Jet-Fighter7700
Honorary Master
what I heard about Diesel engines is due to the fuel combusting with pressure and not a spark, the block needs to be made a lot thicker to withstand years of heavy operation, and why Diesel has always been used in applications requiring reliability and not much speed, for instance a Truck engine or a Generator or a Marine engine,There has always been a stigma around diesels being for 'commercial' and not passenger use. That started to change with the MkIV Golf platform using the VE110 1.9 TDi engine which was quieter, more efficient and drove better than the older diesel engines. I don't think diesel engines cost that much more to produce than similar petrol engines, some parts like the block, crank, conrods, etc. need to be 'beefier' due to higher low end torque but they don't need to be designed to handle high loads at high rpm.
As for biodiesel, there is a lot of it overseas in North America and Europe, not so much in Africa unless you have the means to make it yourself. Having said that, it isn't the bee's knee's it is made out to be, sure it is made from sustainable crops but it takes a massive amount of land to make it.
maybe I'm wrong in thinking that, but then why add the complexity of a turbo in the first place? unless they add turbos to made it usable in a passenger vehicle, as without a turbo its simply not usable for a small vehicle.