The latest generation Euro 6 TDI and BiTDI common-rail diesel engines provide excellent economy and an abundance of usable torque. Both fuel consumption and CO2 emissions have been reduced without sacrificing the driving dynamics.
Fuel needs oxygen to burn, so the engine is supplied with huge quantities of air.
Driven by the exhaust gases, it squeezes air more tightly into the cylinders. After being drawn through the turbocharger the air is then cooled by passing it through an air to air intercooler (cool air takes up less space than hot air), before entering the combustion chamber where diesel is injected directly into the cylinders at very high pressure through a nozzle. It's this intensive mixing of highly atomised fuel with the cooled compressed air that leads to better, more efficient combustion.