JTD engine

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JTD is Fiat Group's term for its current common rail turbodiesel engine range. The MultiJet name is used in the second 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 Powertrain Europe group in Turin, Italy manages their interest in these engines.

1 1.3
2 1.9
3 2.4
4 References

[edit] 1.3

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 and Opel Astra). At the time of the launch this was the smallest four-cylinder Diesel engine available and has a fuel consumption of 72 mpg (3.3 L/100 km) in some applications. The engine is able to meet Euro IV pollution standards without the use of a 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 [1], but there is still no official information on any future release.

[edit] 1.9

The most common JTD engine is the 1.9 L straight-4 found in the Fiat Punto, Doblò, Stilo and Croma. It produces 80 PS (79 hp/59 kW) and reaches 36 mpg (6.6 L/100 km) in city driving. First car that used this engine was Alfa Romeo 156 in 1997 (105 PS), it was worlds first common rail diesel passenger car. In 1999 it was introduced with the Fiat Punto and Fiat Brava/Fiat Bravo/Fiat Marea. The engine block weighs approximately 125 kg. Most common model found is the 115bhp model as fitted to the Stilo.

The Multijet second generation common rail has three versions. The 8-valve version has 120 bhp and 130 bhp with variable inlet geometry; and the 16 valve version has 150 bhp, 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 is used in the Vectra, Signum, Astra, Zafira, Cadillac BLS and Suzuki SX4 as well as some Saabs marked as TiD . There are three versions of this engine, a 150 PS/320 Nm (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.^{[citation needed]} This may also spawn a V6 Diesel. Another future development is the application of variable valve timing on this engine.

[edit] 2.4

The 2.4 L straight-5 version is based on the 2.4 125bhp 5 cylinder TD engine as used in the Mk1 Fiat Marea. The JTD version benefits from the solid build of the TD block, and an improved head/injection system. There are 2 versions of the 2.4JTD, the 10-valve as used in the Fiat Marea 130JTD and the earlier Alfa Romeo 156 diesels where it was in 130bhp, 140bhp and later 150bhp versions and a 20-valve version as used in the later (2003>) Alfa Romeo 156's 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, Alfa Romeo Brera and Fiat Croma. Newest version of this engine is producing 210 PS and its used in Alfa Romeo 159 Sportwagon 2.4 JTDm Q4.