What does wet stacking refer to?

Wet stacking is a phenomenon that occurs primarily in diesel engines, particularly when they are operated at low loads for prolonged periods. When the engine is not running at its optimal temperature or load, unburned fuel can accumulate in the exhaust system. This unburned fuel usually results from incomplete combustion, which can occur when the engine is idling or operating under light load.

The accumulation in the exhaust not only impacts performance but can also lead to issues like increased emissions, potential soot buildup, and even damage to exhaust components over time. In contrast, engine cooling, oil contamination of fuel, or overheating exhaust systems do not directly relate to the unburned fuel issue described in this context. It is important for operators to understand wet stacking to maintain engine efficiency and longevity.