Diesel outboard development

Discussion in 'Outboards' started by John Perry, Feb 7, 2013.

  1. John Perry
    Joined: Nov 2003
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    John Perry Senior Member

    I don't know if this is new here, but I see that the UK MOD are funding the development of diesel outboard motors. The motivation seems to be avoiding volatile fuel in a combat situation and the logistical advantage of having the same fuel for outboards as for other engines.

    The new motors are supercharged 2 strokes having two pistons in each of four cylinders and a scotch yoke crankshaft - see http://www.coxpowertrain.com/
     
  2. CDK
    Joined: Aug 2007
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    CDK retired engineer

    Very nice to be at the receiving end of UK MOD funding.
    But all previous attempts to market diesel outboards have failed because of noise, weight and price...
     
  3. michael pierzga
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    michael pierzga Senior Member

  4. DCockey
    Joined: Oct 2009
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    DCockey Senior Member

    Sounds like there isn't a prototype yet. http://www.janes.com/products/janes/defence-security-report.aspx?ID=1065975888 http://www.upi.com/Business_News/Se...-backs-engine-development/UPI-27821359401131/ The lightweight engine is based on a supercharged, two-stroke, diesel opposed piston architecture with Scotch Yoke crankshaft and a central injector position.

    Achates Power is also developing an opposed piston Diesel engine, this one with funding by US DoD. http://www.achatespower.com/
    http://www.greencarcongress.com/2013/02/achates-20130204.html

    It will be interesting to see if either of these engines goes into volume production.
     
  5. WestVanHan
    Joined: Aug 2009
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    WestVanHan Not a Senior Member

    I looked briefly for an internal drawing-could not find one.

    Anyways I see no reason for a scotch yoke-makes no sense IMO. And with opposed pistons you need 2 cranks anyways,or one crank and control rods for the opposite piston.

    If anything they should emulate the old Commer TS3 engines-single crank and rocker arms.
    IIRC over 100lbft and 40 hp per litre,for truck use-not souped up boat engines.
    I have an OP engine,and it's not a Commer...

    A diesel outboard would be great and maybe a good seller-however getting it into the markets would be so pricey.
     
  6. DCockey
    Joined: Oct 2009
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    DCockey Senior Member

    EcoMotors is also developing an opposed piston engine which has two pistons per cylinder and cylinders on either side of the crank. I don't see anything indicating spark ingnition or Diesel. Cutaway view is available at http://www.ecomotors.com/technology
     
  7. WestVanHan
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    WestVanHan Not a Senior Member

    It's diesel.

    I know this from before,and if you look at the pistons you can see a molded cutout so the fuel can be squirted right to the center of the pistons at TDC.

    Interesting engine

    http://en.wikipedia.org/wiki/Napier_Deltic
     

  8. brian eiland
    Joined: Jun 2002
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    brian eiland Senior Member

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