The new exhausts are schedule 10 pipe and schedule 10 pipe elbows in 316 cres. 316 cres is one of the most corrosion resistant stainless steels. It is far superior to 304. The mixer components are also machined from 316 cres. The inlet and discharge are area matched to ensure the entire mixer fills with seawater. Ready built mixers are available from various manufacturers, but we made our own. Everything is TIG welded together with 316 filler rod.
Some crude jigs were made from angle iron and mig-welded together so that mockups could be made from cardboard before cutting the final components. The metal sections were tacked together using stainless wire in a mig welder. The units were then TIG welded together by a friend of mine.
The exhaust design uses a dry riser section that places the mixer downstream, in a gravity drain position. This enables all the salt water to drain out of the mixers when the engines are shut down, while preventing any water from sloshing back into the engines. I believe that ABYC code requires 6 inches of clearance between the dry section and any structure (f/g) in the boat. There are 2 rigid mounts on each exhaust which are isolated with rubber dampers.
The exhaust blankets were made locally by Orange County Thermal Industries. They needed the exhausts for about a week to complete the blankets. Turnaround was about 2 weeks.
- One of the trial fits in cardboard
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- Machined mixer components
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- One completed mixer
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- One completed mixer
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- Starboard side tacked up
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- Starboard side fit check, tacked assembly
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- Starboard side fit check, tacked assembly
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- Starboard side before installation
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- Starboard side during installation
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- Starboard side during installation
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- Starboard side complete
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- Starboard side bracing
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- Port side in jig
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- Port side tacked up
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- Completed port side
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- Completed Project
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