340 Prop Size - help

Discussion in 'Sport Cruisers' started by Jambrin, Aug 2, 2015.

  1. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    I am curious about the result also.
     
    Last edited: Dec 20, 2015
  2. Mittens

    Mittens Active Member

    598
    Mar 5, 2017
    Huntsville, AL
    2002 340 Sundancer, All Cherry Cabin, Black Canvas.
    8.1 Mercs, V Drives, 4.5kw Westerbeke.
    So what ended up being the ticket for a 8.1,v drive? Factory being 3b-18x22...
     
    Last edited: Mar 26, 2017
  3. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    Yes i'd like to know. I had my props re-pitched from 21 and 21.5 to 22 and 22.5 this winter. My WOT was at 4700, so now I should be around 4500, still within range.
     
    Last edited: Mar 26, 2017
  4. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    I know this is an old thread, but I figured I'd update for peoples info. I'm now at 22 and 22.5 with a large .125 cup. I'm right at 4600 rpm WOT. I would love to see what 23 Acme's would do.
     
  5. Mittens

    Mittens Active Member

    598
    Mar 5, 2017
    Huntsville, AL
    2002 340 Sundancer, All Cherry Cabin, Black Canvas.
    8.1 Mercs, V Drives, 4.5kw Westerbeke.
    But still the 3 blades?
     
  6. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    No these are 4 blades
     
  7. Mittens

    Mittens Active Member

    598
    Mar 5, 2017
    Huntsville, AL
    2002 340 Sundancer, All Cherry Cabin, Black Canvas.
    8.1 Mercs, V Drives, 4.5kw Westerbeke.
    So your paining 22/22.5p large cup, 4 blades to 4600 on 8.1s ?

    And a 99-02 340 hull?
     
  8. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    It's a 2004, 8.1's. Yes full fuel and packed with beer and wine. I cruise at 3450 at 28.5 to 29 mph. WOT is right at 4600. This is on my garmin gps and phone. I'm trying to cruise at 30 to 31mph. If I run the rpm to 3600 I can get to 31, but I dont want to run there.
     
  9. Jimmy Buoy

    Jimmy Buoy Well-Known Member

    Dec 3, 2008
    Sarnia, Ontario, Canada
    340 Amberjack
    twin 8.1S 370 Hp + 4.5 Westerbeke Genset
    My Amberjack came with factory 4 blade Hi Torque props both of which are 18x21" 1.5" bore which tops out at 4500 RPM with the 8.1's
     
  10. Mittens

    Mittens Active Member

    598
    Mar 5, 2017
    Huntsville, AL
    2002 340 Sundancer, All Cherry Cabin, Black Canvas.
    8.1 Mercs, V Drives, 4.5kw Westerbeke.
    Cool. Need to get my hands on a set and try them on mine.
     
  11. mnm99

    mnm99 Well-Known Member

    Oct 2, 2015
    Long Island
    2004 340 SeaRay Sundancer
    Twin 8.1 Merc
    These are my props now. I know they are Nibral , but not sure what kind. I'd really like to see what 23.5 pitch ACME can do. At $1800 each I don't know if I'll be finding out too soon. thumbnail1.jpg thumbnail.jpg
     

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