Instantaneous tuning of the engine fueling is an important part of the its efficient design, especially when combined with the latest in clean-diesel technologies. The diesel uses an intake throttle to deliver precise amounts of air and EGR into the cylinders. Exhaust is then sent into an oxidation catalyst before traveling through a diesel particulate filter (DPF) to trap soot and convert nitrogen oxides to pure nitrogen. Post-combustion injections provided by the advanced injectors should ensure the DPF system is always working at maximum efficiency.
GM will only be offering the 2.9L turbodiesel in the European CTS-for now. We can't blame Cadillac for being cautious about offering a diesel in a Cadillac, but this setup looks very promising for the North American market. The VMM engine is just 50 hp shy of the best direct-injection gas V-6 available for the CTS, and it makes almost as much torque as the LS2 V-8 engine sold in the limited-edition CTS-V. Add in that the diesel will get better mileage, be just as clean (or cleaner), and be as smooth and quiet as the gas engines, and it seems like a no-brainer to guess this engine will soon be coming to a Caddy dealer near you.
Manufacturer: VM Motori in Cento, Italy
Displacement: 2,935 cc/179 ci
Configuration: 60-degree V-6
Bore x stroke: 3.268 x 3.559 inches
Block material: Compacted graphite iron
Head material: Cast aluminum
Engine weight: 530 pounds (approximately)
Valvetrain: DOHC 24 valves
Turbo: Variable-geometry
Fuel pump: Bosch CP3
vFuel delivery: Bosch common-rail (29,000 psi)
Fuel injectors: Piezo-electric (up to 8 injections per cycle)
Emissions: Piezo-electric cylinder-pressure sensors, cooled EGR, oxidation catalyst, and DPF
Horsepower: 250 hp at 4,000 rpm
Torque: 406 lb-ft at 2,000 rpm