Indicated Specific Fuel Consumption in Engine Dynamics Formulas

No, the Indicated Specific Fuel Consumption, measured in Specific Fuel Consumption cannot be negative.

Indicated Specific Fuel Consumption is usually measured using the Kilogram per Hour per Watt[kg/h/W] for Specific Fuel Consumption. Kilogram per Second per Watt[kg/h/W], Kilogram per Second per Brake horsepower[kg/h/W], Kilogram per Hour per Kilowatt[kg/h/W] are the few other units in which Indicated Specific Fuel Consumption can be measured.