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Old 18 October 2013, 17:07   #11
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Interesting proposal from Cox - a 4 cylinder 8 piston(!) 2 stroke diesel

Diesel Engine Manufacturers | Small Diesel Engines | Diesel Engines
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Old 18 October 2013, 17:29   #12
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Originally Posted by willk View Post
Lot of talk in that link about a "scotch yoke".

Does that come from scotch eggs?
No it's distilled from Scotch mist...

http://www.mekanizmalar.com/scotch_yoke.swf
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Old 18 October 2013, 17:46   #13
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Interesting proposal from Cox - a 4 cylinder 8 piston(!) 2 stroke diesel

Diesel Engine Manufacturers | Small Diesel Engines | Diesel Engines
Nothing particularly new there- The Rootes TS3 was built 50+ years ago.

Worth a revisit though.
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Old 19 October 2013, 04:06   #14
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Good thread this, some interesting innovations.

Barrus developed a 50hp outboard in 2004 for the MOD that ran on various NATO fuels:

http://www.ibinews.com/ibinews/newsd...33ibinews.html

Not sure how successful it has been or what the various grades of fuel are..

These sort of specialist products only tend to be available for military/rescue applications as they do not have to meet the same stringent emissions as products that are available for general sale.
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Old 22 October 2013, 15:26   #15
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Good thread this, some interesting innovations.

Barrus developed a 50hp outboard in 2004 for the MOD that ran on various NATO fuels:

Barrus develops "world's first" production direct fuel injected 50hp outboard engine

Not sure how successful it has been or what the various grades of fuel are..

These sort of specialist products only tend to be available for military/rescue applications as they do not have to meet the same stringent emissions as products that are available for general sale.
Ha ha that was my project for 5 long years!!
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Old 24 June 2014, 08:11   #16
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Hi, question for turbo diesel. Have u a set off twin engines forsale
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Old 24 June 2014, 08:43   #17
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I guess there may be an official secrets act thing mixed into the contract for that job!



Theory of making it work isn't so different to the way cars these days will run on 95 or 98 octane without you taking it to the dealer to recalibrate.

With fuel injection you just need to write as robust algorithm for your engine management box that will slowly advance the spark until it detects knock (but do that in real time) - and alter the injection moment to account for the differnet burn speeds of the fuel by using the exhaust sensors.

Simples!



I once ran an 2- stroke Merc 15 on diesel - having been handed the wrong portable tank mid event one Saturday. (Thankfully the displacement tub didn't need refuelld as early as I did!)
It was a challenge to start, but once going it did a good impersonation of a 2Hp (and smoked like a lum) - but it ran!
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Old 24 June 2014, 14:52   #18
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Pretty much it, but a bit more than that. One big problem is you can't get a exhaust probe that works in water so you cannot get the probe to change any calibrations.
On an outboard the exhaust is under water so that is a problem. There are also quite a few mechanical changes to the engine such as compression ratio changes and extra oil needed to stop the piston rings getting jacked out with carbon deposits. It's really not easy to do! Also the engine ideally still needs to meet emission legislation which on the optimax based engine involves changing the air injection timing as well as fuel injection. We also run with different direct injectors that have more control and a different spray pattern. It's a huge minefield!!!!
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Old 25 June 2014, 13:21   #19
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Hi Robby ,dont that make you feel old ha ha . How is the wife/family and yourself?
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