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Engine sound insulation

2493 Views 11 Replies 8 Participants Last post by  UnionPacific
My boat has sound insulation (1 inch foam sheeting with foil facing) on the bulkheads immediately surrounding the engine (Yanmar 2QM15). Not sure if it's original or PO installed, but I suspect the latter.

But the boat really doesn't have a true "engine room", so the bulkheads where the insulation is installed aren't continuous, which means that the engine is not encapsulated by insulation, and to my layman's way of thinking the sound can travel pretty much anywhere. For example, there is only a thin, uninsulated panel between the engine and quarter berth.

I removed some of the insulation to fix some wiring, and doing so made a big improvement in engine access clearances, so I'm thinking about removing it all.

Any reason I shouldn't do this, other than causing (possible) noise level increases?
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That insulation also prevents some heat loss... in summer a good thing, maybe in off season not such a big deal.

Here's a trick we've used to quiet things down that works REALLY well, and is easily removeable when engine access is required. If you can find/get one, drape a dentist's 'Xray apron' directly over the engine. Be careful to ensure that the air snorkel isn't blocked (one of the armholes works well) and avoid any bare hot exhaust piping - and, of course, any moving belts etc. It's quite amazing how much noise that cuts out right at the source. And no, it does not affect engine temperature!
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