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JTD

JTD/MultiJet engine
Overview
Manufacturer
Also called Family B engine
Production 1997–present
Combustion chamber
Cylinder block alloy Cast iron
Cylinder head alloy Aluminium alloy
Combustion
Fuel type Diesel
Oil system Wet sump
Cooling system Water cooled
0.8 L
Overview
Manufacturer Maruti Suzuki
Also called DDiS 125
Production 2015-present
Combustion chamber
Configuration I2
Displacement 793 cc (48.4 cu in)
Output
Power output 34 kW; 47 PS (46 bhp)
Torque output 125 newton metres (92 lb·ft)
1.0 L
Overview
Manufacturer General Motors
Also called
  • XSDE (Xtra Smart Diesel Engine)
  • Smartech Diesel
Production 2011–present
Combustion chamber
Configuration I3
Displacement 936 cc (57.1 cu in)
Cylinder bore 69.615 mm (2.74 in)
Piston stroke 82.0 mm (3.23 in)
Valvetrain DOHC with roller finger followers
Compression ratio 16.8:1
Combustion
Fuel system Common rail
Output
Power output 43 kW; 57 hp (57 bhp)
Torque output 150 N·m (111 lb·ft)
Dimensions
Length 553.3 mm (21.78 in)
Width 547.3 mm (21.55 in)
Height 700.5 mm (27.58 in)
Dry weight 130 kg (287 lb)
1.3 L
Overview
Manufacturer Fiat/General Motors
Also called
Production 2003–present
Combustion chamber
Configuration I4
Displacement 1,248 cc (76.2 cu in)
Cylinder bore 69.6 mm (2.74 in)
Piston stroke 82.0 mm (3.23 in)
Valvetrain Dual overhead camshafts
Compression ratio 17.6:1
Dimensions
Dry weight 140 kg (310 lb)
1.6 L
Overview
Also called Multijet (Fiat)
Production 2006–present
Combustion chamber
Configuration I4
Displacement 1,598 cc (97.5 cu in)
Cylinder bore 79.5 mm (3.13 in)
Piston stroke 80.5 mm (3.17 in)
1.9 L
Alfa Romeo JTDm 159.jpg
JTDm engine cover of Alfa Romeo 159
Overview
Manufacturer Fiat/GM
Also called
Production 1997–present
Combustion chamber
Configuration I4
Displacement 1,910 cc (117 cu in)
Cylinder bore 82 mm (3.2 in)
Piston stroke 90.4 mm (3.56 in)
Compression ratio 18.5
Dimensions
Dry weight 125 kg (276 lb) (Single Turbo)
2.0 L
Alfa Romeo JTDm-2 giulietta.jpg
JTDm 2 engine cover of Alfa Romeo Giulietta
Overview
Manufacturer
Also called
  • CDTI (Opel)
  • TiD4 or TTiD4 (Saab)
  • GM Family B engine (GM)
  • Multijet (Fiat)
Production 2008–present
Combustion chamber
Configuration I4
Displacement 1,956 cc (119.4 cu in)
Cylinder bore 83 mm (3.3 in)
Piston stroke 90.4 mm (3.56 in)
Cylinder block alloy Cast iron
Cylinder head alloy Aluminum
Valvetrain Dual overhead camshafts
Compression ratio 16.5
Combustion
Fuel system Direct injection
Fuel type
Oil system Wet sump
Cooling system Water-cooled
Output
Power output 110–192 hp (82–143 kW)
Torque output 192–280 lb·ft (260–380 N·m)
Dimensions
Dry weight 174–182 kg (384–401 lb)
2.2 L
Overview
Manufacturer Fiat (Pratola Serra plant)
Also called
  • Multijet II (Fiat)
Production 2015-current
Combustion chamber
Configuration I4
Displacement 2,184 cc (133.3 cu in)
Cylinder bore 83.8 mm (3.30 in)
Piston stroke 99 mm (3.9 in)
Cylinder block alloy Cast iron
Cylinder head alloy Aluminum
Valvetrain Dual overhead camshafts
Compression ratio 15.5:1
Combustion
Turbocharger Variable-geometry integrated in the exhaust manifold
Fuel system Common Rail
Management Multijet II (Magneti Marelli)
Output
Power output 185–210 PS (136–154 kW; 182–207 hp)
Torque output 440 N·m (320 lb·ft)
2.4 L
Alfa0038 JTD.jpg
Engine cover of Alfa Romeo 166 2.4 JTD
Overview
Manufacturer Fiat/GM
Also called
Combustion chamber
Configuration I5
Displacement 2,387 cc (145.7 cu in)
Cylinder bore 82 mm
Piston stroke 90.4 mm
Cylinder block alloy Cast iron
Valvetrain OHC
Compression ratio 18,5
Combustion
Fuel system Direct injection
2.3 L
Overview
Also called
Combustion chamber
Configuration I4
Displacement 2,287 cc (139.6 cu in)

Multijet is Fiat Chrysler Automobiles' term for its current common rail direct injection turbodiesel engine range. Most of the Fiat, Alfa Romeo, Lancia range as well as certain Chrysler, RAM Trucks, Jeep and Maserati vehicles have Multijet engines. 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. GM Powertrain Torino group in Turin, Italy manages their interest in these engines. Some PSA Peugeot Citroën diesel engines are also rebadged JTD units, and vice versa. The first-generation of Fiat's common rail diesel engine was known as JTD, an initialism of uniJet Turbo Diesel.

The property that distinguishes the Multijet from previous generations of common rail diesel engines from FCA is the combustion of the fuel, which is split into multiple injections, thus allowing for a more complete, quieter combustion in the cylinder. Compared to the first-generation JTD engines 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 consumptions and emissions. The time between injections has been reduced to 150 microseconds while the minimal injection quantity has been reduced from two to less than one microlitre.


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