Fuel Injector Size Calculator

The Fuel Injector Size Calculator helps you determine the right size of the fuel injectors for your engine. Fuel injectors are responsible for delivering fuel into the engine's combustion chambers. If the injectors are too small, the engine won't get enough fuel, which can lead to performance issues. If they are too large, it can result in too much fuel being delivered, causing inefficiency and potential damage.

To calculate the necessary fuel injector size, the calculator uses a specific formula that factors in the estimated maximum horsepower, brake specific fuel consumption (BSFC), and the number of cylinders. Initially, the fuel injector size in pounds per hour (lbs/hr) is derived by multiplying the estimated maximum horsepower by the BSFC, followed by dividing the product by the result of multiplying the number of cylinders by 0.8. The 0.8 factor signifies an 80% duty cycle, a common safety margin that prevents the injectors from constantly operating at full capacity, thereby enhancing reliability and longevity.

Next, to convert the fuel injector size from pounds per hour to cubic centimeters per minute (cc/min), the injector size in lbs/hr is multiplied by 10.5. This conversion factor accounts for the fuel density, translating the fuel flow rate into cc/min.

Ensuring the correct fuel injector size is critical for your engine’s performance and for avoiding fuel-related issues. Proper sizing guarantees that your engine receives the precise amount of fuel necessary for optimal operation.