Stop the Noise: How to Quiet Down Your Boat’s Engine

Do you have an older boat that’s so loud that you have to yell at your guests so they can hear you? Maybe you bought a brand-new boat that sounds like a lawn mower. Sure, you can pay an acoustics expert hundreds, if not thousands, of dollars to add all sorts of insulation so you can enjoy riding in peace and quiet. However, there are ways to do this on the cheap too.If you’re a DIY kind of person, we’re here to save you some money with some really affordable ways to quiet down a boat’s engine. So, if you’ve been asking yourself “How do I make a boat quieter?” we’re here to tell you exactly how. There’s nothing relaxing about a loud boat, so let’s get to it!

Hiring an Expert

An acoustics expert is the person you’d have to hire if you decide to pay someone to do the job of quieting down your boat’s engine. These experts come in and measure your boat before selling you insulation materials. You then have the option of doing the installation yourself or paying them to do it. This won’t be cheap, even if you do the work yourself. Of course, this is the most fail-proof way to do it and there are no DIY tricks that will beat it.

The Engine Room

This is where most of the intrusive sounds come from in a boat. Simply seal all passages other than the vents. You certainly don’t want to block the necessary vents that supply your engine with air to prevent combustion. However, you should seal doors and openings in the bulkhead. You can use caulk or foam –yes, inexpensive stuff. If you’re using foam, just glue it inside the engine cover. Also you can use a laminate deadener inside the cowling, which is often the source of the noise.

Pump Noise

Your pump needs to move and shake but it doesn’t need to rattle against other objects and make so much noise. What you can do is mount the pump on pieces of flexible hose or synthetic rubber and screw it to where it needs to be mounted. Look around and see what else in the boat rattles and shakes and see if you can similarly insulate the object with rubber or hose material to avoid it from making as much noise.

The Engine Box

Use sound-reduction foam that is safe for gas engine compartments to line the inside of the engine box. If this doesn’t improve the sound quality, check your exhaust bellows. If they are disconnected, connect them again. If you’re still hearing way too much noise, have your exhaust system checked out by a professional. Do not extend the exhaust however. Always allow it to remain above water, where it should be.

Is it the RPM?

Make sure you have the right prop on your boat. The excess noise could be that the engine is working at a higher RPM than it should. In general, if it’s revving at more than 4,800 RPM, your boat may need a prop with a higher pitch. On the other hand, relatively new boats tend to make a lot of noise, so if you just bought yours and it’s loud, give it some time.


Hopefully, we’ve helped you quiet down your boat somewhat. Now, we’re going to make sure you’re protected in case you incur a loss with your boat. RV insurance doesn’t have to be expensive so make sure you have reliable coverage for your boat. Speak with an RV insurance Specialist about your needs and get several free quotes at once: (866) 501-7335.

The information in this article was obtained from various sources. This content is offered for educational purposes only and does not represent contractual agreements, nor is it intended to replace manuals or instructions provided by the manufacturer or the advice of a qualified professional. The definitions, terms, and coverage in a given policy may be different than those suggested here and such policy will be governed by the language contained therein. No warranty or appropriateness for a specific purpose is expressed or implied.

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