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Repowering a 54' Donzi Sportfish

Discussion in 'Donzi/Roscioli Yacht' started by DOCKMASTER, Sep 5, 2019.

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  1. Capt J, Jun 27, 2020
    #321
    Capt J

    Capt J Senior Member

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    Glad to hear that. Sounds like you really hit the mark with the repower and really cannot ask for more, much better fuel economy and speed, new equipment, everything seems to be working as it's supposed to right out of the box (even props). I bet your family will have a great time on the boat.
  2. Capt Ralph, Jun 27, 2020
    #322
    Capt Ralph

    Capt Ralph Senior Member

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    Why are we up so late,,, again???
  3. Capt J, Jun 27, 2020
    #323
    Capt J

    Capt J Senior Member

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    LOLOLOL, took a nap this afternoon in between work. Worked 9am-1pm, came home, ate lunch and took a nap, went back out 4pm-6pm......it's too hot to work middle of the day.
  4. Capt Ralph, Jun 27, 2020
    #324
    Capt Ralph

    Capt Ralph Senior Member

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    This is funny. Near same here.
    Sipping a slow one now.
    Shopping for some large A/C junk for our own boat. Not fun.
    Fixing to crash finally now. Latter bro..

    And I thought I retired..
  5. PacBlue, Jun 27, 2020
    #325
    PacBlue

    PacBlue Senior Member

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    Sounds like you a achieved the best results possible - exceeding your expectations :)

    If you fill out a speed vs rpm chart, make sure and do a two way run to eliminate current effects.

    Happy boating!
  6. chesapeake46, Jun 27, 2020
    #326
    chesapeake46

    chesapeake46 Senior Member

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    Congratulations, that is great news.
  7. Capt J, Jun 27, 2020
    #327
    Capt J

    Capt J Senior Member

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    This is a good idea, as the motors are new, bottom is clean, etc. I'd also write down all pressures and temperatures. Start at 1000 rpms and do 5 minutes every 200 rpms.
  8. Donzi 54, Jun 27, 2020
    #328
    Donzi 54

    Donzi 54 Member

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    Great job giving her new life. You and your crew did a hell of a job and have much to be proud of.
  9. Capt Ralph, Jun 27, 2020
    #329
    Capt Ralph

    Capt Ralph Senior Member

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    Cat should have the data on lap-top. Ask them for a thumb drive copy and print out.
    Good to compare to in the years to come.
  10. Capt Ralph, Jun 27, 2020
    #330
    Capt Ralph

    Capt Ralph Senior Member

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    Sad part is, this fine crew is not available to the rest of us. To darn far aweigh...
    :p:p:p
  11. Capt Ralph, Jun 27, 2020
    #331
    Capt Ralph

    Capt Ralph Senior Member

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    Pre load this question and have it waiting for you when your back in range;
    Is da wifie happy?
  12. Donzi 54, Jun 27, 2020
    #332
    Donzi 54

    Donzi 54 Member

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    Agree. At least you can bribe them with warmth and sunshine.
  13. rtrafford, Jun 28, 2020
    #333
    rtrafford

    rtrafford Senior Member

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    Agreed. Very worthwhile effort, albeit minimal effort. Will give you a terrific reference material for trips, planning, and you'll be quick to identify the sweet spot for your own vessel's setup. Further, you'll be able to identify problems going forward, be them in the engines or on the hull. I recall my sweet spot was in the low 70% load range, but every boat and setup is unique. Best of luck.

    Also noteworthy, I developed a strong opinion that the noise made by my Cats raised fish. I hope you find the same.
  14. PacBlue, Jun 28, 2020
    #334
    PacBlue

    PacBlue Senior Member

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    The inline-6 C18’s just have a unique mechanical ‘symphony”. Hard to be as smooth as a V engine but they have other attributes that shine in an engine room, especially more space between the engines for the guys that like to check things out themselves.
  15. DOCKMASTER, Jul 27, 2020
    #335
    DOCKMASTER

    DOCKMASTER Senior Member

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    Got my complete survey and valuation done. Boat was rated "above average" overall which is one step under Bristol as the highest. Not a single recommended repair or change and lots of comments of things like "exceptional" and "very good" and "outstanding" from surveyor. Valuation increased by $240k. Surveyor went $65k higher than my suggested valuation and he really wanted to go higher. He said this was lowest he could go and should be higher. I didn't push him either way and let him decide where to go.

    So I guess it's time to close this thread then. This has been a very fun project and I couldn't be happier with the outcome. For me, I like the project aspect almost as much as the outcome. We are already discussing the next projects. I'll start a thread but here's the current plans for this off-season which starts now unfortunately due to COVID.

    1. Renew flybridge console. Glass in all holes, raise the dash some, relocate items and increase seating height of bridge settee for better visibility for guests.
    2. Install SeaDeck or similar on flybridge deck
    3. Replace cockpit teak with SeaDeck or similar
    4. Fabricate and install hinges for fishbox lids
  16. Capt Ralph, Jul 27, 2020
    #336
    Capt Ralph

    Capt Ralph Senior Member

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    Final fuel - speed - rpm values on loaded boat? Accepted by Cat? Son going to Cat school soon?
  17. chesapeake46, Jul 27, 2020
    #337
    chesapeake46

    chesapeake46 Senior Member

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    Hate to see the end of this thread because I've thoroughly enjoyed.
    Happy for you & the outcome.
    Outstanding
  18. leeky, Jul 27, 2020
    #338
    leeky

    leeky Senior Member

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    Me, too.
  19. DOCKMASTER, Jul 27, 2020
    #339
    DOCKMASTER

    DOCKMASTER Senior Member

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    All final values at or improved from what I reported already. With a little playing around I can pretty easily get to 28 knots cruise at 80% load, right about 42 gal/hr per side. . I was mostly cruising around 70%-72% load at 25-26 knots burning 35 gal/hr.

    Yes, all certified by CAT. Got all my final documents. The most important of which is my 5 year Platinum protection warranty certs. Of which, I hope to never need :)
  20. Capt J, Jul 27, 2020
    #340
    Capt J

    Capt J Senior Member

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    Those are GREAT numbers. I'd be extremely happy with the results compared to what you had with the 12v92's.
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