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 Motor Math

 

RPM calculator
Gear Ratio Tire Diameter MPH
RPM =

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

* Normally aspirated. 100% is a good estimate for a race engine. If intake system is
restrictive, use a smaller %.

Horsepower From MPH Calculation:
1/4 Mile
Speed (mph)		 Vehicle
Weight (lbs.)		   Rear Wheel Horsepower
(STILL NOT ENOUGH!)

Liter/CID Conversions:
Liters Cubic Inches

Displacement Calculation:
Bore Stroke # of Cylinders
CID=

Miles per Gallon:
Miles
Traveled		 Gallons
Used		   Miles Per Gallon

Kilometers per Liter:

Kilometers
Traveled		 Liters
Used		   Km Per Liter


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