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cummins 6CTA 450 DIAMOND SERIES

Discussion in 'Sport Yachts/Yachts' started by JoAna, Sep 21, 2020.

  1. JoAna

    JoAna Member

    135
    Feb 10, 2018
    San Diego, CA
    2005 420DB
    Cummins 6CTA 8.3 450HP
    Does anyone know what the factory specs are for the idle speed??
     
  2. my3sons

    my3sons Well-Known Member GOLD Sponsor

    Feb 24, 2009
    NY (Lake Erie)
    2004 400DB, Onan 9 kw Gen, Highfield RIB,
    Cummins 6CTA
    Low 650 but 625 is ok if they run smooth
    High 2920 - 3020 but I've not seen a healthy one turn less than 2950 on the high side
     
    JoAna and Blueone like this.
  3. knot at work

    knot at work Member

    88
    Sep 6, 2014
    Virginia Beach, va
    2001 460 Sundancer, 430 Cummins, Axiom 12", 650 AIS, SH 5500, Sat tv, 10kw Westerbeke.
    450 Cummins
    The engine plates on my motors state 600 RPM as idle and 2600 as max. If boat is propped correctly, it should hit 2650 to 2700.
     
  4. NotHerDecision

    NotHerDecision Well-Known Member PLATINUM Sponsor

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    You can max out the rpm’s at ~3k in neutral after a full run and the engines are warm.
     

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