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BIG Outboard Engine by 7 Marine

Discussion in 'Technical Discussion' started by brian eiland, Mar 31, 2011.

  1. brian eiland, Mar 31, 2011
    #1
    brian eiland

    brian eiland Senior Member

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    This reports on the new Seven Marine 557hp Outboard.
    http://www.boats.com/blog/2011/02/seven-marine-reveals-557-hp-outboard-at-miami-boat-show/

    This picture shows their "Propriety transfer case" which many are assuming to be a belt or chain. If its a belt, that is one heck of a belt.
    [​IMG]
    Does anyone have any details??

    Eric Davis was asked how the engine’s power made the 90-degree change in direction to mate to a drive shaft, and he just shrugged and smiled. “I’ll have to explain that to you later,” he said. Apparently the Seven team is not ready to reveal all of its secrets.

    We do know that shifting is accomplished above the gearcase. The gearcase has a four-inch-diameter tube – a standard size – but has twin pinion gears to transfer power from the vertical drive shaft to the horizontal prop shaft, while keeping the size of the case small and hydrodynamic. An integral power steering system was developed with the input of Latham Marine, and the motor will be rigged with custom Hering propellers.

    Attached Files:

  2. K1W1, Mar 31, 2011
    #2
    K1W1

    K1W1 Senior Member

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    Hi,

    Given by what looks like the ass end of the engine and it's associated casings we can assume it has a big rubber belt driving a horizontal shaft to a bevel gear or two.

    The bottom end being fairly standard.

    The top end drive will be not unlike a differential but it wont need spider gears ( or by the time it does that is the least of your worries)
  3. brian eiland, Mar 31, 2011
    #3
    brian eiland

    brian eiland Senior Member

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    I'm betting it's a 'silent chain' belt like they used in an early Olds Tornado front wheel drive car to mate the engine-transmission
  4. YachtForums, Mar 31, 2011
    #4
    YachtForums

    YachtForums Administrator

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    ZF is manufacturing the transmission and the lower unit is a twin-pin proprietary design. The most amazing aspect of this new outboard is the audacity of the manufacturer to ask $75k per motor. Good luck!
  5. SHAZAM, Mar 31, 2011
    #5
    SHAZAM

    SHAZAM Senior Member

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    I can't comprehend this. I've always believed that big boats need to be inboards rather than having to have three or four monster outboards. Is there anyone here that would rather have two of these on their boat rather than a pair of modern four cycle common rail diesels?
  6. Capt J, Mar 31, 2011
    #6
    Capt J

    Capt J Senior Member

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    The motor is based off of the chevy I think it was 8.1. I'm willing to bet it has a large Cog belt, like the superchargers they use on raceboats do. I too cannot comprehend the use of outboards of this size. However, at the miami show Intrepid had a boat there with 3 or 4 of them on it, and they seem to not know how to design a boat with inboards because even on a 46' they stuff 4 engines on it.
  7. Old Phart, Mar 31, 2011
    #7
    Old Phart

    Old Phart Senior Member

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    I dunno
    Wonder if it is supplied with a pull cord, in case of a dead battery?! :D
  8. 805gregg, Mar 31, 2011
    #8
    805gregg

    805gregg New Member

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    Looks a lot better in a Caddy.
  9. Marmot, Apr 1, 2011
    #9
    Marmot

    Marmot Senior Member

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    I don't think it has anything at all to do with propulsion or engineering.