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post #5 of (permalink) Old 2nd May 2006
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I think the smoke is just down to incomplete combustion when you're injecting large amounts of fuel.

The Euro IV emissions standard pretty much eliminates smoke production by diesel engines. From what I can see, manufacturers appear to be achieving this in one of two ways:
1) Restricting the engine to produce only about 80% of it's potential peak power.
2) Fitting a particle filter to trap the soot.

According to this Wiki article, particle filters are going to be mandatory on diesel engined vehicles in the EU from 2007. Whether or not this will be the case for cars that can meet Euro IV without a filter remains to be seen. Common sense says it shouldn't be, but then they insisted on making catalytic converters mandatory on petrol engined cars, even though lean burn technology (which isn't compatible with the cat) might have proved to be more effective in reducing overall polution.
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