Yanmar - Dosan or Sole Diesel?

Discussion in 'Diesel Engines' started by yodani, Aug 12, 2014.

?

Most reliable heavy duty engine in 180-240hp range

  1. Dosan

    1 vote(s)
    25.0%
  2. Yanmar

    3 vote(s)
    75.0%
  3. Sole Diesel

    0 vote(s)
    0.0%
  1. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
    Likes: 110, Points: 63, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    "I have heard many theories about running diesels at low power, generators are an example - 1500rpm for 30.000h ."

    Do not confuse low RPM with low power.

    A good low RPM installation will be using 75 or 80% of the power the engine can generate at THAT! RPM. not at max RPM.

    This is why many vessels will spend the bucks and install a CPP.
    The propeller load can be increases at low RPM.

    When a 2100 rpm engine has a fixed prop pulling back to 1200 or 1500 the prop load at that RPM is so low the engine is no longer operating loaded enough , and can easily burn 50% more fuel per HP.

    A BMEP graph or fuel map will show just where the best operating range RPM & Load HP is.

    If you can find the Cummins , that would be my choice as so many are in cars and trucks parts will be cheaper (maybe 1/2 or 1/3 ) of a marine small volume conversion.

    Ask any Volvo owner,,,,about the price of unobtanium parts.
     

  2. yodani
    Joined: Nov 2010
    Posts: 190
    Likes: 2, Points: 18, Legacy Rep: 16
    Location: Danube Delta

    yodani Senior Member

    aussietrev thanks for the reply. Parts will not be a big problem as the dealer here is Watermota and they are serious. I think I will go with Dosan or Scania in the end. Will see how the final price will be. Will also change the propeller to a 4 blades and see what the results will be. I was thinking about a Kort nosel but I am afraid it will suck wood from the bottom and get clogged...

    Efficiency and reliability are my two goals... Fast Fred. I think I will power according to the calculations so will go with 180-250hp and appropriate propeller. I will keep those engines loaded :) ...

    Cheers
     
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