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Wet stacking is a condition in diesel engines in which not all the fuel is burned and passes on into the exhaust side of the turbocharger and on into the exhaust system. The word "stacking" comes from the term "stack" for exhaust pipe or chimney stack. The oily exhaust pipe is therefore a "wet stack". This condition can have several causes. One of the most common causes are idling the engine for long intervals at too low of rpms which does not allow enough heat in the cylinder for a complete burn. Another is excessive fueling. That may be caused by weak or leaky injectors, fuel settings turned up too high or overfueling for the given rpms. Cold weather running or other causes that prevent the engine from reaching proper operating temperature can cause a buildup of fuel due to incomplete burn that can result in 'wetstacking'. In diesel generators, it is usually because the diesel engine is running at only a small percentage of its capacity. It is detectable when there is a black ooze around exhaust pipe connections and around the turbocharger.It may also show up as wet looking or dark coloured liquid on the right side of the engine block around the exhaust manifold. It can be mistaken for oil in some cases. Often you can hear a slight miss in the engine as it's running due to fuel buildup. Fuel efficiency may go down due to wasted fuel and reduced air capacity in the cylinder. When the engine is first placed under a load after long periods of idling and wetstacking it may blow some black exhaust out as it burns that excess fuel off. Continuous black exhaust from the stack when under a constant load is also an indication that all the fuel is not being burned. ==See also== *Crankcase dilution 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「wet stacking」の詳細全文を読む スポンサード リンク
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