Aberman
regular
Reged: 13/01/2005
Posts: 285
Loc: See blog for current location
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I need to sound insulate the engine hole or go completely mad.
My problem is, if I insulate against sound, the engine hole will get hot and remain hot, therefore reducing the eficiency and greatly increasing the fuel consumption. Now admitidly the engine is old, and not very efficient in any case, (Volvo MD21B CIRCA 1979-81) but every little helps.
How best can I install some fans to blow cooler air into the engine hole and, also to remove some of the hot from it? The engine hole is under the cockpit floor and conected to the accomadation at all, and relies on natural ventilation through all the little hole around the place to get air in/out.
Anybody done this? If so how did you go about it?
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At last I've escaped from the shore! Its a life at sea for me.
http://blog.mailasail.com/cape
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bigdaddy
regular
Reged: 18/02/2007
Posts: 40
Loc: Glasgow
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Without knowing your boat set up, how about 2 inline blowers, 1 for in and 1 for out, I found a ebay page selling the blowers that I have in mind,,,,, Clicky Here and Clicky Here
and you could fit Some of These to aid the in and out air,,,,,,
Dont know if this is what you had in mind, but its what I would do
cheers
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roly_voya
regular
Reged: 05/02/2004
Posts: 1049
Loc: Pembrokeshire Wales
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Might sound odd but look at where the noise comes from. Lots of older engins where more solidly mounted to cope with vibration but that leads to far higher transmition of structural noise, can you quell the beast this way rather than looking primarily at airbourn noise. If not take a good look at how the build the boxes for super silenced gensets
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Squeaky
regular
Reged: 25/03/2008
Posts: 20
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Good morning:
I strongly advise you ensure that LOTS of air gets into the compartment regardless of the noise. I spent years trying to keep a Volvo 2B healthy, even grinding the valves at sea between Cyprus and Israel, only to realize after replacing it that I had unwittedly insulated the engine compartment so securely that the motor was starved for air which prevented it from fully burning the fuel leading to a build up of coke on the valves. Diesels require 3 things - clean fuel, lots of air and oil in the sump.
Enjoy
Jack
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Captainslarty
regular
Reged: 12/08/2007
Posts: 2012
Loc: Currently La Coruna Spain
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How often do you use the engine ?.. most are noisy down below, but not objectionable.
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PM me for info re SSB's etc. Bought, sold, repaired, fitted and optimised.
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whipper_snapper
regular
Reged: 09/08/2006
Posts: 1309
Loc: Kenya
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I agree. Temperature is unlikely to become an issue. Air supply is an issue, but you don't need fans as the engine provides all the suck you need. You just need a hole big enough to let in sufficient outside air. Don't connect it direct to the intake, just put it (them) anywhere convenient so that you are turning over the engine-room air. If you go for a x-section area just 2-3 x bigger than the engine's air intake, then it must be more than enough.
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Anchorite
regular
Reged: 22/10/2002
Posts: 377
Loc: FRANCE nr. Lyons
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Most of these (relatively) cheap fans are not specified for continuous operation, usually for about 10 or 15 minutes intermittent. Continuous units cost nearer £100.
When a fan/blower is for continuous service, the blurb (and the price) will say so: if it doesn't, ask. If it's for extraction it may be pulling air at >50°C and will need to be properly engineered.
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