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I've read a fair bit about noise reduction in the past and many of the requirements - making baffles in any air opening, covering every surface without exception, blah, blah - are simply impossible on a 27. My new diesel initally seemed so noisy, though, that I felt compelled to at least try a simple installation of a sheet of sound insulation.
The material is a half-inch layer of foam, about an eighth of an inch of a very heavy flexible material (a mix of lead and plastic?), another thinner layer of foam, bringing the total up to about an inch, then a layer of shiny plastic/foil. The sheet measures about 36" x 48" and cost C$86 at Genco in Toronto. I also bought a roll of 3-inch aluminum tape at Cdn Tire for C$5.00 and a can of 3M "77" spray adhesive from a weird discount hardware store behind Genco for C$15.
I measured all the surfaces in and around the engine space, as I wanted to cut the sheet in the most efficient manner. This turned out to be a good idea as one sheet doesn't go very far.
The club's head mechanic told me that most noise emanates from the head, not the crankcase or transmission, so I should concentrate on sound-reflecting surfaces in the forward end of the space. With the material I had, I was able to do the removable front (excluding the door), the storage area to port of the engine (perhaps the insulation will reduce ice consumption?) and the engine box lid. I have a piece left over suitable for the underside of the cockpit, but I couldn't bear to put it on in last week's heat.
Cutting the material is a bitch; a large pair of scissors does a neat job, but it's really slow, blister-raising going. Once the material was cut and dry-fitted, I taped the exposed edges with the aluminum tape. I don't know if this is essential, but it was done in a professional installation I looked at, so I thought I might as well do it. After that, I wiped down the adhesion areas with Varsol twice. The spray nozzle is very precise, but in some areas, I masked off areas where I didn't want glue. Then it was simply a matter of spraying adhesive on the back of the foam and on the sticking surface, aligning both carefully (you get *1* chance with 77 adhesive) and pressing down.
Thus far, the reduction in sound is not dramatic, but it is signficant and quite worthwhile, as the insulation seems to reduce the most irritating component of the sound. In other words, the engine is still fairly noisy compared to an A4, but it doesn't bug any of us. In the fall, I'll probably buy another sheet and in addition to insulating the underside of the cockpit, do the area under the sink, the side of the fuel tank and the removable bits of ply that close off the engine space.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
David---I've installed "hush-cloth" in several Yanmar 3GM powered tour boats---since most passengers don't appreciate the noise level from these little guys. There are a couple of versions of this stuff available---the thickest obviously works best. I used 5200 as adhesive---worked nicely---and it is there forever. (I have since lost my favor for 5200). One thing about the 1,2, and 3 Yanmars----just don't watch them---'cause you'll be checking the torque on the mounts needlessly---they do jump around. I trust that you are pleased with your 2cyl installation? I'm still thinking about it. Best, DaveDave Tinder
DAWN BREAKER Mk3
Ft Myers
Thus far I'm very happy with our little Yanmar. I'll probably be lot happier when the prop is balanced. As to the little beast moving around - it's like a caged beast in its first frenzied hope of escaping captivity.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Offline
David,
I have been thinking about insulation for Scalliwag. The old A4 heats up the engine compartment and cockpit deck during the hot summer days when we are motoring through the bugs of Lake Ontario. As well, I would like to listen to the CD player - when operational - even with the engine on.
Good Old Boat had an article on insulation this past winter. It is reproduced with permission on the C&C Photoalbum site. The link is <A href="http://www.cncphotoalbum.com/doityourself/soundproofing/index.htm">http://www.cncphotoalbum.com/doityourself/soundproofing/index.htm</A>
The product is from Sailor's Solutions Inc. (<A href="http://www.sailorssolutions.com">http://www.sailorssolutions.com</A>) I trust this is of interest.
Bruce Peever
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