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  1. #1
    Join Date
    Sep 2013
    Location
    Bennett, N.C.
    Posts
    31

    Default Steam from Exhaust?

    Hey guys need some help took boat out for the first time this year at idle noticed steam from exhaust temp gauge never got above 180.Hoping it's from hot exhaust in cooler water,air temp today was around 80 and water temp mid 60's any idea's?
    2004 Mobius LSV 340 HP
    Gravity III Ballast

  2. #2
    Join Date
    May 2013
    Posts
    180

    Default

    Physics..........it's normal

  3. #3
    Join Date
    Oct 2013
    Location
    Ft. Collins, CO
    Posts
    179

    Default

    Yeah it's normal. It's the same effect that you see in a car's exhaust in cold weather. When the engine is cold, you'll see a pretty constant bit of steam. Then I tend to see it when you power up from an idle. Depending on conditions, you may continue to see a little bit constantly.

    What is your normal operating temp? 180 actually seems a bit warm. Certainly not bad, but usually boats have 160 degree thermostats in them. If someone put an automotive thermostat in there, it would be at about 190.
    2007 Mobius LSV
    1989 Sanger Skier DX - sold

  4. #4
    Join Date
    Sep 2013
    Location
    Bennett, N.C.
    Posts
    31

    Default

    Thanks...it usually runs around 175 most of the time.Going to change the impeller just in case we cleaned out the water strainer last week.
    2004 Mobius LSV 340 HP
    Gravity III Ballast

  5. #5
    Join Date
    Jan 2009
    Location
    Bennett NC
    Posts
    97

    Default

    Was Gary driving? He would make her steam. LOL
    2007 Moomba Outback V
    2007 F-250 PSD CC

    2012 Fuse 40
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  6. #6
    Join Date
    Sep 2013
    Location
    Bennett, N.C.
    Posts
    31

    Default

    He can't drive a real boat!! lol
    2004 Mobius LSV 340 HP
    Gravity III Ballast

  7. #7
    Join Date
    Nov 2010
    Location
    Katy, TX
    Posts
    4,187

    Default Steam from Exhaust?

    Mine always runs just a tad over the 160 mark, I would say 170-175. Don't think anything is wrong with this


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    David

    2008 Mobius LSV, Gravity III , Wake Plate, Z5, Exile SX65c's, Exile XM9s, Exile XI12D, Exile Harpoon, Exile SM600.1 , Exile Xi800.4.

  8. #8
    Join Date
    May 2009
    Location
    Carlton Oregon
    Posts
    6,029

    Default

    Temps are pretty stabil till you reach the 200 mark. Since the cooling system is not a closed system like your car, and you are fresh water you can't go over the 212 or it boils and causes damage.

    The best thing you can do for the boat if it runs hot is IDLE, this will flush the most amount of cool water though the engine and allow the engine to produce the least amount of residual heat from idling.

    Steam is absolutely normal behind a boat when ever the water temp of the lake is less then the engine water temp. you will see it more when the air temp is also low.
    Malo <--- Means--Evil or Mean One. This explains a lot.
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  9. #9
    Join Date
    Sep 2013
    Location
    Bennett, N.C.
    Posts
    31

    Default

    Well changed the impeller last night...it was chewed up pretty bad and had a lot of small pieces in the J hose.Got lucky this time!
    2004 Mobius LSV 340 HP
    Gravity III Ballast

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