Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Horsepower

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  • May 20, 2019 at 3:16 pm #69786

    Guy Teichner
    Participant
    Vessel Name: Sybarite
    Engines: Cum 6CTA 8.3
    Location: Florida
    Country: United States

    Cummins Diamond 450C engines Serial # 45722004 & 45716893
    What is the rated horsepower of these engines?

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  • May 21, 2019 at 5:23 am #69816

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    BHP of a "450 Diamond"

    QSOL lists your engine as a 1998 build of a CPL 2172 450 Diamond. In another place, they show it as a CPL8089 version of the same engine–ODD, but it does not really matter as the only difference between the two CPL’s is the injector nozzle– 4 hole vs. 5 hole and that does not change the HP ratings..
    Both Power curves attached.

    It’s 430 BHP at 2600 RPM in a test cell……For propping purposes/calculations, use 430 BHP at 2700-2750 RPM..

    What does your data plate show as to the CPL? It would not be the 1st time QSOL was screwed up.

    Ever read this?

    https://www.sbmar.com/articles/the-cummins-6cta-8-3-marine-engine-story/

    Tony..

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