What part of the engine is often referred to as its "heart"?

The crankshaft is often referred to as the "heart" of the engine because it plays a crucial role in converting the linear motion of the pistons into rotational motion, which drives the vehicle’s wheels. It is central to the engine's operation, as it is connected to the pistons and allows them to perform work by turning the engine's energy into mechanical power.

The design and condition of the crankshaft significantly affect engine performance, balancing, and smooth operation. Its integrity is vital for the overall health of the engine since it must withstand substantial forces and wear over time. Thus, calling it the "heart" symbolizes its vital function in maintaining the engine's rhythm and efficiency.