Quieting down the beast!

[ChrisfromVT]

How can you quiet down a big inline motor? I know they're pretty loud regardless, but how quiet can you get them? Does the rubber exhaust leg seal in the lower unit have anything to do with it?

 

[CaptainHook]

Re: Quieting down the beast!

I don't think there is much to be done. You shouldn't really be hearing exhaust while in the water though.

One reason it is loud is because of the type of shrouding mercury used. It is really thin and there is really no insulating properties to it.

 

[Huron Angler]

Re: Quieting down the beast!

You could buy a new jacket that goes inside the cowling to muffle noise a bit. I'm going to do this for my '71 4 cyl 80hp. They are like 20 bucks.

 

[ChrisfromVT]

Re: Quieting down the beast!

You could buy a new jacket that goes inside the cowling to muffle noise a bit. I'm going to do this for my '71 4 cyl 80hp. They are like 20 bucks.

Where can I find one of these?

 

[Huron Angler]

Re: Quieting down the beast!

You can check your local merc dealer...if they've been in business for a while they tend to accumulate parts like these.

What year and hp is the OB?


Here's a place to look, they have pretty good parts coverage for mercs.
http://www.usboatsupply.com/Mercury_Mercruiser_Parts_Catalog2.php

 

[ChrisfromVT]

Re: Quieting down the beast!

1987 115hp...I just found some threads on "alternate" materials to lay in under the hood for sound dampening if I can't find the original material