Matching the Injector to the Engine
To calculate the injector size for a particular application:
Injector Flow Rate (lb/hr) = 
Engine HP(1) x BSFC(2)
Number of Injectors x Injector duty cycle(3) 
Or
Injector Flow Rate (cc/min) = 
Engine HP(1) x BSFC(2) x 10.5
Number of Injectors x Injector duty cycle(3) 
This worksheet can do the calculations for you:
To calculate the horsepower capacity of injectors based on their flow rating:
Fuel injectors max HP (lb/hr)* = 
Injector flow rate x Number of injectors x 0.8
BSFC

Or
Fuel injectors max HP (cc/min)* = 
Injector flow rate x Number of injectors x 0.8
BSFC x 10.5

This worksheet can do the calculations for you:
Injector flow rate conversions:
Fuel injectors flow (lb/hr)* = 
Fuel injector flow (cc/min)
10.5

Fuel injector flow (cc/min)* = 
Fuel injectors flow (lb/hr) x 10.5

This worksheet can do the calculations for you:
Injector flow rate conversions:



*NOTE: This formula take into account a properly functioning fuel delivery system. Damaged components, clogged or modified injectors, insufficient fuel delivery, or other fuel system problems that alter the injector flow rates will render this formula useless! 

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