Engine Displacement
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Engine displacement is the total volume swept by all the pistons in one complete cycle, usually expressed in liters or cubic centimeters. It's a rough indicator of an engine's potential power and torque, since a larger volume can draw in and burn more air-fuel mixture per cycle, though forced induction and technology can significantly change the relationship.

The formula is: displacement = π/4 × bore² × stroke × number of cylinders, where bore is the cylinder diameter and stroke is the distance the piston travels. Each cylinder's swept volume is calculated individually and then multiplied by the number of cylinders.

Displacement only measures swept volume, not other critical factors like compression ratio, valve timing, turbocharging or supercharging, fuel type, and engine speed (RPM) limits — all of which affect how much power and torque an engine actually produces from that same displaced volume.

While larger displacement generally supports higher power potential, a smaller turbocharged engine can produce more power and torque than a larger naturally aspirated one, because forced induction effectively increases the amount of air-fuel mixture packed into the same cylinder volume.

Not directly — while larger-displacement engines often consume more fuel at a given load due to greater internal friction and pumping losses, actual fuel consumption depends heavily on how the engine is used (load, RPM, gearing) and modern technologies like cylinder deactivation, which can make a large engine surprisingly efficient at light loads.