Flow Calculator

Injector Flow Conversion

Convert cc/min to lbs/hr

Convert lbs/hr to cc/min

Selecting the Correct Size Injector

Fuel Injector Size Calculator
Horsepower (at flywheel)
Number of Injectors
B.S.F.C. *

Max Duty Cycle in % **

Required Injector Static Flow Rate @ 43.5 psi lb/hr


This calculator will assist you in determining what size fuel injector to use.

* Brake Specific Fuel Consumption: is the amount of fuel consumed (in lbs. per hour) for each horsepower made. This should be .45 to .50 for naturally aspirated engines, .55 to .60 for supercharged engines, and .60 to .65 for turbocharged engines.
** Maximum Injector Duty Cycle should be around 80% max for safe operation. This allows for some future horsepower increases.