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Old 20-01-2017, 15:48   #61
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Re: Should the engine bay blower be always on?

They told me to, too, but I forgot to...
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Old 20-01-2017, 16:05   #62
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Re: Should the engine bay blower be always on?

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Originally Posted by Crew of Turning View Post
I have thought of installing a couple of computer fans in the engine compartment of our boat. The idea was to push the warm out into the cabin in the spring and fall to lift the temperature. Have not done but has anybody tried and got results?
Not enough CFM. An outlet high with a hose end low in the boat will have significant "chimney effect" without a fan though.
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Old 20-01-2017, 16:45   #63
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Re: Should the engine bay blower be always on?

I think a lot depends on how your air intakes are set up as to when to use the blower(s).

I have 4 x Dorade type vents.
Two on each side under the Pilot House side windows.
(You can see them with blue fairing in this paint photo)

Small slots near the top, naturally aspirate the ER and 2 squirrel cage fans with hoses force air in, or out depending on how I switch them.

Tested room temperatures underway in tropics without fans and worst is about 110° F

My practice is to only turn on the blowers when approaching anchorage in calm waters and let run for 30 minutes after shut down to cool down the ER.

When motorsailing (especially to Windward) I prefer NOT to use the fans as speeding up the air intake will induce more salt saturated air into the machinery space.

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Old 20-01-2017, 17:52   #64
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Re: Should the engine bay blower be always on?

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OK, whatever.


A bit rude, would,t you say. Excuse me.
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Old 20-01-2017, 22:08   #65
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Re: Should the engine bay blower be always on?

Beneteau Group and other EU manufactured boats seem to include this feature. It may be a CE thing. No harm no foul. The engine is making noise anyway, and it keeps the air OK down below. If it dies after 15 years see how the engine runs without it and go from there.
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Old 21-01-2017, 02:39   #66
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Re: Should the engine bay blower be always on?

good morning from the canal du midi, which in places, is freezing over...
on my 30ft steel cruiser with its (new 2 yrs) nanni 43 hp engine I wired the blower to kick in when the engine is running, you really can't hear it over the engine. Its quite warm here in the summer and I regularly put my hand over
blower outlet (to make sure its blowing) and the air hitting my hand
would dry a womans hair nicely. I found that it was something I forgot with
the 636 merc that was replaced and the engine bay would get very hot.
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Old 21-01-2017, 03:35   #67
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Re: Should the engine bay blower be always on?

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Originally Posted by a64pilot View Post
So your intake is at the top of your compartment?
Mine isn't either, but the hot air is. I figure it will cost me about $5 a year to maintain the engine room blower like the factory built it.

There are I guess two ways to look at this

1. Factory was stupid and wasted time and money installing a blower unnecessarily
2. Factory knew what they were doing


Agree herewith. Mine runs full-time and dries out the teak at the outlet.

Question I have is whether such blower needs any maintenance? I couldn't find any recommendation on this. Silicon spray? Or else?

Thanks
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Old 21-01-2017, 06:03   #68
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Re: Should the engine bay blower be always on?

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Your point of possibly blowing fumes into the cabin by pressurizing the engine compartment is well taken. On the other hand, you don't want the engine compartment to be at less than ambient pressure. The trick here is to have enough openings to allow plenty of fresh air in to compensate for any exhaust fan.

As I posted, my (diesel) boat has no fan so I suppose the designers figured it all out before building the boats.

We haven't answered the OP's question but he never said if he had a gasoline or diesel powered boat and if he has a switch for the blower. Or if it's possible that a PO chaged things from the factory setup.
My engine compartment has two large hoses that access the transom. One is fitted with a high volume electric succion blower, and the other let air to replace the removed heated air. There is no négative pressure, and as far as i know no lack of air for the engine.
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Old 21-01-2017, 06:11   #69
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Re: Should the engine bay blower be always on?

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The Jenneau 409 is typically fitted with a 40hp Yanmar. The boat is fitted with an evacuation blower from the factory that is activated when the ignition is turned on. If, as the OP indicated, the blower is rated at 150CFM, that would provide, roughly, 2.3 air changes per minute to the 409's engine compartment.

FWIW...
A diesel engine has no "ignition". I've made that mistake myself a few times myself.

Anyhow, your post should answer the OP's question.
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Old 21-01-2017, 06:17   #70
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Re: Should the engine bay blower be always on?

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...............

There are I guess two ways to look at this

1. Factory was stupid and wasted time and money installing a blower unnecessarily
2. Factory knew what they were doing
One other way - Why do many diesel engine boats have no engine room fan? Are these factories stupid or did they know what they are doing?
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Old 21-01-2017, 06:29   #71
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Re: Should the engine bay blower be always on?

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One other way - Why do many diesel engine boats have no engine room fan? Are these factories stupid or did they know what they are doing?

Who are they Ron?
Sail Boats?
New design feature?
Thanks
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Old 21-01-2017, 06:30   #72
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Re: Should the engine bay blower be always on?

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...Why do many diesel engine boats have no engine room fan? Are these factories stupid...?
Parsimonious.
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Old 21-01-2017, 06:41   #73
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Re: Should the engine bay blower be always on?

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A diesel engine has no "ignition". I've made that mistake myself a few times myself.....
Ah...for the sake of the exercise...a diesel engine is an "internal combustion engine", no less so than a gasoline, kerosene or other fueled internal combustion engine whether reciprocating or turbine. To function, the fuel in an internal combustion engine must be "ignited" whether by a spark plug, glow plug or compression heating. If an engine utilizes an electrical power system for starting, the switch that activates such an "ignition" process, regardless of engine type, is nominally referred to as the "ignition" whether to simply activate the starter in a compression ignition system or to start and subsequently power the operation of a spark or glow-plug of that type ignition system. Non?

Never the less, if you prefer, by all means refer to the starter switch on you diesel(s) as whatever pleases you/fits you bill. Different ships, different long splices, Non?
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Old 21-01-2017, 15:18   #74
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Re: Should the engine bay blower be always on?

I call it ignition too, cause I don't know what else to call it. It's not just a starter switch as there is an "on" position that provides power to the alternator and arms the low oil pressure and overheat alarms
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Old 22-01-2017, 00:51   #75
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Re: Should the engine bay blower be always on?

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Originally Posted by a64pilot View Post
I call it ignition too, cause I don't know what else to call it. It's not just a starter switch as there is an "on" position that provides power to the alternator and arms the low oil pressure and overheat alarms
Indeed! Me too. Obviously it does not describe at all, what the system does, on a diesel engine, but what else do you call it?

By the way, for modern gasoline engines, the key isn't "ignition" either, in any literal sense. It powers up the computer, which will energize the ignition system (and fuel injection system, etc.) at the right moment, but not when you turn the key.

If there is a more correct term, I'd love to hear it.
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