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37 Bertram 6v92 550HP shaft size

Discussion in 'Bertram Yacht' started by Breckster, Aug 17, 2018.

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  1. Breckster

    Breckster Member

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    im told to expect 2500hrs.. but i just want to have something "ready" if needed. the guys that have done work on them have said, "A LOT of life left in those girls!" haha..
  2. Capt Ralph

    Capt Ralph Senior Member

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    Take good care of them and keep your foot off the last few RPS.
  3. Capt J

    Capt J Senior Member

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    There were also BIVENS 16v96's that put out 1700 HP. I know a boat that had those. I also knew someone that ran a boat with 24v71's and they were always constant problems with them, but they had so many hours on them.
  4. Capt Ralph

    Capt Ralph Senior Member

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    Naw, the 24V71s were sweet. Usually chromed out under clear deck floors.

    I did not realize they did mate the V8V92 blocks. Don't know how Bivens bored out wet liners to make a 96. Must have been crank throw mods.

    Just found this; Yep, crank mods..

    https://www.yachtforums.com/threads/16v96.11262/
    Last edited: Aug 1, 2019
  5. Capt J

    Capt J Senior Member

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    He made A LOT of mods for 92's. He even has a patent on changing the valve geometry and several other items. The custom SF from that era had Bivens......Montereys, Jim Smiths, Tributes, etc...….Merritt OTOH seemed to love those 903 cummins. Interesting read, as Bivens was a true mechanical engineer instead of just another DD hot rodder……..

    http://www.freepatentsonline.com/5590625.html
  6. Capt Ralph

    Capt Ralph Senior Member

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    Lots of folks were re-inventing the wheel back then.
    The original PanTropic Marine was doing some heavy DD mods also.
    I was glad when Penski came on and shut down most of the heavy mods to DDs.
    DD was getting a bad rap and not their fault. You can only get so much H P from an engine for so long.
  7. Capt Ralph

    Capt Ralph Senior Member

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    I was doing the same rocker mods on GM MK IIIs.
    Just needed longer valve stems and springs. FRP valve covers gave me the room.
    Finally found an old school cam grinder that lit up my motors.

    Now, You tell anybody I worked on Gas engines I will have to beat you with a stale noodle.. Just between us,, rite??