I'm building a new "engine cover" (technical name for a plywood
box really). It will cover my raw water
cooled inboard 2qm15 Yanmar engine
and thought I'd better get some expert advice before I get too carried away.
My boat doesn't have dedicated air vents or blowers to circulate air through the bilge
and around the engine
and the old cover had a couple of small louvre vents but the amount of air they'd let through makes me wonder if I would need them in the new cover at all?
I am going to use some kind of soundproofing inside the cover to quiet things down and I'm thinking if I have to cut holes for air vents then that will reduce the effectiveness of the soundproofing.
Of course it's better to have a noisy, cool engine than one that is quietly boiling it's guts out, but I'd prefer to have no vents in the cover if it is safe to do so.
What are your opinions please? Perhaps you know better method?