Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › How much Boost

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  • September 16, 2020 at 2:12 pm #103934

    James Graham
    Participant
    Vessel Name: WIDGEON
    Engines: 330 B
    Location: Cohasset, MA
    Country: USA

    Is there a spec’d amount of boost for a 330B at various RPM’s?
    Currently getting about 7# boost at 2250. Engine tops out at 2850.
    Runs good, runs efficiently, just wondering.
    Does load effect boost?
    Thanks,
    Jim

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  • September 17, 2020 at 5:16 pm #103977

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

    Boost is tied into engine by the engines load.. No load (neutral 2200, 2400, 2600, etc = NO BOOST).. 100% full load on you engine pushes 25-27 PSI when all is 100% up to spec & under “perfect conditions”…

    The condition of the engines aftercooler and turbo will also affect boost as a secondary part of the equation..

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