Stellantis e-Hybrid 1.5: models equipped with this hybrid engine and its characteristics

Global Small Engines. The turbocharger that forms the basis of the new e-Hybrid is a four-cylinder Gse, an acronym for Global Small Engine. This family of engines, also known as FireFly, was designed to replace the Fire and TwinAir engines (the two-cylinder Sge, Small Gasoline Engine) in the world: born in 2016, it made its debut in Brazil in two displacement variants. – 72 hp 1.0 N3 and 101 hp 1.3 N4, both naturally aspirated – on models like the Fiat Uno, Mobi and, later, the Argo. Versions for South America can also run on ethanol and feature indirect fuel injection, a single overhead camshaft with variable valve timing and two valves per cylinder. For the European market, the two four-cylinders with aluminum crankcases have been updated in terms of the cylinder head and other details: the T3 with 999 cc (120 hp) and the T4 with 1,332 cc (150 or 180 hp) arrived in 2018 are characterized by supercharging. by turbine, direct injection and MutliAir 2 distribution with four valves per cylinder. These units formed the basis of the first hybrid models of the brands Fiat (the three-cylinder 1.0, aspirated version of 70 hp debuted on the Panda and the 500 Hybrid) and Jeep (with the 4xe versions driven by the 1.3 turbo).

The (new) thermal Gse. The four-cylinder around which the new hybrid architecture has been developed has an increased displacement: the 1.5 Gse T4 Turbo e-Hybrid has a bore of 71.2 mm and a stroke of 92.2 mm for a total of 1,469 cubic centimeters. Also in this case the base is in aluminum (shared with the T4) and the distribution is the MultiAir, while the high pressure direct injection system (350 bar) is new and the high turbulence intake ducts have been redesigned. . The millecinque operates a Miller operating cycle (therefore with a compression phase shorter than the expansion phase, to increase the energy resulting from the pressure generated by the combustion, ed), for a compression ratio of 12.5:1 (1.3 reaches 10.5:1). The maximum power is the same as that of the 1.3 of 130 hp, but it is delivered higher (5,500 rpm instead of 4,750), while the torque drops to 240 Nm at 1,500 rpm (the small “brother” reaches 270 Nm at 1,560 rpm). The thermal power and torque are the same as for the entire hybrid powertrain: the electric part, in fact, intervenes mainly at low revs, without modifying the maximum values ​​measured.

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