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Old 07-19-2008
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Noise reducing material for enginer area bad...?

I purchased some 3/4 inch noise reducing material and want to install it inside my engine compartment...is this safe...?

Meaning, when the engine is running would it not case the engine to run hotter...? I live in Miami..

The distance from the engine wall to the engine is about 2 inches right now...I am doing this because the engine is very noisy when inside the sailboat and it is running.

thanks

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Old 07-19-2008
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Here are two threads on the subject, I couldn't find the one I was looking for which was from about two weeks ago.

Sound Deadening

Best way to soundproof engine compartment?
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Old 07-20-2008
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Don't cut off the air flow to the motor.

It's a good idea to install an indoor / outdoor thermometer in you cabin with the outdoor sensor in the engine compartment. The engine compartment should stay below 130 F. If air in there is too hot it becomes thin and you'll get combustion problems.
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Quote:
Originally Posted by marinesniper View Post
I purchased some 3/4 inch noise reducing material and want to install it inside my engine compartment...is this safe...?

Meaning, when the engine is running would it not case the engine to run hotter...?
If you're going to install it only on one bulkhead, probably not significantly--if you don't reduce airflow into the engine space or around the engine. But if you're thinking about installing more than that, especially since...

Quote:
Originally Posted by marinesniper View Post
The distance from the engine wall to the engine is about 2 inches right now...
I assume you're talking between the engine and one bulkhead? So you'd reduce that to 1-1/4". I dunno... 1-1/4" isn't very much.

Quote:
Originally Posted by marinesniper View Post
I am doing this because the engine is very noisy when inside the sailboat and it is running.
Two solutions to that: 1. Stay outside, 2. Use the sails, instead of the engine

I'm going to guess that the engine being in such a confined space in our boat, and we've much more than 2", all around, is the reason Pearson used a kind of "Venetian blind" kind of wood thing between the quarter berth and the engine space on our boat, and pegboard between the engine space and the lazerette.

You can buy a relatively inexpensive indoor/outdoor digital thermometer set at Radio Shack. Secure the outdoor unit above the engine near the bulkhead in question. Reset the high/low temperature memory. Run things as they are through your normal routine. Note temp. maximums. Install sound-deadening materiel. Reset high/low temp. memory and do what you do again. Check difference.

Installing the sound-deadening material on one engine compartment bulkhead might not do much. I'm going to guess that much of the sound is transmitted throughout the boat via all of the engine-facing surfaces. Being inside the cabin when the engine is running is kind of like being inside the drum.

Jim
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thank you for the reply's, the reason for this is my wife likes to hang out below and take naps or watch a movie and I when I need to start the motor to charge the batteries and what not it is very loud. My wife is not a lover of sailing, but she does come along for me...
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Old 07-20-2008
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I have installed noise reducing panels in all of my boats, it reduces the noise significantly. You should only use the foam panels that are designed for marine engine compartments because of the fire danger. I buy mine from Hamilton Jet in Woodinville, WA. There are several different types and thicknesses for different applications. The best for deadening diesel noise has a thin lead layer in the foam IIRC.

Here is a link to the Hamilton Jet products available:

HamiltonJet Noise and Vibration Control Products

John
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