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  1. #41
    Join Date
    Sep 2012
    Location
    Henley
    Posts
    796

    Default Re: Diesel engine room blowers

    Interesting thread. I would have thought fans sucking in would be about keeping engine room cool if you're pootling around at low rpm. At high rpm with engine on boost, I would have thought air would be replaced as quick as engine consumes it, as long as there's no restriction on the engine bay intakes.

    At sea level remember air pressure is 14.7psi, so it will force its way in to engine room as the engine consumes air.

    Air pressure at work


  2. #42
    Join Date
    Jan 2012
    Location
    Reading
    Posts
    491

    Default Re: Diesel engine room blowers

    Quote Originally Posted by BruceK View Post

    Thank you for the pm link to the temp data logger. What a great piece of kit for no money. You should post it up here, I am sure others may find it useful too
    Please post a link to those temp data loggers.
    I am currently looking into the Hunton engine bay temps and trying to get more air in and also have some vents in the stern to actually create a bit of airflow in the engine bay,

    Last time out on the boat (UK based) I ran for a bit the the engine bay (sunpad Lid ) closed, then I ran for some time with the hatch open by about 1 -2 inches, I actually noticed that doing this the engine temps dropped by a few degrees.

  3. #43
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    3,130

    Default Re: Diesel engine room blowers

    Assasin pointed me to these which will help me to see what is happening. They are programmable.

    https://uk.rs-online.com/web/p/data-loggers/4666115/

  4. #44
    Join Date
    Jun 2010
    Posts
    794

    Default Re: Diesel engine room blowers

    Quote Originally Posted by PilotWolf View Post
    Not trying to argue but our batteries are in the engine rooms, engine and generator start - no house batteries as always on generator or shore power. They're not vented separately. Our big engines (relative to most leisure craft) will run without fans on albeit hotter. I'm inclined to suggest unless the engine room is air right the engines will draw air through any opening to the outside and the fans are there primarily for cooling.

    W.
    I wouldn't disagree with that PW and as already stated it depends upon many factors, some of which you have highlighted so no arguments at all, just an interesting debate with many good issues raised and pojnts made.
    I am old and wise because i was young and stupid.

  5. #45
    Join Date
    Jun 2010
    Posts
    794

    Default Re: Diesel engine room blowers

    I would expect they are Bruce as petrol vapours are volatile and any leaks of fuel will turn into an explosive mixture in air; you can look them up if your fans have their makers name plate and model numbers on them and check their specifications online usually.

    You're welcome for the link.
    I am old and wise because i was young and stupid.

  6. #46
    Join Date
    Apr 2017
    Location
    Denmark
    Posts
    309

    Default Re: Diesel engine room blowers

    Ocqueteau 8.15,200hpNanni.
    Buster Sun R,25 hp outboard

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