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We spotted some tiny weeping from one of the stock cummins elbows, and decided time to replace before big problems occur.
We are going with a new design, but one that will fit pretty close to the existing foot print. The approach we are taking is a dry 90 elbow with insulating wrap, with a 4 inch long shower head at the end of the 90. That takes the injection point well below the turbo outlets, and ensures that gravity is always working on our side.
The boat is a Tiara 4000E, and the exhaust after the water lift goes as high as possible in the engine room then exits the sides of the boat. There is water retained in the mufflers and associated hoses a little higher in the plumbing than I would like, but given my fresh water flushing regime, I don’t think there is an issue with salt vapor.
If budget were unlimited, space not a consideration, I would prefer to have an dry exhaust which went to the very top of the engine room, then had a shower head pretty low, but that is simply not practical in our engine room.
Do folks see egregious gaps in judgement on this installation approach?
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When I look at an exhaust on a Cummins engine I ask myself just one question.
When the engine is OFF…NOT running and the boat docked……Does ALL the raw water that has entered the “mixing elbow/ shower head/ call the piece what you want” DRAIN out ?
If the answer is NO, like shown in FireIsland’s 1st picture with the stock Cummins elbow, then the exhaust does not past muster and will be “junk” over time even with stainless steel risking the turbo failing and possibly a valve or cylinder. Might take a yr or two…might take 15 yrs.
A lousy design just causes more bull crap down the road for the owner or subsequent owner/s
Here’s a pic of the exhaust in my little lobster boat. Designed for a “lifetime” !
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