Best sound insulation for a one-cylinder Yanmar?

LakeMurraySailor

LakeMurraySailor

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Nov 10, 2015
195
Hunter 336 Columbia, SC
I've got a Yanmar SB12 in my Catalina 30 and running the engine is a headache if you want to go below. The sound will drive you crazy. I even have to put the companion boards in place while in the cockpit. What the best insulation to use? The engine cover was modified to accomodate the taller engine(I believe she came with an Atomic 4 gasoline engine)! It will have to be thin on top! Any and all suggestions would be appreciated.
 
ggrizzard

ggrizzard

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May 27, 2004
2,041
Hunter 30_74-83 Ponce Inlet FL
Don't have a product name, but go to a local car audio shop and ask them. They have choices and quality. Also ask about fire resistance rating.
 
SailormanDan

SailormanDan

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Jan 24, 2009
450
1981 Cherubini Hunter 27 Shipwright Harbor Marina, MD
I can't find a receipt, but I got some 1ft sq. self-stick stuff that is for marine use years ago that I stuck on the underside of my pull out stairs and it really helped make my Yanmar 1GM much quieter. I think it was about an inch thick. It is heavy, but that is part of the effectiveness of it. Not perfect, but makes the whole thing more tolerable. The other thing that helped was having the cutless bearing replaced, the prop and shaft balanced, new motor mounts, and then everything aligned.
I have a can of rubber spray-on stuff that I haven't used yet for a spot where the self-stick wouldn't hold.
 
Mark Maulden

Mark Maulden

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Jan 25, 2011
2,436
S2 11.0A Anacortes, WA
Sailorsolutions.com...worked great. Kinda expensive. Our grandson works at a car stereo shop and i remarked that i dont hear all the stupid bass thumping from cars lately..he said they must be doing their job. I would also check out car stereo places..Flammability might be an issue...
 
woodster

woodster

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Sep 15, 2009
6,243
S2 9.2a Fairhope Al
how far are you from augusta ga....go to morris supply co on broad street....about the twelve hundred block..... iirc..... and get some armaflex foam and adhesive .......that's what i have and i don't know mine is running about half the time if i am not at the stern of the boat
 
kito

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
Anyone try that fire resistant foam spray? I seen it at Lowes.
 
O

odaydokay

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Jul 5, 2011
735
Oday 28 Madison, CT
I did this many years ago. Worked well. I went to a foam fabricator. They buy big rolls and cut it for customer jobs. They were kind enough to sell me what I needed. Key question they asked was what was the exposure? I said mainly gas/diesel fumes at worst (hopefully neither). The asked because one foam type is alcohol resistant (and fails when exposed to petroleum fumes or liquid) and the other is petroleum resistant and they gave me the latter.I guess it is 1-1/2 to 2" thick and has a peaks and valleys texture. I did every area I could get to around the engine.
 
Justin_NSA

Justin_NSA

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Jul 7, 2004
8,481
Hunter 30T Cheney, KS
kito said:
Anyone try that fire resistant foam spray? I seen it at Lowes.
Click to expand
Interesting idea. If you could build a sort of shadowbox frame, you could spray it in. The frame would contain the foam and then you could shave it flush. Like they do between wall studs.
 
kito

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
I was thinking of just spraying it on the inside of all the engine box panels. I wonder how well it would stick? You would have to experiment with it a while to know how much to spray and see how much it expands. I have a can but haven't used it yet. I bought it for other purposes but thought it may work as sound insulation too.
 
Scott T-Bird

Scott T-Bird

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Oct 26, 2008
6,241
Catalina 320 Barnegat, NJ
It's a sailboat ... trim your sails and turn your engine off. Problem solved. Silence is golden. Aside from that, it would make me nervous if I couldn't hear any unusual sounds the engine may make underway. I took the remaining insulation out, once I saw that it was crumbling. That said, it is a bit noisy.:frown:
 
LakeMurraySailor

LakeMurraySailor

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Nov 10, 2015
195
Hunter 336 Columbia, SC
Hi Scott! Great point! I have a short trek to get out of the marina and out into the big water and then free at last(if I could just get that ringing out of my ears)! And besides that sometimes there's no wind and you just have to fire it up! It would also be nice to hear yourself think and of course let the crew hear the Captain's orders!
 
kito

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
How about those windless days and you are just out cruising?. The Admiral is in the cabin cooking vittles and you can't hear her complaining how loud it is? ....never mind ;)
 
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