Fuel Injector Sizing Calculator
Determine the correct fuel injector size for your engine based on power output, cylinder count, and fuel type.
NA: 0.45-0.50, Turbo: 0.55-0.60
80% recommended, 85% max safe
Fuel Injector Sizing Results
Total Fuel Flow Required
200.0 lb/hr
Flow Per Cylinder
50.0 lb/hr
Required Injector Size
62.5 lb/hr
Required Size (cc/min)
656 cc/min
Recommended Injector
750 cc/min
(71.4 lb/hr)
Actual Duty Cycle
70.0%
HP Per Cylinder
100 HP
Impedance Type
Low Impedance (1-3 ohms) - requires resistor box or peak-hold driver
Spray Pattern
Standard 4-hole pattern sufficient
Injector Selection Tips
- Duty Cycle: Keep below 85% to prevent overheating and maintain linearity
- Matched Sets: Always use flow-matched injector sets for consistent cylinder-to-cylinder fueling
- E85: Requires approximately 40% more flow than gasoline
- Low Impedance: Injectors over 600cc typically require special ECU drivers