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Detroit Johnson Tower 6-71 diesel engine

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    Detroit Johnson Tower 6-71 diesel engine

    I'm looking at a pair of Detroit JT 671s.
    any experience? any input? let's hear it...
    Joon, Kathy, Jaden & Tristan
    Uniflite 42 AC, DD 671N
    93 3058 sold
    92 2855 (day boat)
    91 Fourwinns 205 (lake boat)
    Longbranch WA
    Life is Good

    #2
    Those are 2 stroke engines, noisy, oil leaky as a rule, heavy-heavy-heavy.
    Pat says: DO-IT-RIGHT THE FIRST TIME!

    Bayliner 3870 "ALASKA33)
    Twin 350 GM power
    Located in Seward, AK
    Retired marine surveyor

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      #3
      Originally posted by Ruffryder View Post
      I'm looking at a pair of Detroit JT 671s.
      any experience? any input? let's hear it...
      You will definitely hear it.... well as long as your hearing holds out.

      Detroit 2 strokes were a awesome thing when developed (1930's) and lasted in basic form for decades. They are simple mechanically with no electronics and a clever high pressure fuel system.

      I would probably steer away from them for reasons posted above.
      1989 3888
      Nobody gets out alive.

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        #4
        +1


        They were extremely good engines and ultra popular in their day. They are noisy, and heavy. Even though they are 2-strokes, they are quite complex. The number of mechanics that know how to work on them is rapidly dwindling.

        Get them if you are looking to secure your mooring buoy.


        1999 3788, Cummins 270 "Freedom"
        2013 Boston Whaler 130 SS
        Anacortes, WA

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          #5
          Ah, but there is nothing like the sound of Detroits.
          Started boating 1955
          Number of boats owned 32
          Bayliners
          2655
          2755
          2850
          3870 presently owned
          Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner

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            #6
            Many will agree that these were just BOMB proof,will run near forever.
            Yes Doug, like the sound of detroits, love to hear them rumble!
            Each engine only weighs about 3000 LBS , but what the heck,
            they are already in a brutally heavy boat... 40,000 LBS I'm guessing.
            Joon, Kathy, Jaden & Tristan
            Uniflite 42 AC, DD 671N
            93 3058 sold
            92 2855 (day boat)
            91 Fourwinns 205 (lake boat)
            Longbranch WA
            Life is Good

            Comment


              #7
              I recall when I was in 10th grade and dad bought our first tandem axle diesel grain truck. It was a 1980 Ford with a Detroit 6-71 in it. I sooo loved driving that thing. Running 80K+ fully loaded, and it would go as fast as I wanted it (this was something completely new to me - our gassers had to get a run at any hills - some of which our hired hands never made it up when fully loaded and you missed a down shift). High revving and smooth...but it wasnt the old 2 cycle either.
              97 2859

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