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Columns with a grey background are output.
Fill in all other columns and click the "Calculate" button to use.

Finding Horsepower with Weight and Trap Speed.
Vehicle
Weight (lbs)		 1/4 Mile
Trap MPH		 Your Estimated
Horsepower

Finding Horsepower from Torque and RPM.
Torque
(ft-lbs)		 RPM HP

Finding ET and MPH with Weight and Horsepower.
Vehicle
Weight (lbs)		 Horse-
Power		 Estimated
E.T		 Trap
Speed

Adjusting ET for Elevation.
Old ET (s) Elevation (ft) New ET

Finding RPM with Gear Ratio, Speed, and Tire Size.
OD is your transmission's overdrive ratio. If you do not have overdrive, use "1". If you have overdrive, but don't know the ratio, a good guess is ".7".

Gear
Ratio		 Speed
(MPH)		 OD
(see above)		 Tire
Diam. (in)		 RPM
Alternatively, you may use this calculator if you don't know your tire diameter. Instead, enter the 3 numbers listed on the side of the tire. For example, if the tire says something like "225/50/R16", use 225 for tire width, 50 for aspect ratio, and 16 for rim diameter.

Gear
Ratio		 Speed
(MPH)		 OD
(see above)		 Tire Width
(mm)		 Aspect
Ratio		 Diameter of
rim (in)		 RPM

Correcting Speedometer for New Tires.
Original Tire
Diam. (in)		 New Tire
Diam. (in)		 Speedometer
Reading		 Real
Speed
Formulas for Bore, Stroke Displacement

Finding Displacement with Bore, Stroke, and # of Cylinders
Bore
(inches)		 Stroke
(inches)		 # of
Cyls		 Displace-
ment (ci)		 Displace-
ment (L)

Calculate Cylinder Volume
Bore Stroke Cylinder Volume

Calculate Stroke
Displacement Bore # cylinder Stroke
Formulas for Compression Ratio

Finding Effective Compression with Compression and Boost.
If your motor compression is 9:1, put 9 in the "motor compression" box.

Motor
Compression		 Boost
(psi)		 Effective
Compression

Calculate Chamber Volume
Cylinder Volume Compression Ratio Chamber Volume
Formulas for Fuel Requirements

Fuel Requirements in gallons per hour
This formula will calculate the approximate fuel needs for an engine based on horsepower at wide open throttle. The formula came from the Holley website. It's just a general guideline, but will get you in the ballpark. It says you should use about .5 lbs of fuel per hour per horsepower at wide open throttle.

HP@WOT Results

Fuel Injector Requirements
  • In most cases a naturally aspirated engine will have a B.S.F.C of .50. This means that the engine will use .50 lbs. of fuel per hour for each horsepower it produces. Turbocharged engines will want to be at .60 lbs. per hour or higher.
  • Most injectors will max out at 80% duty cycle and this is the accepted industry standard.

    • HP@WOT BSFC Inj Duty Cycle # of Injectors Results lb/hour

    Max HP by injector size
  • In most cases a naturally aspirated engine will have a B.S.F.C of .50. This means that the engine will use .50 lbs. of fuel per hour for each horsepower it produces. Turbocharged engines will want to be at .60 lbs. per hour or higher.
  • Most injectors will max out at 80% duty cycle and this is the accepted industry standard.

    • Inj lb/hour BSFC Inj Duty Cycle # of Injs Results lb/hour



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