|
|
20-01-2017, 15:48
|
#61
|
Registered User
Join Date: Mar 2009
Location: Homer, AK is my home port
Boat: Skookum 53'
Posts: 4,042
|
Re: Should the engine bay blower be always on?
They told me to, too, but I forgot to...
__________________
" Wisdom; is your reward for surviving your mistakes"
|
|
|
20-01-2017, 16:05
|
#62
|
Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,483
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by Crew of Turning
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.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
|
|
|
20-01-2017, 16:45
|
#63
|
CF Adviser
Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 10,280
|
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.
|
|
|
20-01-2017, 17:52
|
#64
|
Registered User
Join Date: Dec 2010
Location: Marion, Ma
Boat: Little Harbor 38
Posts: 301
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by Terra Nova
OK, whatever.
|
A bit rude, would,t you say. Excuse me.
|
|
|
20-01-2017, 22:08
|
#65
|
Registered User
Join Date: Jan 2016
Location: San Diego, CA
Boat: Beneteau 40.7
Posts: 343
|
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.
|
|
|
21-01-2017, 02:39
|
#66
|
Registered User
Join Date: Aug 2016
Location: on/off canal du midi, france
Boat: 1975 30 ft dutch steel cruiser
Posts: 27
|
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.
|
|
|
21-01-2017, 03:35
|
#67
|
Registered User
Join Date: Jan 2017
Location: Brussels (Belgium)
Boat: Najad 373
Posts: 277
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by a64pilot
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
|
|
|
21-01-2017, 06:03
|
#68
|
Registered User
Join Date: Sep 2007
Boat: GibSea 472
Posts: 520
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by rwidman
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.
|
|
|
21-01-2017, 06:11
|
#69
|
Registered User
Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 5,176
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by svHyLyte
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.
__________________
Ron
HIGH COTTON
|
|
|
21-01-2017, 06:17
|
#70
|
Registered User
Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 5,176
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by a64pilot
...............
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?
__________________
Ron
HIGH COTTON
|
|
|
21-01-2017, 06:29
|
#71
|
Registered User
Join Date: Aug 2012
Location: PNW
Boat: Bruce Roberts Ketch 40
Posts: 477
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by rwidman
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
|
|
|
21-01-2017, 06:30
|
#72
|
Registered User
Join Date: Apr 2007
Location: Marina del Rey, California
Boat: President 43 Sportfish
Posts: 4,105
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by rwidman
...Why do many diesel engine boats have no engine room fan? Are these factories stupid...?
|
Parsimonious.
__________________
1st rule of yachting: When a collision is unavoidable, aim for something cheap.
"whatever spare parts you bring, you'll never need"--goboatingnow
"Id rather drown than have computers take over my life."--d design
|
|
|
21-01-2017, 06:41
|
#73
|
Registered User
Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,961
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by rwidman
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?
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
|
|
|
21-01-2017, 15:18
|
#74
|
Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
|
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
|
|
|
22-01-2017, 00:51
|
#75
|
Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Helsinki (Summer); Cruising the Baltic Sea this year!
Boat: Cutter-Rigged Moody 54
Posts: 33,764
|
Re: Should the engine bay blower be always on?
Quote:
Originally Posted by a64pilot
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.
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|