BSFC calculations help determine how much fuel is required to get the desired horsepower per hour.

• A. False
• B. True
• C. It measures fuel pressure
• D. It adjusts ignition timing

Answer: (B)

BSFC shows how much fuel is needed to produce a unit of power over time. It’s usually expressed as pounds of fuel per horsepower-hour (lb/hp-hr) or grams per kWh, meaning fuel flow is tied directly to the amount of power the engine is delivering. To find how much fuel is required for a desired horsepower, multiply the BSFC value by the horsepower you want and by the time you’ll run at that power. For example, at a given operating point, fuel flow = BSFC × horsepower; over one hour, fuel amount = BSFC × horsepower × 1 hour. So BSFC calculations directly help estimate fuel needed for a specific horsepower sustained over time. Remember BSFC varies with engine speed and load, so use the value that matches the actual operating conditions. The other options aren’t what BSFC does: fuel pressure is a separate measure, and ignition timing is adjusted based on many factors but isn’t what BSFC computes.