Click for Westport Click for Burger Click for Llebroc Click for Fendertex Click for Seacoast

Repowering a 54' Donzi Sportfish

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

You need to be registered and signed in to view this content.
  1. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    12,494
    Location:
    Fort Lauderdale
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL
    Why are we up so late,,, again???
  3. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    12,494
    Location:
    Fort Lauderdale
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL
    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

    PacBlue Senior Member

    Joined:
    Jan 9, 2009
    Messages:
    1,941
    Location:
    Dana Point, Ca
    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

    chesapeake46 Senior Member

    Joined:
    Jul 26, 2009
    Messages:
    1,427
    Location:
    Chesapeake Bay, Delaware Bay & S.Jersey
    Congratulations, that is great news.
  7. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    12,494
    Location:
    Fort Lauderdale
    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

    Donzi 54 Member

    Joined:
    Oct 21, 2009
    Messages:
    109
    Location:
    Point Pleasant, NJ & Morehead City, NC
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL
    Sad part is, this fine crew is not available to the rest of us. To darn far aweigh...
    :p:p:p
  11. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL
    Pre load this question and have it waiting for you when your back in range;
    Is da wifie happy?
  12. Donzi 54

    Donzi 54 Member

    Joined:
    Oct 21, 2009
    Messages:
    109
    Location:
    Point Pleasant, NJ & Morehead City, NC
    Agree. At least you can bribe them with warmth and sunshine.
  13. rtrafford

    rtrafford Senior Member

    Joined:
    Jul 13, 2019
    Messages:
    606
    Location:
    Ft Lauderdale
    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

    PacBlue Senior Member

    Joined:
    Jan 9, 2009
    Messages:
    1,941
    Location:
    Dana Point, Ca
    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

    DOCKMASTER Senior Member

    Joined:
    Feb 26, 2012
    Messages:
    493
    Location:
    Ketchikan, Alaska
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,586
    Location:
    Satsuma, FL

    Final fuel - speed - rpm values on loaded boat? Accepted by Cat? Son going to Cat school soon?
  17. chesapeake46

    chesapeake46 Senior Member

    Joined:
    Jul 26, 2009
    Messages:
    1,427
    Location:
    Chesapeake Bay, Delaware Bay & S.Jersey
    Hate to see the end of this thread because I've thoroughly enjoyed.
    Happy for you & the outcome.
    Outstanding
  18. leeky

    leeky Senior Member

    Joined:
    Jan 2, 2011
    Messages:
    182
    Location:
    Florida
    Me, too.
  19. DOCKMASTER

    DOCKMASTER Senior Member

    Joined:
    Feb 26, 2012
    Messages:
    493
    Location:
    Ketchikan, Alaska
    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

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    12,494
    Location:
    Fort Lauderdale
    Those are GREAT numbers. I'd be extremely happy with the results compared to what you had with the 12v92's.