http://auto.howstuffworks.com/diesel-two-stroke1.htmThought about this a while ago when at college. Why couldn't it work on a TDI with a different sprocket on the cam and IP, and right ecu map? Serious over-simplifying I know
I dont understand why diesel 2-strokes would be any dirtier than a normal diesel. Its not like a petrol 2 stroke which is constantly blowing out unburnt petrol into the air. In diesel 2 strokes, the fuel gets burnt and gets blown out the exhaust valves by the incoming pressurised air. Sure, a bit of clean air will go out too but thats not such a big deal.