Isuzu 1.7 diesel engine - Isuzu 1.7 DTI engine - Isuzu engine

For reasons of economy, GM and Isuzu 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 Isuzu 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. The 1.7 4EE2 was offered in six variants, whose characteristics and applications are described below.