Circle L engine
| Circle L engine | |
|---|---|
| Combustion chamber | |
| Configuration | I4 |
| Displacement | 1,686 cc (102.9 cu in) |
| Cylinder bore | 79 mm (3.1 in) |
| Piston stroke | 86 mm (3.4 in) |
| Valvetrain | DOHC |
| Compression ratio | 16.5:1 |
| Combustion | |
| Fuel type | Diesel |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Output | |
| Power output | 55–96 kW (74–129 hp) |
| Specific power | 165–300 N·m (122–221 lb·ft) |
The Circle L is an automobile engine produced by GM Powertrain Poland in Poland. It is a 1,686 cc (1.686 L; 102.9 cu in) Diesel straight-4 originally designed by Isuzu but now owned by General Motors. The engine is used in Europe by GM's Opel subsidiary and by Honda.
In the late nineties the Japanese company Isuzu , who were known for the efficiency of its diesel engines, collaborated with General Motors on a new diesel engine for the European market for Opel and Vauxhall. For this purpose it opened a new plant in the city of Tychy, in Poland, called Isuzu Motor Polska.
For reasons of economy, GM and Izuzu chose not to make an engine from scratch, but rather evolved the new engine from an existing base. The Isuzu 4EE1 1.7-liter was chosen and developed into the "Circle L" family of engines, also known as the 4EE2.
The engine kept the same dimensions of 1.7 4EE1. The main differences are in the DOHC camshafts and direct injection. The first engines mounted a simple direct injection and met the Euro 3 standard, while the later engines met Euro 4 and used common rail injection technology. The 1.7 Circle L common rail engines were the first common rail engines used on an Opel.
60% of the components for the production of the engines at Izuzu Motor Polska come from Germany, as well as the aluminium alloy for the manufacture of the cylinder head. The Polish plant was responsible for the construction and the development of the valvetrain. The block, however, comes to Tychy already built by the Isuzu factory in Hokkaido, Japan.
These engines are particularly important for Opel since they are fitted to their best-selling models in a period in which diesel engines became extremely popular. Moreover, thanks to their great fuel economy and reduced emissions, Circle L engines were integrated into the family of Ecotec engines. Later Circle L engines became part of the Ecoflex family.
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Wikipedia