Performance Diesel Engine Swap.
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Performance Diesel Engine Swap.

  1. #1
    PIn It To Win It!!!
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    Default Performance Diesel Engine Swap.

    Has anybody used a Duramax, Cummins or Powerstroke in there boat? or anybodies thoughts on the idea?

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    SDBA #819 vdrivegrimes's Avatar
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    Diesel power is for yachts. They are heavy and dont spin high rpm

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    my boat would probably sink...

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    Senior Member JakeC.'s Avatar
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    I know there was a gn race boat that had a duramax in it a couple of years back.

  7. #5
    SDBA #819 vdrivegrimes's Avatar
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    A dmax would prob be the only one that could last spinning at high rpms. Its probably the lightest of the three.

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    Senior Member STV_Keith's Avatar
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    There is a GN boat that runs a modded Dmax diesel. I saw it run at Puddingstone this year. They usually run it in the Parker 300 Enduro too.

    I believe they called me years ago, before they built the boat, for some insight as I used to work at a diesel performance shop (in a former life LOL).

    My suggestion was and is to run a 12v Cummins. All you need is a fuel source and 12v and it will run. There are sled pullers running them over 6k rpm, but that takes big money for parts. With an OD gear box, like a Lenco OD or possibly a V-drive with the right gears, it can be done. Pretty easy to make 800hp/1600ft-lbs on diesel these days, and if you really wanted to push it and spend the money, you could easily double that.
    Keith-


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    Super Moderator HammerDown's Avatar
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    In my location Diesel fuel is +.50 higher then Premium gas, filling my truck is painful enough
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member steveo143's Avatar
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    3 or 4 years ago Imco had a twin turboed Duramax that they put together at the LA Boat Show. Don't know what ever became of it.
    steveo143 AKA DiMarco 21 II



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  11. #9
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    Quote Originally Posted by STV_Keith View Post
    There is a GN boat that runs a modded Dmax diesel. I saw it run at Puddingstone this year. They usually run it in the Parker 300 Enduro too.

    I believe they called me years ago, before they built the boat, for some insight as I used to work at a diesel performance shop (in a former life LOL).

    My suggestion was and is to run a 12v Cummins. All you need is a fuel source and 12v and it will run. There are sled pullers running them over 6k rpm, but that takes big money for parts. With an OD gear box, like a Lenco OD or possibly a V-drive with the right gears, it can be done. Pretty easy to make 800hp/1600ft-lbs on diesel these days, and if you really wanted to push it and spend the money, you could easily double that.
    Thanks for the replies! I have done a little homework on this idea but still want to here more thoughts. Here is my thought. Turbo Diesel engine, 2 Lenco trans w/reverse (shift & hp capability), Imco drive (reverse removed), match gearing and prop for the this application installed in a 25'-28' v-hull. The goal would be reliabilty, good towing at low speeds (10-30mph), good fuel economy at cruising (40-60mph) but you could still hit some good top speeds (70-80mph). Maybe it sounds a bit crazy but does sound feezable.

  12. #10
    Senior Member STV_Keith's Avatar
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    Man, a TH-400 would would great for you, but you don't have the room if you're gonna run an outdrive. V-drive would be a no-brainer as Cummins makes adapter plates to TH-400/Powerglide, and while those are non-lockup trannys, you could build a lockup converter and input shaft for one like a 4L80e.

    Lenco drives are meant for race cars...it won't shift smooth like a truck trans will, and won't like decerating in anything other than high gear. Not sure you'd want to run it around in 1st. Reverser, no brainer, but Lenco stuff is way expensive compared to a trans style setup.

    Maybe rather than do a trans/lenco, just use the drive to shift as intended. All you will really needs is an OD box to step up the RPM from diesel speeds to gas engine speeds. You could use a Lenco OD box for this, as it's one gear all the time. Lots of ratios available. Probably want the 1.68:1 for this application, with a 1.35 or 1.50 in the drive.
    Keith-


  13. #11
    Senior Member steveo143's Avatar
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    You could use a Z drive also with an abundance of gear ratios to choose from, mounted between engine and drive.
    steveo143 AKA DiMarco 21 II



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    Senior Member Reservoir Dog's Avatar
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    if you can find one GTH use to make a over/under box (changeable gears, i think they were casale) for the top fuel jets.

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