JTD is Fiat's term for its common rail turbocharged diesel engines. The MultiJet name is used, in the 2nd generation common rail units. Most of the Fiat, Alfa Romeo and Lancia range has JTD engines. Ownership of the Fiat JTD design is shared with General Motors as part of a settlement of the failed merger between the two auto conglomerates. GM's Powertrain Europe group in Turin, Italy manages their interest in these engines.
A small 1.3 L (1248 cc) version (called the SDE) is produced in Bielsko-Biala, Poland. The Multijet 70hp version was chosen in 2005 as the "Engine of the Year".
There are two versions of this engine: a 70 PS (69 hp/51 kW) (used in the Fiat Punto, Panda, Palio / Albea, Opel Corsa / Combo and Suzuki Swift) and a variable inlet geometry 90 PS (89 hp/66 kW) (used in the new Fiat Grande Punto). At the time of the launch this was the smallest 4 cylinder Diesel engine available and is capable of remarkable fuel economy: 72 mpg (3.3 L/100 km) in some applications. The engine is able to meet Euro IV pollution standards without the use of an additional Diesel Particulate Filter.
A 1.6 L version of the engine, with a maximum power output of 120 PS (118 hp/88 kW) was announced for 2006 ( 1112.html) , but there is still no official information on any future release.
The most common JTD engine is the 1.9 L straight-4 found in the Fiat Punto , Fiat Stilo and Fiat Croma. It is a common-rail direct-injection turbocharged engine which produces 80 PS (79 hp/59 kW) and reaches 36 mpg (6.6 L/100 km) in city driving. The engine was introduced in 1999 with the Fiat Punto and Fiat Brava/Fiat Bravo/Fiat Marea. The engine block weighs approximately 125g. Most common model found is the 115bhp model as fitted to the Stilo.
The Multijet 2nd generation common rail has 3 versions: 8 and 16 valves. The 8 valve version has 120bhp and 130bhp with variable inlet geometry; and the 16 valve version has 150bhp, that can be found on the Croma.
Opel also uses a version of this engine. 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 will be used in the Opel Vectra, Opel Signum, Opel Astra, Opel Zafira, as well as some Saabs. There will be three versions of this engine eventually: A 150 PS (148 hp/110 kW), 120 PS (118 hp/88 kW), and 100 PS (99 hp/74 kW).
Engineers are reportedly working on creating a V8 engine by mating two of these 1.9 L I4s at a common crankshaft. This may also spawn a V6 Diesel. Another future development is the application of variable valve timing on this engine.
The 2.4 L straight-5 version is used in the Alfa Romeo 156 as well as some Lancia vehicles. It was designed for transverse front-wheel drive use and was deemed too long and tall for widespread use in other GM or Fiat products. The multijet variant of this engine, capable for 200 PS (197 hp/147 kW), is currently used in the Alfa Romeo 159 and Fiat Croma.