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nzjetboating.com Forums => Projects => Topic started by: tibblewa on September 15, 2020, 19:56:51 PM

Title: Jetboat Sound proofing / deadening
Post by: tibblewa on September 15, 2020, 19:56:51 PM
Any recommendations on the best product for sound deadening for an engine compartment for a mini jetboat? Is it worth it or just invest in earmuffs? 😊
Cheers
Wayne
Title: Re: Jetboat Sound proofing / deadening
Post by: Matthewf/Norbert/TuiDog on September 16, 2020, 12:29:00 PM
lightweight carpet glued on all hull sides and transom end to end. some sort of foam bulkhead or ply between seats and engine. quality loaded cell under hatch
Title: Re: Jetboat Sound proofing / deadening
Post by: Ross Goldsack - JBNZ President on September 16, 2020, 13:18:38 PM
I've used the foil backed acoustic foam in my last few boats. It definitely helps but I wouldn't say it makes a huge difference. On the plus side it's very light and easy to install.
Title: Re: Jetboat Sound proofing / deadening
Post by: Matthewf/Norbert/TuiDog on September 17, 2020, 11:16:19 AM
I've used the foil backed acoustic foam in my last few boats. It definitely helps but I wouldn't say it makes a huge difference. On the plus side it's very light and easy to install.
you need the loaded type... it will have a heavy membrane sandwiched through it... costs a lot but worth it...
Title: Re: Jetboat Sound proofing / deadening
Post by: Paul on September 17, 2020, 14:01:41 PM
you need the loaded type... it will have a heavy membrane sandwiched through it... costs a lot but worth it...

I did the whole engine bay with it.  It was expensive, but it was the proper marine engine bay stuff.

After a couple of years, the central 'heavy layer' starts to breakdown into a million 3-5mm sized pieces/balls that CONSTANTLY block your bilge pumps.

It took about 3 times longer to remove than to install, but definitley glad it's gone, even though it was quieter (for a few years).


I cannot, recommend using this stuff in our hulls that tend to crash/impact quite a lot.  Maybe in a mega-yacht hull than never impacts it may work for an extended period, but not in ours.
Title: Re: Jetboat Sound proofing / deadening
Post by: Matthewf/Norbert/TuiDog on September 17, 2020, 16:57:45 PM
i have used it for 20 years no issues!
you need to make sure the stuff you buy is fit for purpose and fuel compatible b>

I did the whole engine bay with it.  It was expensive, but it was the proper marine engine bay stuff.

After a couple of years, the central 'heavy layer' starts to breakdown into a million 3-5mm sized pieces/balls that CONSTANTLY block your bilge pumps.

It took about 3 times longer to remove than to install, but definitley glad it's gone, even though it was quieter (for a few years).


I cannot, recommend using this stuff in our hulls that tend to crash/impact quite a lot.  Maybe in a mega-yacht hull than never impacts it may work for an extended period, but not in ours.
Title: Re: Jetboat Sound proofing / deadening
Post by: Paul on September 17, 2020, 17:48:07 PM
Proper marine stuff.  I even bought all of the proper glues and sealing tapes.  Somewhere north of $700, about 12 years ago.

Never again.