ak-guy
Senior Member
I have a dry exhaust and it exits the pilothouse roof at head level when standing on the back deck. There is ventilation around the pipe where it exits, see photo. I rebuilt the system using galvanized plumbing pipe, (1.25" and 1.5") which was a mistake. The first sea trials with the new system I got a lot of smoke, which was the galvanizing burning off, coming up through the ventilation portion. The smoke gradually went away but I still get a bad smell and it is bad enough to make standing at the rear steering station uncomfortable. The exhaust itself is released higher up and directed up and away. The smell is different than diesel engine exhaust, maybe acrid is a good term. Perhaps it takes a long time for all the zinc to go away and yes I know that the vapor is harmful. I am going to investigate for exhaust leaks and am considering replacing everything with plain steel or stainless. The second photo shows the interior with out the cowling. The reason for all the fittings is that the muffler has BSPT ports so had to convert to NPT.
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