Question about sound insulating the fuel tank access cover

[Bruce]

For those that have done it? Did you insulate the entire cover or just inside the fuel tank cutout area? I am thinking about removing the rubber strip around the outside and insulating the entire cover. This may make it stick up a little but I believe it will help a lot with noise.



Here is my fuel tank label picture.

 

[Andy S]

@Bruce I haven't insulated my gas tank lid yet so no help there. But I do have a question, are you planning to or have others done it, fill the cable chase between the gas tank compartment and the helm (where the steering & throttle cables pass)?

 

[KXCam22]

I put dynamat on the inside of my cover, the silver foil covered auto stuff. Had some extra laying around. I did the entire cover and did not remove the strip but It does not sitckup more than stock. It does actually seem to make a difference. Cam.

 

[billyb]

I bought some pipe insulation to line the engine hatch which I will be installing this weekend. I am going to try to remember to take iPhone readings, but knowing me, will probably forget.

I also ordered a batch of this stuff today that I plan to put on the fuel tank access cover next weekend.

http://www.knukonceptz.com/sp/kno-knoise-kolossus-edition-2-door-kit-14sq-ft/

It should be enough to do the fuel tank.

 

[Trevor Shipman]

I bought some pipe insulation to line the engine hatch which I will be installing this weekend. I am going to try to remember to take iPhone readings, but knowing me, will probably forget.

I also ordered a batch of this stuff today that I plan to put on the fuel tank access cover next weekend.

http://www.knukonceptz.com/sp/kno-knoise-kolossus-edition-2-door-kit-14sq-ft/

It should be enough to do the fuel tank.

Please let me know what you think! I'd be interested in the findings! Oh and pics too!

 

[billyb]

I do think by replacing that outside rubber strip with a more form fitting bulb type strip, that would definitely help I think. I have not found that yet, but plan to do that as well.

 

[waterboy]

I insulated the tank cover with the Dynamat and Dynaliner type material. I also replaced the bulb strip around the engine cover. I don't have any data (and yes I'm an engineer by training) but it made a HUGE difference in sound reduction while at speed. Probably not as quiet as the 2015's but good enough to have a discussion in the cockpit while at speed.

@Bruce I went to the edge of the current seal but did not replace it. I like that idea as I still get some water leaks into the gas tank area, but not too much.

 

[billyb]

Well, I guess for the time and energy and $16 this was worth the 1 decibel reduction I received. Granted this reading was from a free iPhone app and the boat was slightly on my lift IN NUETRAL...but whatever, it's done. I hope to get better results with the good sound damper I bought for the gas tank hatch.

 

[Chillypilot]

I put Stinger Roadkill similar to dynamat on my hatch. It definatly helped, especially with the resonance.

 

[Trevor Shipman]

I put Stinger Roadkill similar to dynamat on my hatch. It definatly helped, especially with the resonance.
View attachment 23886 View attachment 23887

Did you do anything to the engine box?

 

[Chillypilot]

I put soundown on the engine hatch and sidewalls. I also put pipe insulation as a seal for the engine compartment. The boat is quieter. Mostly the high pitch sound is less and the resination is much less. It's not as quiet as I would like but it is quieter.

Here is a link to last years sound dampening discussion.
https://jetboaters.net/threads/what-is-the-best-sound-deadening-product.2088/

 

[justason]

I did my entire cover with a double layer. @waterboy helped considerably. I then filled the gaps around the tank with some closed cell ESD foam i had to minimize the resonace there

Its documented here somewhere. Cost about $100

I havent really noticed the difference i was after . I tried the pipe insulation around the lip as well and that just made the lid a little harder to close