Fiat JTD engine

Multijet is a Fiat and General Motors joint venture, established in 1996, in manufacturing diesel engines with turbo and common rail direct injection technology.

Ownership of some Fiat Multijet designs is shared with General Motors as part of a settlement of the failed merger between the two auto conglomerates.

Some PSA Peugeot Citroën diesel engines are also rebadged JTD units, and vice versa.

Compared to the first-generation JTD engines (Unijet system), which only featured a smaller pilot and a larger main injection, Multijet is capable of up to five injections per combustion cycle which enables better, more efficient cold running, better performance especially in the lower rev-range, quieter operation, as well as even lower consumption and emissions.

This enables even mid-sized sedans like the Alfa Romeo 156 and Lancia Lybra equipped with the 1.9L JTD to achieve fuel economy upwards of 45 mpgUS (55 mpgimp or 5L/100 km) on country roads and highways while offering an equal amount of torque as the 3.0L 24V V6 engine.

[3] This results in an engine that is quiet and has a smoother operation, lower emissions, better fuel mileage and higher performance compared to the previous generation.

At the time of the launch this was the smallest four-cylinder diesel engine available and it had a fuel consumption of 3.3 L/100 km (86 mpg‑imp; 71 mpg‑US) in some applications.

[11] In January 2008, Tata Motors introduced the new Indica Vista model, which features a new Quadrajet branded version of this engine.

[15] In January 2020, the production of the 1.3 Multijet ended in India in both the Maruti Suzuki plant and the Fiat-Tata JV, as the BS6 emission regulations came into effect in the country from 1 April 2020.

The engine block weighs approximately 125 kg (276 lb), the cylinder head features an overhead camshaft with directly actuated valves.

Their CDTI engine, manufactured in Pratola Serra, Italy and Kaiserslautern, Germany, is the product of the half-decade joint venture between GM and Fiat.

It is used in the Vectra, Signum, Astra, Zafira, Cadillac BLS and Suzuki SX4 as well as some Saabs marked as TiD and TTiD (twinturbo version).

Fiat Powertrain Technologies released information about a new two stage turbo (twin turbo) version of this engine in summer 2007, which is available with two power levels, one producing 180 PS (132 kW; 178 hp) and one 190 PS (140 kW; 187 hp), both with a maximum torque output of 400 N⋅m (295 lb⋅ft) at 2000 rpm.

Announced in 2023, a new version of the 2.2 Multijet Evo (2,184 cc) four-cylinder engine (code B.B2) entered production in 2024 and was Euro 7 approved in 2025.

[32] The 2.4 L (2,387 cc) straight-5 version is based on the 2.4 124 PS (91 kW; 122 hp) 5 cylinder TD engine as used in the Mk1 Fiat Marea and the Mk1 Lancia Kappa.

It was designed for transverse front-wheel drive use and was deemed too long and tall for widespread use in other GM Ecotec or Fiat products.

The latest version of this engine produces 210 PS (154 kW; 207 hp) and 400 N⋅m (295 lb⋅ft) at 1500 rpm, and is used in Alfa Romeo vehicles.

[33] Evolution of VM Motori A 428 DOHC in the inline-4 engine with 1,800 bar (26,000 psi) common rail injection system and piezoelectric injectors A 3.0 L; 182.3 cu in (2,987 cc) double overhead camshaft V6 engine, featuring four valves-per-cylinder and common-rail direct fuel injection.