290 ratio

Discussion in 'Diesel Engines' started by Twinluis, Aug 12, 2015.

  1. Twinluis
    Joined: Jan 2014
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    Twinluis Junior Member

    Hi Which outdrive ratio will work on Volvo 290 DP to mate a Volvo kamd42 230hp? Thankssss
     
  2. Çemberci
    Joined: Apr 2007
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    Çemberci Senior Member

    Aqua

    Aqua AQ 290 A 290 bhp 5200 rpm
    290 A Ratio 1.61 , 1,89, 2.15 : 1

    DP ratio 1.78 , 1.95 , 2.30 : 1
     

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  3. baeckmo
    Joined: Jun 2009
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    baeckmo Hydrodynamics

    You should use the 1.78:1 ratio with this engine.
     
  4. Twinluis
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    Twinluis Junior Member

    Thanks guys for your quick answer.Now I know where to start . Thank you
     
  5. gonzo
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    gonzo Senior Member

    The rated RPMs of the engine is about 3900, so a low gear ratio is appropriate. However, it has to be matched to what the target speed is.
     
  6. baeckmo
    Joined: Jun 2009
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    baeckmo Hydrodynamics

    The ratio recommended above (1.78:1) will give an advance ratio ("lambda") from ~0.7 to 1.4 in the speed range 20 to 40 knots, which is a range where the pitch/diameter ratio will result in optimum propulsive efficiency. With the restriction on prop diameter you have with the antiventilation plate, you would not be able to get better thrust at lower speeds if you used a lower propshaft speed, since that would require bigger prop diameters!

    The other ratios are used for the four cyl diesels and for the gasoline Engines.
     

  7. Twinluis
    Joined: Jan 2014
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    Twinluis Junior Member

    thanks

    thanks Gonzo for the complete and detailed answer about my question thanks again
     
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