determining Engine size?

Discussion in 'Diesel Engines' started by wildbill, Feb 21, 2012.

  1. Dhutch
    Joined: Oct 2008
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    Dhutch Junior Member

    I like it!
     
  2. WestVanHan
    Joined: Aug 2009
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    WestVanHan Not a Senior Member

    Well you tell us nothing,and expect us to guess EVERY THING about the boat-displacement/semi/planing/pleasure/fast/slow,etc etc so I guessed slow and cheap.
    Would you be happier if I told you 1400 hp and 300 litres an hour?


    Do you phone your doctor and say "it hurts, give me pills"
     
  3. wildbill
    Joined: Feb 2012
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    wildbill Junior Member

    will take some pics today.... post tomorrow
     
  4. wildbill
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    wildbill Junior Member


    haha.... fair enough .... no... wouldn't be happy with that at all ... ... here's some pics ....
     
  5. wildbill
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    wildbill Junior Member

    commercial fishing vessel 20 mtrs in length .... each stabilizer will hold six 5 mtr skiffs .....

    6 - 7 knots is adequate but it would be nice to have the extra power if i needed it .... keel length is 45' ... stem to stern is about 65'..... beam is 9' ..... that's about all i got so far......
     
  6. sabahcat
    Joined: Dec 2008
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    sabahcat Senior Member

    So what do the other boats that size in the phils have?
     
  7. Key Ki
    Joined: Mar 2011
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    Key Ki New Member

    I would suggest a "slightly used" Isuzi, after the Jeepney has thrashed it. Then marinize. I sold a Volvo Penta 100 hp in Davao 9 months ago, that may have done the trick for you.
     
  8. wildbill
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    wildbill Junior Member


    i am leaning towards the a volvo i think....thx
     
  9. messabout
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    messabout Senior Member

    Fuel consumption can be reasonably estimated by using BSFC figures that are available from diesel engine manufacturers but seldom from gas engine manufacturers. BSFC means brake specific fuel consumption. Typical gasoline engines will have a figure of about 0.5. It means that the engine will consume 0.5 pounds of fuel per horsepower hour. If for example, the engine were required to maintain 30 HP for an hour then .....0.5 x 30 x 1 = 15 pounds of fuel. Notice that the consumption figure is in pounds, not gllons or litres. With gasoline at about 6.5 pounds per gallon, that would translate to 2.3 gallons per hour.

    Gas engines will have a sweet spot where the BSFC figure is smallest, usually at or near the torque peak. High performance, race type, gas engines (not what you would use in a boat), can get BSFC figures in the 0.45 range. When using this method for diesel engines you must use the weight of diesel fuel in the equation.
     

  10. wildbill
    Joined: Feb 2012
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    wildbill Junior Member


    thx messabout ....that is an equation i can work with .......wb
     
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