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Join Date: Sep 2005
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The foam soundproofing will be quite effective.. esp compared to having had nothing there in the first place.. do check to see that you'll have clearance for an inch or more of soundproofing - some of these engine boxes are a tight fit.
It cannot, of course, do anything about the vibration. Have a close look at the engine mounts to be sure they are in good shape. If the vibration persists, esp underway and at speed, have the engine alignment checked carefully.
Heat buildup (in the engine box) may be greater, I suppose, with insulation, but it's not excessive since the engine is maintained at a reasonable temperature. If there's considerable length of un-cooled exhaust pipe you might want to specifically insulate that too.. but usually the mixing elbow is quite close to the block.
A nice feature is an engine box exhaust fan that runs while the engine runs to help dissapate/remove the heat and coincidentally some of the odors sometimes associated with a running engine. Running it for 5 minutes after shutdown will help even more.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)