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.

The formula for the fuel injector calculator computes the required fuel injector size based on the estimated maximum horsepower, brake specific fuel consumption (BSFC), and the number of cylinders. First, the fuel injector size in pounds per hour (lbs/hr) is calculated by multiplying the estimated maximum horsepower by the BSFC and then dividing by the product of the number of cylinders and 0.8.

The 0.8 factor represents an 80% duty cycle, which is a common safety margin used to ensure the injectors are not working at their maximum capacity all the time, allowing for reliability and longevity. Then, the fuel injector size in cubic centimeters per minute (cc/min) is obtained by multiplying the injector size in pounds per hour by 10.5. The number 10.5 is a conversion factor that translates the fuel flow rate from pounds per hour (lbs/hr) to cubic centimeters per minute (cc/min), taking into account the density of the fuel.

Proper fuel injector sizing ensures that your engine gets the right amount of fuel, which is vital for achieving the desired performance and avoiding fuel-related issues.