JTS engine
| Alfa Romeo JTS engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Alfa Romeo |
| Production | 2002–2011 |
| Combustion chamber | |
| Configuration | DOHC 4-valve I4, 60° V6 |
| Displacement | 1,859 cc (113.4 cu in) 1,970 cc (120 cu in) 2,198 cc (134.1 cu in) 3,195 cc (195.0 cu in) |
| Cylinder block alloy | aluminium alloy (2.0 JTS cast-iron) |
| Cylinder head alloy | aluminium alloy |
| Combustion | |
| Fuel type | Petrol |
| Cooling system | Watercooled |
| Output | |
| Power output | 118 kW (160 PS)-191 kW (260 PS) |
| Dimensions | |
| Dry weight | 168 kg (370 lb) (3.6 V6 High Feature engine) |
| Chronology | |
| Predecessor |
Alfa Romeo TwinSpark Alfa Romeo V6 engine |
The JTS engine (Jet Thrust Stoichiometric) is a gasoline direct injection engine produced by Alfa Romeo. It exists in two forms, straight-4 and V6, and was introduced into the Alfa lineup in 2002.
The JTS engine debuted in 2002 in the Alfa Romeo 156. The engine was based on the 2.0 Twin Spark, replacing Twin Spark with direct injection, dubbed "Jet Thrust Stoichiometric". This improved power from 114 kW (155 PS; 153 hp) to 121 kW (165 PS; 162 hp), but more importantly, torque climbed from 187 N·m (138 lb·ft) to 206 N·m (152 lb·ft). In 2003, this engine was introduced to the GTV/Spider coupé and roadster. In spite of its benefits to power, torque and economy, the JTS was not used in the smaller 147 or the larger 166, and much less in other models from the Fiat Group. This was allegedly because the JTS engine cost a lot more to produce than the Twin Spark.
Applications:
It was only in 2005, with the arrival of the 159, that more variants of the JTS were produced. The 2.0 JTS gave way to a 1.9 L variant with 118 kW (160 PS) and a 2.2 L version with 136 kW (185 PS). The 1.9JTS and 2.2JTS form part of a new engine family and are completely different from the 2.0JTS. Both 1.9 L and 2.2 L have chain driven camshafts and variable valve timing on both inlet and exhaust camshafts. Both current 1.9 and 2.2 JTS engine blocks are supplied by GM to the Fiat group. Both models are mapped to either a six-speed manual gearbox plus a reverse gear, or a Formula One inspired sequential gearbox also having six gears and reverse.
Applications:
With the arrival of 159 was also introduced 2.2 JTS, the engine block is sourced from GM (GM Ecotec L61).
Applications:
The JTS direct injection system was first used in a V6 engine in 2005 with the introduction of the Alfa 159 and Brera. This is not related to the Alfa Romeo V6 engine, but is instead a derivation of the GM High Feature engine; built in Australia by GM Holden. While it retains the High Feature engine's 89 mm (3.5 in) bore, 85.6 mm (3.37 in) stroke and chain driven camshafts. It is modified by Alfa for their performance, fuel economy and sound characteristics. These modifications include: "TwinPhaser" variable valve timing (cam-phasing on both inlet and exhaust cams, thus the name), gasoline direct injection and a higher compression ratio of 11.25:1. It also operates with a lean burn system up to about 1500 rpm, as on many other engines from the company. And is capable of generating 191 kW (260 PS; 256 hp), a number matching the larger LY7 3.6 L variant used by GM. Alfa Romeo stopped using the V6 JTS engine in 2010.
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