the 2.4 JTD Multijet 20v

The powerful 5-cylinder 129 kW (175 bhp) 2.4 JTD Multijet 20v, the second engine in the JTD multivalve family with Multijet technology. 

This brand-new unit offers various benefits. Firstly, lower noise levels as the engine warms up. The reduction ranges from 3 to 6 decibels according to rpm and environmental temperature. Then, great power (175 bhp - 129 kW at 4000 rpm + 25 bhp compared to the 2.4 JTD 10 valve) and generous torque (385 Nm - 39.3 kgm at 2000 rpm against the 305 Nm at 1800 rpm of the 2.4 JTD 10 valve). The weight/power ratio is 7.9 kgm/bhp, a figure that confirms the true sporting soul of this 2.4 JTD Multijet-powered car. Higher performance compared to the 2.4 JTD 10v with unvaried fuel consumption. Not to mention the fact that the new 2.4 JTD Multijet 20v reduces emissions even without sophisticated exhaust gas treatment devices.  

The new 20 valve unit is derived from the tried and tested 2.4 JTD 10 valve Common Rail unit and takes the form of a 5 cylinder in line unit with bore of 82 mm and stroke of 90.4 mm. The four valves per cylinder are driven directly by a twin overhead camshaft via hydraulic tappets and rocker arms. The new turbodiesel has undergone various technical improvements to increase performance and engine torque at low speeds and reduce noise and vibrations. For example, the Common Rail system used on the 2.4 JTD Multijet 20 valve unit includes two new strategies for automatically calibrating and balancing the diesel injected to lower noise and reduced vibration.  

Certain components of the engine are brand new: a cylinder head with hydraulic tappets, steel connecting rods and crankshaft, a piston with an internal channel to carry cooling oil to the main and connecting rod bearings that are made out of different material to the previous unit. The intake and exhaust manifolds are also new: the former is made out of a special high-strength material while the latter is made out of pressure cast aluminium.  

The electronic EGR and exhaust gas cooling systems are also new; the lubrication circuit features a new oil pump and an external exchanger (air/oil) for oil cooling; the cooling circuit comes with a new coolant pump. This long series of improvements and changes has culminated in a reliable, powerful engine with low fuel consumption. 
Excellent results then, achieved through a new engine control setting; an increase in direct injection pressure from 1350 to 1400 bars; and a new turbocharger setting.  
The power units are turbocharged via a Garrett turbocharger with variable geometry turbine that helps improve power delivery by allowing very high torque delivery even at low rpms. Suffice it to say that 90% of maximum torque is available between 1750 and 3500 rpm.