| Aberman |
| (regular) |
| 09/05/2008 23:57 |
Engine room/hole cooling?
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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?
| bigdaddy |
| (regular) |
| 10/05/2008 01:22 |
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Re: Engine room/hole cooling?
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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
| roly_voya |
| (regular) |
| 10/05/2008 01:36 |
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Re: Engine room/hole cooling?
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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
| Squeaky |
| (regular) |
| 10/05/2008 08:01 |
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Re: Engine room/hole cooling?
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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
| Captainslarty |
| (regular) |
| 10/05/2008 11:06 |
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Re: Engine room/hole cooling?
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How often do you use the engine ?.. most are noisy down below, but not objectionable.
| whipper_snapper |
| (regular) |
| 10/05/2008 11:37 |
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Re: Engine room/hole cooling?
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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.
| Anchorite |
| (regular) |
| 12/05/2008 18:57 |
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Re: Caveat emptor
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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.