What does the term "economy mode" mean in marine diesel engines?

The term "economy mode" in marine diesel engines refers to a setting that optimizes fuel consumption by adjusting engine performance parameters. This mode is designed to allow the engine to operate at a more efficient fuel consumption rate, which can include modifications to the engine’s governor settings, fuel injection timing, and other performance parameters that enhance overall efficiency without compromising engine function. The goal of economy mode is to reduce fuel usage during routine cruising, benefiting both operational costs and environmental impact.

Setting the engine to economy mode typically involves a trade-off where maximum power output may be sacrificed in favor of greater fuel efficiency. This is particularly useful for longer journeys where maintaining speed is less critical, allowing the engine to operate within a range that consumes less fuel while still delivering sufficient power for the required performance.