Formulas for Fuel Requirements

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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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