Main engine and genset exhaust through one muffler
- Thread starter Mako
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If you have answers, please help by responding to the unanswered posts.
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No. Several reasons make it a bad idea.
If the valves are on overlap. You can have exhaust gases to push back through the main engine and out the air cleaner. Also if the engine has a turbo it will spin it with no oil and that will cause premature failure of the bearings.
If the valves are on overlap. You can have exhaust gases to push back through the main engine and out the air cleaner. Also if the engine has a turbo it will spin it with no oil and that will cause premature failure of the bearings.
tadhana
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This is not permitted by ABYC standards for the reasons Big Cat mentioned. I was an expert witness in wrongful death case where the boat builder combined the two exhausts and it killed someone. The builder lost.
Ski in NC
Technical Guru
Yep, bad idea.
There are some sporties that do this, but if you look closely, the gen exhaust ties into the main exhaust right at the tailpipe exit and has a clamshell glassed in to keep the two flows separate. I still don't like those, but less risky. I think this system is responsible for some of the otherwise "unexplainable" water in genny engine events.
Run the exhausts separate.
There are some sporties that do this, but if you look closely, the gen exhaust ties into the main exhaust right at the tailpipe exit and has a clamshell glassed in to keep the two flows separate. I still don't like those, but less risky. I think this system is responsible for some of the otherwise "unexplainable" water in genny engine events.
Run the exhausts separate.
Keysdisease
Guru
Good to keep the transom clean with only the main engine exhaust hole, bad for the megaphone effect from dumping 2.5" gen exhaust into a 14" main engine exhaust pipe just before the transom.
Shoalwaters
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True on the big and medium Bertrams of my acquaintance. Worth bearing in mind that the genset(s) usually have water-lift mufflers which may prevent backflow.
Keysdisease
Guru
Water lift mufflers may reduce the chance of backflow, but once you fill one of those little coffee cans up the water will start heading towards the exhaust manifold / turbo
A separator would make it next to impossible to back flood
A separator would make it next to impossible to back flood
