sailboat exhaust design
Exhaust design. home | exhaust design. below is a typical sailboat exhaust installation. the waterlock silencer (muffler) is the collection point for water in the exhaust system when you shut the engine down, and as such needs to be the lowest part of the exhaust system. you need a drop of about 9” from the exit of the exhaust elbow (x on the. Exhaust system design and installation compliance is critically important. never assume it’s correct simply because it works, or because the vessel is new. steve d’antonio is an abyc-certified master technician and owns steve d’antonio marine consulting. Lift mufflers like centek vernalifts are used both by powerboats and sailboats. they are vertical mufflers mounted below the waterline with an outlet line coming off the top of the container. exhaust gas and expended cooling water are mixed shortly after the exhaust manifold and travel together into the muffler's chamber where the cooling water collects before the exhaust gas pressure pushes. 
sailboat exhaust design Possible failures: water level gets higher because boat gets more loaded, leak inside water-jacketed exhaust manifold, heeling puts elbow too low, water surges in through exhaust outlet, raw-water pump impeller disintegrates. good if engine is installed on an incline, so water in manifold tends to drain away from cylinders. The exhaust design and/or system must fit the boat and work in such a way that water will never flood the engine, even if something fails, and the system needs to look “politically correct”.
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