What will happen to the performance of the diesel engine when the stacker is operating on the mountain?

When a diesel engine operates at high altitudes, such as on a mountain, the performance is affected due to changes in atmospheric pressure. As altitude increases, atmospheric pressure decreases, which in turn affects the density of the air available to the engine. Diesel engines rely on a specific amount of air to mix with fuel for combustion, and when there is less air (due to lower pressure), the engine can’t intake the optimal amount needed for efficient combustion.

In this scenario, the decrease in air density leads to a reduction in the engine's ability to produce optimal power, resulting in decreased horsepower. This phenomenon is crucial for operators to understand, especially when planning tasks that require heavy lifting or long durations of operation in elevated environments, as the effectiveness of the diesel engine is compromised. Thus, the assertion that horsepower decreases as atmospheric pressure decreases accurately describes the impact of high altitude on engine performance.