Donzi Gt21 Jetdrive
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Donzi Gt21 Jetdrive

  1. #1
    Junior Member axelkloehn's Avatar
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    Default Donzi Gt21 Jetdrive

    Hi folks, I am new to this board. A big hello to you guys from good ol' germany.

    I bought a Donzi GT21 which was originally equipped with a Jet-drive as you can see from the cutouts. I suspect it was a olds/berkeley package, maybe 350 or 455 Olds.
    There is no hull # anymore because the cockpit area was cut away (someone wanted to make it a family boat ).

    I reglassed the transom and other things, put the cockpit area together again and now it is ready for a new engine and drive.
    I bought a 455 Hardin/Olds with mondello heads and a Jacuzzi WJ from a jetboat for a good price and want to put it in.

    Will that be a good package for the boat? The Donzi is quiet heavy!? I am not sure whether I stay with the original jet-package or line it up a Bravo 1 Sterndrive, which is lying around with all rigging in my garage.... It is than a bit tricky with coupler/waterpump etc. but not impossible.

    What performance will it have with the jet compared to sterndrive? You guys have definately more experience than I have...does anyone know??



    Thank you for your advice, Axel
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    Last edited by axelkloehn; 09-21-2009 at 06:08 AM.

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  3. #2
    Junior Member axelkloehn's Avatar
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    Here is the Olds and the Jacuzzi:
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    Last edited by axelkloehn; 09-21-2009 at 05:30 AM.

  4. #3
    Boss of the McIntyre Mob danhercules's Avatar
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    Guten Tag!!

    Where in Germany? My folks are from Munich.


    The Olds and Jacuzzi is gonna be a fairly easy install. I would not expect much performance out of them. They will get you around and you will have a great time. If that is all you want, I would say go for it. If your looking for performance, then you might want to rethink power and drive.

    Prost!!


    Very first TPR 21' Deck. 528 BBF 736hp on pump gas built by High Flow Dynamics

    McIntyre Mob. Where the rejects play!

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  6. #4
    Junior Member axelkloehn's Avatar
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    Quote Originally Posted by danhercules View Post
    Guten Tag!!

    Where in Germany? My folks are from Munich.


    The Olds and Jacuzzi is gonna be a fairly easy install. I would not expect much performance out of them. They will get you around and you will have a great time. If that is all you want, I would say go for it. If your looking for performance, then you might want to rethink power and drive.

    Prost!!
    Well, I want to go around 65-70 mph, a bit more than the rest of the pack .

    Is that realistic with that package?

    I live in Hamburg/north of germany which is about 550mls from Munich.

    Cheers, Axel

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    Senior Member DuaneHTP's Avatar
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    Well, I want to go around 65-70 mph,
    Possible, but not probable. That particular Donzie hull was built for a stern drive installation and will perform better that way. It's really tool heavy for the Olds/Berk package. Demamding that much form the Olds will make it a short lived engine. I'd go with the stern drive in that one, (and I'm a jet nut).
    Duane HTP

  8. #6
    Senior Member jetboatperformance's Avatar
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    Axle Good Morning and welcome , I'd Agree with Duane here , not going to tell you it can't be done but 65-70 is a lofty goal with the Olds package in a boat that large we've done just about every "swap" you can Imagine and That boat unfortunaley would take some serious HP with a jet to make 65 IMO Tom

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    Classic Hotboater! GasGuzzler's Avatar
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    I would take Duanes and Toms advice. Go with the stern drive and save the jet for something smaller and lighter down the road.

  10. #8
    Junior Member axelkloehn's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Axle Good Morning and welcome , I'd Agree with Duane here , not going to tell you it can't be done but 65-70 is a lofty goal with the Olds package in a boat that large we've done just about every "swap" you can Imagine and That boat unfortunaley would take some serious HP with a jet to make 65 IMO Tom
    Hmmmh, I expected something like this.

    It looks like the Jacuzzi in line with the 455 Olds is too long anyway. My engine room is something like 50" long, the Jacuzzi has more than 20" from the transom and the engine 32". That tells me it does not fit!!

    Did somebody ever hooked up the 455 Olds engine with a Bravo One sterndrive?? What's with bellhousing and coupler? Power and torque should be ok from the 455 Olds for the Bravo, shouldn't it? I have been told it is 450hp...
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  11. #9
    Senior Member DuaneHTP's Avatar
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    You are on a jet forum here. To find the answers on the interchangeability of motors on that out/drive, I'd suggest you go to an I/O forum. I don't think it can be made to fit without a lot of engineering and trouble though.

  12. #10
    Senior Member Delemorte's Avatar
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    ever thought of ditching that hull and finding a smaller lighter one for the power plant you already have? May be cheaper than trying to retrofit that power plant to a out drive. Not sure how many hulls like that in Europe though so that may not be possible.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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