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Thread: Cavitation problems

  1. #1
    Join Date
    Aug 2012
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    Cavitation problems

    Hi, I am new to the wonderful world of Donzi and am struggling to get my ZX 28 up on the plane and wondered if I was missing a trick. She's got 2 x 260 HP Mercruisers but has to be eased gently on the plane then she's off to 60mph without a problem. Any clues?

  2. #2
    Join Date
    Mar 2000
    Rep Power
    Most of the step bottom boats do this. My understanding is that the hulls will suck air through the steps if you try to accelerate hard from a standstill. All the ZX's I've been in had to be walked up mildly then you could get on it. Some say you need to have the tabs down to get up on plane. It helps but I don't think it's necessary.

  3. #3
    Join Date
    Mar 2000
    Rep Power
    This is a propeller problem.
    You don't say what kind of props you have.
    If your props are ventilated, (holes behind the blades) and you have thru-prop exhaust, put caps in them.
    If you have 3 blade props, think about going to 4 blade.
    Formerly of Melbourne, Florida
    Permanent Resident of St. Petersburg, Florida
    1966 Classic 18-2+3

  4. #4
    Join Date
    Dec 2007
    Rep Power
    There's a whole thread about this (maybe more than one). Did some searching and found this one:
    "I don't have time to get into it, but he went through a lot." -Pulp Fiction

  5. #5
    Join Date
    Jul 2002
    Rep Power
    1. go with less pitch props
    2. more dia with less pitch
    3. write down ALL finding getting on plane rpm etc, start with the wheels you have now
    4. then tell us. problem probably will go away

  6. #6
    Join Date
    May 2007
    Rep Power
    I had great success with the Revoution 4 prop I ended up using on my 25' Martini before selling the boat. They really grab and run better than the other ones I tried including a Bravo, Mirage, and cleaver. I know all boats are different, but it might be worth trying a set. Bill

    1971 Donzi 18' 2+3
    1985 Eliminator 23' Daytona Offshore - Kevlar hull
    1988 23' Donzi CC F-23 with 250HP EFI Mercury OB
    1989 28' Team Warlock Offshore - single 548CID/600HP
    1990 23' Warlock Offshore - single 525HP
    Bill from Denison, TX - Lake Texoma

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