Fuel Injector Flow Rate (cc/min & lb/hr) Sizing Calculator (HP & Duty Cycle)
Calculate required fuel injector flow rate in cc/min and lb/hr per injector for target engine horsepower, naturally aspirated vs turbocharged induction (BSFC), safe 85% duty cycle, and E85 ethanol compatibility.
Required Injector Flow Rate (cc/min)
Calculator Inputs
Required Injector Flow Rate (cc/min)
Injector Flow Rate in Pounds per Hour (lb/hr)
Required Injector Flow Rate for E85 Fuel (cc/min)
Injector Sizing Comparison: Standard Gasoline vs E85 Ethanol (cc/min)
Standard internal combustion tuning formula compliant with Bosch Motorsport, DeatschWerks, and Injector Dynamics engineering standards.
This calculator is designed for educational and informational purposes based on publicly declared statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimates. Always verify with the relevant official authorities or a certified professional advisor.
Calculation Methodology
Flow Rate (lb/hr) = (Crank HP * BSFC * Fuel Multiplier) / (Number of Cylinders * (Duty Cycle / 100)). Flow Rate (cc/min) = lb/hr * 10.5. BSFC: Naturally Aspirated = 0.50, Turbocharged = 0.62. E85 multiplier = 1.30.
Frequently Asked Questions
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