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Old 03-06-2014, 09:32 AM   #11
RickB
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
It is pretty rare - can't even think of one - to see a generator exhaust well above the waterline. Why would anyone want to do such a thing anyway? Nearly all the boats I deal with can select generator exhaust discharge on the transom at the waterline or over the side at the waterline near the generator location.

With regard to sharing exhaust pipes, it is simply bad practice to do so on a wet exhaust system. If the generator/or main engine is running and a wave blocks the outlet momentarily, damp gases can flow back through open valves of the non running engine and may lead to corrosion at least.

Even sharing a dry exhaust is poor practice for many of the same reasons. About a pound of water is created for every pound burned and that water goes out the exhaust. You really don't want any of that moisture going into the non running engine where it instantly condenses.
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