Gasoline diesel engines

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There are two possible scenarios.
One would be using diesel in a spark ignition engine.
This is common in parts of the world where diesel is more readily available than gasoline, like Cuba.
You start the engine on gasoline and then switch to diesel after it warms up. This works with old, low compression engines.
It might not work as well with more modern engines, since diesel has very low octane.
The second possibility would be a compression ignition engine using gasoline as a fuel. This has been tried as well and there is some serious work going on to evaluate such designs for production.
Of which were you thinking?
 
About 20 years ago a neighbor had a large antique Farmall that started on gasoline and ran on diesel. Had two levers that had to be moved at the same time to switch it over. If I understand right one of the levers closed off auxiliary combustion chambers with poppet valves increasing compression and shutting off vacuum flow through the carburetor. The other lever apparently started the direct injection of the diesel fuel.

One time he went by the house being towed. Every time he tried to start it, it veered for the ditch. He had mistakenly hooked the power steering hoses up backwards, and the electric starter didn't have enough force to turn the motor that way.
 
In David's Farm, he operates an engine that can use gasoline and diesel fuel.
http://www.youtube.com/watch?v=Y81EUqzvbWc

Unfortunately, it appears that it can't be run at full power on gasoline.

The idea was that the compression could be lowered in gasoline mode, and that would make the starter do less work. Also, gasoline engines from back then would fire up more quickly than diesels.
 
There's a few diesel gas conversions around Oz...about 30% of the fuel is propane or NG...conversions run at 3-4 grand.

But there's ALSO one (or more) companies that inject gasoline at below the combustible limit into the intake and augment the diesel process.
 
Maybe multifuel would have been a better title. A military multifuel engine will run on gasoline, diesel, and JP4 or what ever they use now. Oh and it has no spark plugs.
 
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