Big Boyz Head Porting - Twin Cam and EVO Gear Ratio Calculator


Big Boyz Head Porting  

 

                           
  Transmission, Primary and Secondary Drive Ratio Comparator  
   
         
     
  Measured Wheel Diameter   inches  
       
  Select Year         
           
  Optional Transmission       
           
      Leave at 0 to use preselects  
  Engine Sprocket   Teeth Alternates Over-ride preselected Values    
  Clutch Sprocket   Teeth    
  Trans Pulley/Sprkt   Teeth  
  Rear Pulley/Sprkt   Teeth  
     
      Gear Ratio   Alternate Gear Ratio  
    1st     
    2nd    Alternates Over-ride preselected Values  
    3rd     
    4th     
    5th     
    6th       
         
  Overall Drive Ratio   Drive Ratio   Travel Speed MPH  
  1st   Primary   1st  
  2nd   Secondary   2nd    
  3rd   3rd  
  4th Engine RPM's  to MPH >>> 4th  
  5th         5th  
  6th   6th  
         
  6th  
  5th  
  4th  
  3rd  
  2nd  
  1st  
  RPM 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000  
         
         
                         
                         
                         
                         
                         
                         
                         
                         
           
                       
                       
                       
                       
                       
                       
                       
                       
                       
             
             
  This calculator is supplied as a convenience and intended to be used for estimates only.  We make no warranties, implied or expressed, to the accuracy of any data or calculations presented here.  
   
   
         










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