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27-05-2018, 16:28
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#1
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Registered User
Join Date: Oct 2014
Location: Crisfield, Maryland
Boat: nauticat 44
Posts: 97
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Additional soundproofing versus overheating engine and fire hazard
The above title describes my situation.Just replaced my 6 cyl ford lehman non turbo with a 4 cyl B series cummins turbo 3.9 . I have no intention of running the cummins at a constant super high rpm BUT am concerned about overheating and/or fire issues if more soundproofing is done. Think the noise level of the 2 engines will be about the same. All the hatches are 1" thick wood with another 1" of expensive peg board soundproofing as well. I know it is critical for the engine and generator to breath...air. Less noisy is nice but I don't want a fire or overheated engine.I saw one product from defender marine that is called silent running sr1000 coating but maybe it is just blue sky? Seems so very simple to apply ! All of this machinery is on our 44' Nauticat motorsailor by the way. Maybe it is best just to keep it simple and leave well enough alone ? I am hoping for some wiser sailors to advise me.
Thank you. Michael 410-913-2330
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27-05-2018, 16:39
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#2
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Registered User
Join Date: Feb 2013
Location: Bumping around the Caribbean
Boat: Valiant 40
Posts: 4,625
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Re: Additional soundproofing versus overheating engine and fire hazard
Personally my experience with soundproofing is that it is a waste of money...but it all depends on your ears and those of your crew/guests and your boat.
I ripped out all the disintegrating soundproofing in my engine compartment...which was still doing it's job...and noticed very little difference. I replaced the soundproofing on all surfaces facing the cabin but over all noticed very little, if any difference, in the overall sound volume. Could just be my boat.
if you want to insulate out the wazoo then perhaps just add a blower to evacuate the engine compartment. I'm sure that would do more to pull fresh air in and keep the temps down than anything else.
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27-05-2018, 18:02
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#3
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Registered User
Join Date: Feb 2013
Location: Oregon
Boat: Seafarer36c
Posts: 5,563
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Re: Additional soundproofing versus overheating engine and fire hazard
There is little question that lead sheet and a decoupler works, all the other stuff might not.
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27-05-2018, 18:08
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#4
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Registered User
Join Date: Oct 2014
Location: Crisfield, Maryland
Boat: nauticat 44
Posts: 97
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Re: Additional soundproofing versus overheating engine and fire hazard
Thanks for the kind reply, Captain.
Tend to agree with you and just keep it simple (KISS).
I am from the Old School and today almost everything is getting too complicated except, for me, just treat people the way you want to be treated, which seems to have very much gone out of style.
Will wait and see how loud it is compared to the ford lehman.
My ears are not that sensitive.
The wife and I don't have endless money to spend making everything into a major money project.
THANKS again shipmate.
Kind regards,
Michael
P.S. we are in Baltimore and the boat is in Crisfield
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28-05-2018, 05:47
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#5
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Registered User
Join Date: Nov 2015
Posts: 372
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Re: Additional soundproofing versus overheating engine and fire hazard
Sound deadening sheets for car doors/trunks will help and won't add any real thermal insulation to the walls. Blower sounds like a good idea, maybe with its own thermostat for automatic runs.
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28-05-2018, 05:56
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#6
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Registered User
Join Date: Nov 2017
Location: Connecticut
Boat: in the works
Posts: 389
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Re: Additional soundproofing versus overheating engine and fire hazard
There are some excellent soundproofing material for the auto aftermarket industry. Look into those, but obviously stay away from anything open cell. a quick google search fetched this...
https://www.soundproofcow.com/produc...YaAooFEALw_wcB
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28-05-2018, 06:18
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#7
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Senior Cruiser
Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 3,494
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Re: Additional soundproofing versus overheating engine and fire hazard
Lead sheeting makes the biggest difference. Spray on foam on the outside of the engine room.
I use to build steel commercial fishing boats about 55'-90'. The living areas had 4"+ of foam, covered with plywood and a layer of fiberglass to seal in the foam. With engines running the actual sound of the engines couldn't be heard in the galley. Just a slight vibration.
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28-05-2018, 07:11
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#8
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Registered User
Join Date: Dec 2013
Location: Orange Lake, FL
Boat: '79 Albin Vega, '88 Catalina 22
Posts: 326
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Re: Additional soundproofing versus overheating engine and fire hazard
I'm in the process of installing this "Soundown" insulation from Jamestown. https://www.jamestowndistributors.co...%2FFoam+Sheets Hopefully it won't be a total waste of time, money, and weight.
And it IS heavy, which is somewhat reassuring.
I have a sneaking suspicion it is the same as this material I saw at McMaster.com: https://www.mcmaster.com/#54495T59. It certainly looks identical, and comes in the same width dimension. But the material at McMaster costs slightly more than twice as much.
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28-05-2018, 08:51
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#9
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Registered User
Join Date: Apr 2015
Location: Lakeland, Florida
Boat: Irwin Citation 34
Posts: 256
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Re: Additional soundproofing versus overheating engine and fire hazard
I just coated ny engine room wit the product "silent running", really don't notice any difference in engine noise. A waste of money and effort.
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28-05-2018, 11:55
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#10
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Registered User
Join Date: Dec 2013
Location: Orange Lake, FL
Boat: '79 Albin Vega, '88 Catalina 22
Posts: 326
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Re: Additional soundproofing versus overheating engine and fire hazard
Thanks for the review, CaptDave. I always had my doubts about those painted-on sound deadeners.
Sadly, I will never know how well my Soundown insulation works, if at all. I've never heard this engine run, so I have nothing to compare it to.
But I plan to tell myself it's amazing.
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28-05-2018, 13:28
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#11
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Registered User
Join Date: Feb 2014
Location: New Orleans
Boat: Kaufman 47
Posts: 1,184
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Re: Additional soundproofing versus overheating engine and fire hazard
We used the sound down paint on stuff then covered it with the 1ft/sq panels from Sailor Solutions. I guess it helped, I'm sure it did more than nothing. But I have no idea how much it did because I bought the boat unrunning and completely refitted the E/R.
https://www.instagram.com/p/8WknhKg0...=1xezyhcjfgwqb
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28-05-2018, 14:05
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#12
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Registered User
Join Date: Nov 2017
Location: Portland, Oregon USA
Boat: Island Packet, Packet Cat 35
Posts: 943
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Re: Additional soundproofing versus overheating engine and fire hazard
I had old heavy foam soundproofing that had mylar on 1 face which left everything else open to moisture and whooda thunk? Rot. Ripped out about 170 pounds of this crap and truthfully didn't really notice any huge difference.
I used to be pretty anti-engine and sailed whenever possible until I started driving tugs. Ok, now 40' up in the tuna tower the noise wasn't so bad but on other tugs inside the house it was loud. You get to used to it, 40 hours per week.
So my Cat has 2 engines and a 4kw genset. Running both engines I've yet to hear a noise complaint and being able to hear them more easily I can hear issues way faster than waiting for them to rear their ugly heads. For me, being able to hear the engines running normally is comforting now. Just depends on your viewpoint. I would never put that junk back in. The benefit is little especially when compared to the time, expense of installation.
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28-05-2018, 14:17
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#13
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Registered User
Join Date: Apr 2017
Location: Aboard
Boat: Hatteras CPMY 63’
Posts: 900
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Re: Additional soundproofing versus overheating engine and fire hazard
Sound is like water, it travels through any and all cracks or openings. To be effective you need to seal all exits from the engine room as well as track down any sympathetic vibrations that might be excited to add their own harmony. Wire runs through the engine room bulkheads will need to be sealed with putty, the same with pipes and hoses, and don't forget about any bilge areas that are common to the engine room and any living spaces..... Once you get it all nice and tight, you now have to think about ventilation.......
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28-05-2018, 16:47
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#14
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Registered User
Join Date: Sep 2014
Location: Mexico
Boat: Passport 40
Posts: 344
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Re: Additional soundproofing versus overheating engine and fire hazard
Sound deadening materials (spray, foams, sheets) usually (specially when they look like Dynamat or Dynamat Extreme, look them up), ADD MASS. This means that they are designed to change the resonant frequency of sheet metal in cars, more than they are about keeping sound out or in. Sound deadening sheets in car just work "against" the sheet metal more than anything.
My guess is that's why there will be little to no difference in using them. Most of the "sound" panels that we see (foam plus metallic looking film) are more about keeping reflected heat in the engine compartment than sound insulation me thinks.
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