
Runner diameter (cm) 
Calculation of runner length
Use values from previous calculation 

Target RPM  
Runner diameter (cm)  
Duration intake valve (degrees)  
Runner length (cm) 
or 
Empty form 