Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Slow Throttle Response

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  • July 25, 2023 at 6:14 pm #152171

    Kevin Squires
    Participant
    Vessel Name: Small Change
    Engines: 6CTA 8.3
    Location: Cape Breton
    Country: Canada

    I’m looking at the purchase of a 38 foot fishing boat with a 300 hp 6CTA 8.3, approx 6500 hours. Compared to my former 34 foot boat with a 315hp 6BTA 5.9, throttle response seems quite slow, almost like the hull is severely fouled. Any thoughts on whether this is an issue, or how to decide whether it is a problem? Thanks

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  • July 26, 2023 at 6:27 am #152191

    JimmyK
    Participant
    Vessel Name: Incognito
    Engines: 2 x 6BTA 370s
    Location: Boston
    Country: US

    ‘Slow’ means different things to different people.

    A 38 foot boat with a single 300hp engine is going to be ‘slow’ on a good day IMO, so could be totally normal.Ā  With that said, if it’s billowing black smoke and takes 60 seconds to get on plane, that’s a different type of slow.

    How long does it take to get on plane?Ā  What did it hit for WOT rpm?

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    Tony Athens
    July 26, 2023 at 4:27 am #152187

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

    Hull design is an important factor.Ā  A boat with a flat stern section will go from hull speed to planing quite seamlessly compared to a V hull.Ā  Tell us about the two boats.

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