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Performance Calculators

 

RPM calculator

Gear Ratio Tire Radius MPH
RPM =

CFM needed

Engine size (cid) Max RPM Volumetric Efficiency *
CFM Needed =

* 1.0 is a good estimate for a mild performance engine

Horsepower From MPH Calculation:

1/4 Mile
Speed (mph)
Vehicle
Weight (lbs.)
  Horsepower

Liter/CID Conversions:

Liters Cubic Inches

Displacement Calculation:

Bore Stroke # of Cylinders
CID=

Miles per Gallon:

Miles
Travelled
Gallons
Used
  Miles Per Gallon

Kilometers per Liter:

Kilometers
Travelled
Liters
Used
  Kms Per Liter



 




Calculate Engine's Compression Ratio (CR)

Enter Input Unit Type 1=inches 2=mm :
Enter Bore size:

Enter Stroke size:

Enter Head Gasket Bore size:

Enter Compressed Head Gasket Thickness:

Enter Combustion Chamber Volume in CC's:

Enter Piston Dome Volume in CC's use "-" for Dished Pistons:

Enter Piston Deck Clearance    If ABOVE deck use "-" :

           
Compression Ratio:
:1                 Total Volume: cc




Calculate CR from ALL inputs except Total Volume
Calculate Total Volume from Bore, Stroke, and CR -- this is the volume measured with piston ATDC and the head with gasket installed, and valves closed
Calculate Combustion Chamber Volume from ALL inputs except Combustion Chamber Volume and Total Volume
 
 
1/4 Mile to 1/8 Mile ET Conversion
 
Enter your 1/8 Mile ET or 1/4 Mile ET

Enter your 1/8 ET:

Your 1/4 Mile ET is:
 

Enter your 1/4 ET:

Your 1/8 Mile ET is:
Enter the ¼ Mile ET or the 1/8 Mile ET and
Click on Calculate...
FORMULA:
¼ Mile ET = (1/8 Mile ET + .22) / .655
1/8 Mile ET = (¼ Mile ET * .655) - .22

 


 


Estimate MPH from 60 foot time

Enter 60 foot Time:

60 foot MPH:




Conversion Chart


Cubic Inches (ci)
    
    
Liters (L)
    


Cubic Inches (ci)
    
    
Cubic Centimeters (cc)
    


Inches (in)
    
    
Centimeters (cm)
    


Foot Pounds (ft-lbs)
    
    
Inch Pounds (in-lbs)
    


Miles (mi)
    
    
Kilometers (km)
    


Ounces (oz)
    
    
Grams (g)
    


Miles per Hour (mph)
    
    
Kilometers per Hour (kph)
    


Degrees Fahrenheit (F)
    
    
Degrees Celcius (C)
    



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