Reducing engine noise-gctid803816

[360_mafia]

Any suggestions on engine cover insulation.What is there now is 394 mill thick.Would like around 1"thick.The boat has an engine box not a hatch.

[CptCrunchie]

"360 mafia" post=803816 wrote:
Any suggestions on engine cover insulation.What is there now is 394 mill thick.Would like around 1"thick.The boat has an engine box not a hatch.

This is what I used. Works great! Easy to cut and apply too.

https://www.amazon.com/gp/product/B00H6X4V7C/ref=s9_dcacsd_dcoop_bw_c_x_1_w

I see the price came down. Lucky you!

[Mr._Darcy]

There is an outfit in MA called Soundown that has a good variety of marine sound absorbing materials. There is also a company in Tigard, Oregon that manufactures sound absorbing materials but I can't remember the name. If it comes to me I'll edit this post

Greg

It is called Composite Barriers / Sound Technology

[706jim]

As well as choosing a good sound deadening material (something with lead in it works well BTW), consider also any openings to the engine which may transmit noise. Our old boat had a Greymarine flathead six which was actually very quiet what with the valve train buried within the engine block.

We replaced the Grey marine with a 4 cylinder Ford diesel Osco conversion and it was LOUD to say the least. Adding tons of noise reducing foam help significantly, but plugging holes that allowed sound to filter out of the bilge helped reduce the sound considerably. Had we done the same with the Greymarine, it would have been nearly silent.

[richardson]

Add seals to the edges of the engine box and any other hatches to that area if it does not already have some. It is amazing how much that helps.