The BIG ? IDI VS DI. Answer for Everyone Short and Sweet.
 

Some more Reading if you like. But the rest of the information is mainly about evolution of the Diesel. Banks Power | Diesel Evolution

Direct injection diesels are as much as 15 percent more efficient than IDI diesels in terms of thermal efficiency. Power and torque output is up to 40 percent better with DI. Additionally, fuel consumption is up to 30 percent less, and that means carbon dioxide and hydrocarbon emissions are reduced by a similar amount. The transition of the burning gases from the precombustion chamber to the cylinder in IDI diesels results in significant heat losses into the cylinder head and cylinder walls, which reduces efficiency.



I just wished to add then when I run across some information I Think ( of which I could be wrong ) people can use I throw it up. If by posting this informative information is wrong or distracting please let me know and I will cease doing so?