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→Wet or Dry Exhaust System
= Wet or Dry Exhaust System =
The exhaust system can be a dry stack routed up the mast, or a wet system exiting the stern or side under water or just above the waterline.<ref>http://www.nordhavn.com/resources/tech/exhaust.php</ref> <ref>http://www.westmarine.com/WestAdvisor/Exhaust-System-Basics</ref> <ref>http://www.akmicorp.com/marine-diesel-exhaust-wet-or-dry/</ref> In the wet system, seawater circulates in a jacket around the exhaust to cool it. Cast iron jackets tend to rust out after a few years.
Intuitively, you may not like large underwater openings protected by an inverted plumber’s trap. Also, the pumping losses on the engine will be greater with a wet exhaust. But anecdotally more boats have had stack fires than have been swamped by wet exhausts. Wet exhausts are cooler, and use flexible hosing.
