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  #1   IP: 99.249.253.58
Old 11-05-2011, 09:00 AM
Jimmy Jimmy is offline
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Cockpit Noise Reduction

I am working on reducing the noise in the cockpit area while under motor. To accomplish this I need to do two things.....
1) Replace my "worn in " blower .....it is a little too loud for my liking , and I choose to run not only before starting , but at all times the A-4 is running , and on hotter days , for a few minuets afterwords
2) Add sound insulation. Currently have none , with the engine directly below the cockpit area. Access is thru the companion way stairs and starboard lazzeret. (I have a pretty good water muffler.)

What is the quietest blower motor out there?
What type of insulation would you suggest?

I actually like the sound of the engine , purring at my feet , however the wife has a different though.....so I need to reduce THIS noise , so others will automatically go away

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  #2   IP: 108.23.219.10
Old 11-05-2011, 11:16 AM
Dave Neptune Dave Neptune is offline
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Thumbs up Noise

Jimmy, I too hate undo noise on the boat and I am a stickler for running the blower~before~during & after running the engine. My blower is mounted just ahead of the exit horn on the transom. I mounted it to a bulkhead with vibration isolators used in some automotive electric fuel pump mounts. I got them from Mazda I believe they were on the RX-3 & 4's where the pump mounted under the rear qtr panel. McMaster Carr probably has something similar. They have been in service for many many years now and you can barely hear the blower. Once the engine is running I occasionally check to be sure that it is running. My blower is a 4" and a plastic frame. I have no idea what brand it is, I bought it at a marine supply probably over 20 years ago. It is mounted high on the bulkhead in a dry spot ajacent to the lazerett. I have had many comment on how quiet my boat is when motoring , a good thing.

Dave Neptune
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  #3   IP: 71.79.244.92
Old 11-05-2011, 04:08 PM
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msmith10 msmith10 is offline
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As Dave mentions, unless you put some type of rubber isolators between the blower and whatever you mount it to on the boat, it will be noisy. The same thing with the engine. I lined my engine compartment with 1/2" foam/lead layered silencing material. It helped a little. However, with my engine hard mounted to the stringers, without any rubber insulators, it was like putting lipstick on a pig.
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  #4   IP: 71.252.23.95
Old 11-05-2011, 09:23 PM
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sastanley sastanley is offline
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Hi Jim, I love this stuff...it is really a heat shield, but likely helps with noise as well. My engine is in the middle of the boat, so I don't quite have the noise issues when all the 'holes' in the cabinetry are closed. I tend to keep them open though, because I want to hear any changes in the old girl's temperment.

heat shield at Amazon.com

I'd also recommend checking out magazines like Good Old Boat...they have advertisers that have some engine box insulation solutions also.
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Last edited by sastanley; 11-05-2011 at 09:27 PM.
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  #5   IP: 75.197.147.13
Old 11-06-2011, 09:46 AM
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hanleyclifford hanleyclifford is offline
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Talking

check this out - http://www.defender.com/product.jsp?...02333&id=96126
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  #6   IP: 174.65.51.3
Old 11-06-2011, 10:14 AM
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jpian0923 jpian0923 is offline
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Some have reported success in quieting their engine by filling it with diesel oil. I have not tried it but others that have, might want to expand on the discussion.
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Last edited by jpian0923; 11-06-2011 at 10:20 AM.
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