Circle L engine

The Circle L is a 1.7 litre inline-four turbocharged diesel engine with 16 valves, originally the Isuzu 4EE2. Isuzu designed it as part of its E family of compact diesels by developing the existing 4EE1, and it was built for Opel and Vauxhall at a new plant in Tychy, Poland, with the blocks shipped from Japan. After General Motors took over the rights to the design it was renamed Circle L, and it was later folded into the Ecotec and Ecoflex families. It powered best selling Opels such as the Corsa, Astra, Meriva and Zafira, and versions were also supplied to Chevrolet and Honda. The first engines used simple direct injection and met Euro 3, while later ones used common rail injection and met Euro 4 and Euro 5.