The new 1.3 Multijet II (Euro5) diesel engine, with Start&Stop fitted as standard, is making its first appearance on the Fiat 500 and 500C models. It has a maximum power output of 95 hp (71 kW) at 4000 rpm and delivers a torque of 200 N·m (148 lb-ft) at 1,500 rpm.
Available on all trim levels, with an on-the-road list price that starts at €13,900 (US$21,000) the new power unit delivers a top speed of 180 km/h (112 mph) and accelerates from 0 to 100 km/h in 10.7 seconds with low consumption and CO2 emissions: 3.9 L/100 km (60.3 mpg US) and 104 g/km (mixed cycle), respectively.
Developed and produced by Fiat Powertrain Technologies (FPT), the 1.3 Multijet II 95 HP engine belongs to the second generation of Multijet power units.The original Multijet injector, capable of managing up to 5 consecutive injections in the same combustion cycle, was based on a hydraulic servovalve with an unbalanced shutter that required small sealing diameters and, consequently, longer strokes.
|Fiat Powertrain has a clever animation on its site demonstrating the progress in number of injections with the evolution of Multijet. Go to the animation, or click to enlarge.|
The new Multijet II injector uses a balanced hydraulic servo valve, allowing a larger sealing diameter with reduced shutter strokes. The new servovalve enables finer control of the fuel quantities injected into the combustion chamber, and can support up to 8 consecutive injections with very accurate metering.
In particular the shutter stroke is reduced to 20µm allows reducing dramatically the minimum time interval between two consecutives injection, until zero hydraulic dwell time. With these two consecutive injections it is possible to modulate the injection rate in order to achieve a better combustion process control. This new injection mode, called “Injection Rate Shaping”, results in significant benefits in terms of noise, fuel consumption and emissions reduction.
The new 95 HP engine on the Fiat 500 and 500C is equipped with a variable geometry turbocharger that ensures optimum turbocharging throughout the entire operating range. Fuel consumption has been reduced by up to 8% in the urban cycle thanks also to the Start&Stop system that switches the engine off temporarily and then restarts it.
With Euro 5 type-approval, the new 1.3 liter engine has its particulate filter (DPF) integrated in the engine compartment, improving its efficiency even more, especially in the first few moments after cold starting.
The Multijet II engines use increasingly advanced strategies to improve combustion: for example, the use of injection rate shaping (two consecutive injections with no hydraulic interval) reduces noise, fuel consumption and, in view of Euro 6, harmful emissions (a potential 30% reduction of nitrogen oxides).
The new rear torsion beam (semi-independent) suspension with an anti-roll bar is also making its debut on the Fiat 500 range. It is derived from the Abarth 500 model and has already made an appearance on the 500C. It gives better handling and a more comfortable ride.