Repowering to Diesel - Sailboat

Discussion in 'Diesel Engines' started by AtlanticPeter, Oct 13, 2010.

  1. AtlanticPeter
    Joined: Oct 2010
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    Location: Atlantic Canada

    AtlanticPeter Junior Member

    Fair price for 1GM10

    As mentioned the Yanmar 1GM10 is a candidate. I received a quote for $6300 CDN from a major dealer in Eastern Canada. Could I do better buying in the US taking taxes and duty into consideration?
     
  2. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    Nobody's mentioned prop (mis)match?

    If your prop is too big it will tend to cause these problems and you won't get rated power. No reason that motor shouldn't give satisfactory performance at cruise rpm with a clean bottom. Try the following-

    Tie to a dock and go full throttle forward for about a minute at report engine RPM and the spec red line. You ought to be able to get near red line, say 150 rpm less. If you are 600 rpm less you have too much prop for in and out of the marina duty. If you want extremely efficient cruise that is different, but since you couldn't burn 3 gal. a day if you tried, that is getting pretty silly. Prop description and tranny gearing would help at this point also. There is a terrible "bigger is always better" misunderstanding out there, and somebody may have fiddled with the prop. There doesn't happen to be a cute little "spare" 12 X 13 two blader in a laz somewhere, does there? (12 X 13 is a guess, couldn't find stock prop in a quick search)
     
  3. FAST FRED
    Joined: Oct 2002
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    Tie to a dock and go full throttle forward for about a minute at report engine RPM and the spec red line. You ought to be able to get near red line, say 150 rpm less.

    Not if the prop and engine are properly matched to the boat.

    A boat is MOVING and that is taken into consideration when spercifying the proper pitch.

    Big difference between zero K and 5K or 6K the usual sailboat will cruise at.

    BOllard (0K) pull is hardly a requirement for a sail boat .

    The fact that the cruisers prop has "too much" pitch is hardly a problem docking where the engine is usually at idle , and speed is controlled by going in and out of gear.

    Any proper set up cruiser will see no where near 150 less than full RPM tied to a sea wall.

    The proper chosen prop will allow the boat to cruise at a low (QUIET!) rpm.

    FF
     
  4. michael pierzga
    Joined: Dec 2008
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    Location: spain

    michael pierzga Senior Member

    Don't know how they do it on powerboats but for sailboats you choose the best guess prop pitch diameter then run the engine..when you feel the prop is to small ,you add pitch and watch the exhaust temperature...exhaust temp is the key indicator for choosing the max size prop.
     
  5. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    you add pitch and watch the exhaust temperature...exhaust temp is the key indicator for choosing the max size prop.

    WE do it differently , with in reason we select the largest reasonable prop diameter that will fit on the boat , match the tranny ratio to the diameter and then select the pitch with the boats cruise speed in mind..

    Since diameter is far more a determinant of HP absorbed , and therefore thrust , this usually is great.

    The only hassle are the "racers" that will use the smallest diameter ,huge pitch (less drag under sail) spun with a lighter 1-1 tranny and only want 5K in calm water for the race measurement.

    FF
     

  6. angel187
    Joined: May 2013
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    Location: lake erie

    angel187 Junior Member

    I know this is an old thread, but i too had a vire 7, I just posted my diesel refit for under 500$ thread. I'm not sure if you still run the vire7 but this may be an interesting read for you.

    http://www.boatdesign.net/forums/diesel-engines/repower-gas-diesel-under-500-a-47090.html
     
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