What term describes the total volume inside an engine's cylinders?

The term that describes the total volume inside an engine's cylinders is displacement. Displacement refers to the volume swept by the pistons as they move up and down within the cylinders, and it is a key factor in determining the engine's size and power output. It is typically measured in liters or cubic centimeters (cc) and plays a crucial role in understanding an engine's capability to produce power and efficiency.

In contrast, torque is a measure of rotational force produced by the engine, which relates to how the engine can perform work rather than the volume of the cylinders. Compression refers to the decrease in volume of the air-fuel mixture within the cylinders during the compression stroke, which is a part of the engine cycle but not a measurement of the cylinder volume itself. Power is a broader term that refers to the rate at which work is done or energy is produced, often related to the engine's performance but not specifically about the cylinder volume. Therefore, displacement is the correct term to describe the total volume inside an engine's cylinders.