Fuel Injector Flow Rate Calculator

The “Fuel Injector Flow Rate Calculator” tool is a web-based application designed to help users calculate the flow rate of fuel injectors.

Fuel Injector Flow Rate Calculator Tool

Calculate the Brake-Specific Fuel Consumption

Here’s a table showcasing average Brake Specific Fuel Consumption (BSFC) values for different types of engines:

Engine TypeBSFC (lb/hp/hr)BSFC (g/kWh)
Gasoline0.45 – 0.50270 – 300
Diesel0.35 – 0.40210 – 240
Turbocharged0.50 – 0.60300 – 360
Supercharged0.55 – 0.65330 – 390
Natural Gas0.35 – 0.45210 – 270
LPG0.50 – 0.55300 – 330
Methanol0.35 – 0.45210 – 270
Ethanol0.45 – 0.50270 – 300

How to Find the Right Fuel Injector Flow Rate

Finding the right fuel injector flow rate involves considering several factors and making calculations based on the specific requirements of your engine. Here’s a general approach to finding the right fuel injector flow rate:

  1. Determine the desired horsepower: Start by determining the horsepower you want your engine to produce. This will serve as a basis for calculating the fuel flow needed.
  2. Calculate the fuel flow rate: To calculate the fuel flow rate, divide the desired horsepower by the Brake Specific Fuel Consumption (BSFC) value. BSFC represents the amount of fuel consumed per unit of power generated. It is typically measured in pounds of fuel per hour per horsepower (lb/hr/hp) or grams of fuel per kilowatt-hour (g/kWh).Fuel Flow Rate = Desired Horsepower / BSFC
  3. Consider the fuel pressure: Take into account the fuel pressure your system operates at. Fuel injectors have different flow rates depending on the pressure. Ensure that the injector flow rate specification corresponds to the fuel pressure you are using. If not, you may need to apply a correction factor or choose a different injector.
  4. Calculate the injector duty cycle: The duty cycle represents the percentage of time the injectors are open in relation to the total available time. Calculate the injector duty cycle using the following formula:Injector Duty Cycle (%) = (Fuel Flow Rate / (Number of Injectors * Injector Flow Rate)) * 100The number of injectors refers to the total number of injectors in your engine setup.
  5. Select appropriate fuel injectors: Based on the calculated fuel flow rate and injector duty cycle, choose fuel injectors that can meet the required flow rate at the specified duty cycle. Consult manufacturer specifications and consider factors such as injector impedance, spray pattern, and compatibility with your engine management system.