Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Engine Performance

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  • June 11, 2019 at 8:20 am #73288

    Mark D Sperling
    Participant
    Vessel Name: Tranquility
    Engines: Cummins 6BTA5.9 Diamond Series
    Location: Lake Champlain
    Country: United States

    I have twin 6BTA5.9 Diamond Series engines with 475 hours on them. What’s the top performance (RPM’s) they should deliver?

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  • June 11, 2019 at 1:49 pm #73316

    Mark D Sperling
    Participant
    Vessel Name: Tranquility
    Engines: Cummins 6BTA5.9 Diamond Series
    Location: Lake Champlain
    Country: United States

    Serial Number

    Rob,

    I’ll get the numbers this weekend as I don’t have them in my office.

    Mark

    June 11, 2019 at 12:51 pm #73313

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    Mark,
    Post a serial number so we can be 100% as to ID’ing your engine.

    June 11, 2019 at 9:55 am #73299

    Mark D Sperling
    Participant
    Vessel Name: Tranquility
    Engines: Cummins 6BTA5.9 Diamond Series
    Location: Lake Champlain
    Country: United States

    Thanks

    Thank you.

    Mine is topping out at 2900-3000 right now which I guess is the target range. Yes, that’s my engine, 2004.

    It was reading this when surveyed before I bought it.

    Best regards,
    Mark

    June 11, 2019 at 9:37 am #73298

    firehoser75
    Participant
    Engines: Cummins 6BTA M3-330 HP
    Location: Nanaimo, BC
    Country: Canada

    Hi Mark,
    Not totally sure about what exact engine you have, but mine is a 6BTA 5.9 L 330hp (2002 Diamond Series) and it is rated at 2800 rpm. You should be able to reach 2900+ rpm at WOT with the boat loaded how you use it and a clean bottom (if that is your engine).

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