Originally Posted by Pelagic
Before deciding, consider a Gas/water Separator for your Gen.
They make the Gen. whisper quiet and generally favor a short run off the Stbd side.
Mine is set up that way and the dry gas exhaust which exits about 3 feet above the waterline and aft of seating, is swept away nicely by even the lightest breeze hitting the hull.
Sometimes with stern positioned exhaust, you can get a bit of a vortex in light conditions, that sweeps the exhaust back in.
Take it out the side and separate the exhaust water. A shorter run will be better for the genset. Less likely to ingest water and with a seperator it will make less noise
Keeping a proper drop on a long exhaust can be difficult.
"Most generator and engine
manufacturers call for a specific minimum “drop” in the exhaust, often 12″ (305mm), from the exhaust elbow
or spray ring to the muffler
, with a continuous downhill slope of ½″ per foot (42mm/m). Probably the most common violations I encounter are wet-exhaust hoses that form a lazy-U shape, dropping from the injected elbow
to the bottom of the generator sound enclosure, exiting the enclosure, and then traveling upward to a waterlift muffler
. Depending upon the generator’s orientation, water trapped in this section of hose can—when the vessel rolls, heels, or pitches—sluice up and into the exhaust manifold, and then to the open exhaust valves, and finally into the cylinders."