New DIESEL outboard.

Discussion in 'Outboards' started by FAST FRED, Jun 24, 2015.

  1. FAST FRED
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    FAST FRED Senior Member

  2. Angélique
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    Angélique aka Angel (only by name)

    ‘‘GM engine’’ above link says, what cars is it in ?​
     
  3. powerabout
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    powerabout Senior Member

    smells like vapourware?
     
  4. Mr Efficiency
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    Mr Efficiency Senior Member

    Must cost an arm and a leg.
     
  5. powerabout
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    powerabout Senior Member

    my guess they are waiting for someone else to pay for the development
    No real shot of the 'slim lower unit' or how that works
     
  6. Rurudyne
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    Rurudyne Senior Member

    Considering what different companies want for regular 200 HP outboards when new....
     
  7. powerabout
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    powerabout Senior Member

    my guess is its the emission regs that cause a big issue as their are plenty of bobtail engines out there that can do the job.
    after all that you need to get the power ( all that torque) to the water
     
  8. Angélique
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    Angélique aka Angel (only by name)

    Yes, only renders and animations they come up with for now, but it explains how it's supposed to work . . .




    My belief is the small diameter pulleys, for low leg drag in the water, will cause a high drive force on the belt . . :eek:

    ‘‘ 370 Nm at 3500 rpm - - - 200 HP at 4100 rpm - - - Gear ratios 1:66 - 1:47 - 1:29 ’’

    So, estimate the diameter of that small prop shaft pulley and some calculation genius can calculate the drive force on the belt, not me . . ;)

    For example Harley can and does use larger diameter pulleys for their belt drives which generates a lower drive force on the belt . . :idea:




    [​IMG] OXE Diesel outboard - Transmission (drivetrain render at 46 sec.)




    [​IMG] OXE Diesel outboard - Modular Concept (transmission talk starts at 16 sec.)


    P.S. - Seems they have one (a prototype ?) up and running . . .


     
    Last edited: Jun 26, 2015
  9. powerabout
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    powerabout Senior Member

    lower unit looks like std outboard dimensions to me
    lets wait to see the parts on the bench
     
  10. Angélique
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    Angélique aka Angel (only by name)

    I've enlarged my above post a bit with some videos and specs and a belt force question...
     
  11. powerabout
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    powerabout Senior Member

    belts are strong a top fuel drag engine uses about 400hp to drive the blower but there isnt guide pulley on the tension side......
     
  12. Angélique
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    Angélique aka Angel (only by name)

    But they may do so with larger diameter pulleys, which lowers the drive force on the belt, I believe.
     
  13. Angélique
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    Angélique aka Angel (only by name)

    WOW, on Wikipedia they even speak about 600 HP to drive the blower on a top fuel drag engine . . .

    Top Fuel --> Superchargers:
    Found here a picture of the pulley on the blower of one...

    [​IMG]

    I don't don't know how much power above belt transfers, but the pulley sure has a larger diameter than on the prop shaft in the outboard leg, and the blower operates at much higher rpm which lowers the torque of the power transfer, which all considerably lowers the drive force on the belt. So 600 HP to drive a blower could mean there's a lower drive force on the belt than in the 200 HP outboard leg. Also durability in outboards is much more an issue than in dragstars.
     
  14. Jamie Kennedy
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    Jamie Kennedy Senior Member

    For a bottom pulley diameter of say 4 inches...

    370 N.m / 0.05 m = 7400 Newtons = 1660 pounds.

    If it is 2 inches it would be double that. Yeah that is a lot of force at maximum torque.
    Then you also have to account for the tension on the belt and the inertial forces on the belt.
    But not unreasonable, I don't think.
     

  15. Angélique
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    Angélique aka Angel (only by name)

    Hey Jamie thanks . . :)

    I wish I had thought further how to calculate force from torque . . :eek:

    Now we need to know the specs of the belt . . :cool:

    BTW, its also a lot of force on the bearings, making them wear out faster . . :(
     
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