Fiat 1.9 JTD M: New Twin Stage Turbo Diesel Engine Available With 180 & 191Hp

Fiat Group presented the latest development of its 120 & 150Hp 1.9 JTD M diesel engine used in a variety of Fiat, Alfa Romeo and GM Group models. The revised version of Fiat Group’s 1.9-liter diesel engine that features twin stage turbo technology will be offered in two versions: one with 180Hp (132 kW), available to customers outside the Fiat Group, as well as Fiat Group brands, and a higher performance 191Hp (140 kW) version, which will remain the preserve of the Alfa Romeo, Fiat and Lancia brands. The answer to the question whether the 2008 Saab 9-3’s new 180Hp 1.9 TTDi has anything to do with Fiat Group’s new 1.9 JTD M is yes. (photo 2.4 JTD M) -Continued after the jump

Compared to existing 1.9 litre JTD M (MultiJet) engines, low end torque has been improved by 50 per cent, with 300 Nm (221 lb ft) available from just 1250 rpm. This performance upgrade has been achieved through the introduction of advanced turbocharging technology together with design changes to increase the thermostructural resistance that allows increased peak cylinder pressure up to 180 bar and exhaust gas temperatures up to 800°C.

According to Fiat, two stage turbocharging enables the new engine to combine the instant low speed response and the elimination of ‘turbo lag’ provided by a small turbocharger, while the second stage offers the ‘deep breathing’ provided by a large turbocharger. Essentially, a small turbocharger operates at low RPM for optimal bottom end torque and response from low vehicle speed. This small turbo is by-passed when the required power output increases, and a second turbocharger of a larger size comes into operation.

Besides the improvement in overall performance, TST technology allows an increase in the exhaust gas recirculation rate without fuel consumption penalties, and therefore providing a significant reduction in NOx emissions.

Thus, the engine complies with projected Euro 5 emission standards. This target has been achieved thanks to:

• Reduction of the compression ratio from 17.5 to 16.5 and the adoption of low-voltage metallic glow plugs
• Improved EGR cooler (with by-pass) and EGR valve adoption on Lambda sensor with DPF
• New inlet port design

Production of the new engine will start in July this year, beginning with the 132 kW (180Hp) version. The 140 kW (191Hp) version is to be launched in June 2008.

TECHNICAL SPECIFICATION

• Cylinders In-line 4
• Displacement 1910 cc
• Bore x Stroke 82 x 90.4 mm
• Compression ratio 16.5:1
• Valves per cyl. 4
• Max Power 132 kW (177 hp) @ 4000 rpm / 140 kW (188 hp) @ 4000 rpm
• Torque 400 Nm @ 2000 rpm
• Inj. System MultiJet common-rail, 1600 bar
• Emissions Compliance with projected Euro 5
• Supercharging Twin Stage Turbocharger, with waste-gate system
• Mass (Din – 70020A) 185 kg
• Dimensions (LxWxH) 679/551/712 mm
• Block Cast iron
• Cylinder head Aluminium alloy, 16 valves
• Drivetrain DOHC belt driven, cam-to-cam gears
• Production plant FMA (Pratola Serra, Italy)