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[QUOTE=Crazy Dazz;6367453]

The problem with diesels, as best as I can figure it, is that the combustion process is inherently poor, that the continuously variable ratio makes it both hard to run clean and combines poorly with Catalytic Convertors, and that the high initial compression lends itself to more NOx production.

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Diesels need a fuel which can lubricate the injector pump and the injectors, that means heavier viscosity fuel. Or another way of saying it, is using a fuel with larger fuel molecules, unfortunately this slows down the burn speed. Diesel is sprayed into the combustion chamber as small droplets which burn in layers from the outside towards the centre and not all is burnt thus you will get a lot of particle matter (soot).

If on the other hand you was to inject fuel in the diesel engine with some type of electronic injector that did not need to be lubricated by the fuel, the engine could then be designed to run what ever fuel you like, petrol, ethanol, what ever and it would greatly reduce emissions in the particulate matter (soot), carbon monoxide and Hydrocarbons.

But it would not solve the NOx problem.