Next message: Dave Benjamin: "RE: lv-ab: Norwegian Steam"
Be careful about insulating the engine compartment: Sound insulation also
tends to act as thermal insulation, so you could turn your engine
compartment into an oven. Also, the insulating material should be
fireproof, which may be costly in these post-asbestos days.
Perhaps you should try some other tactics first:
1) Make sure your engine mounts are up to snuff; otherwise, the engine
could be shaking about unnecessarily, or just resting directly on the
engine stringers, and transmitting vibration directly to the hull.
2) Make sure your shaft and prop are properly aligned and balanced; even
the quietest engine will sound like a cement mixer full of scrap metal if
the rest of the drive train is compromised.
3) Make sure your engine is properly tuned: timing, valves, carburetor. If
any of these is out, it can cause the engine to shake, rattle and roll.
4) Often, noise results from harmonic vibrations: Check to see if noise is
coming from places other than the engine, e.g., hatches vibrating, stowed
gear rattling around, tanks oilcanning.
Mike Fordyce
S/Y K. 361 (C&C 40)
M/Y Fortissimo (Chris Craft Roamer 56)
Vallejo, Calif.
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