Sailing NVvideo
Tips & Secrets for an Exhilarating Exhaust install | S2 Ep 72
September 28, 2025 · 20 min · 6K views · North Borneo
What this video covers
The crew of the Open 66 *NV* replaces their engine exhaust system to accommodate a higher-horsepower engine, requiring a transition from 76mm to 90mm piping to reduce back pressure.1:39 During the installation, the crew discovers the original exhaust path runs through a structural longitudinal bulkhead that cannot be enlarged, forcing them to reroute the system through the boat's technical room.2:36 They install a 20-liter waterlock in the new location and construct a high-loop siphon break to prevent seawater from back-flowing into the engine.11:18 To connect the 76mm engine outlet to the 90mm waterlock, they weld two 316 stainless steel elbows at a 90-degree angle.9:10 Because a suitable exhaust through-hull was unavailable in Kudat, they fabricate a custom, structural carbon fiber through-hull with an integrated flap valve.14:04 The final installation secures the piping with multiple supports and jubilee clips to ensure the system remains rigid and watertight.13:26 Proper exhaust geometry and siphon height are critical to preventing saltwater ingestion during heavy seas.17:20
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