FAI have over 30 parts for this staple of Opel/Vauxhall engine line up. The Opel/Vauxhall 1.7 CDTi is a 1,686 cc (1.686 L; 102.9 cu in) diesel straight-4 originally designed by Isuzu. The Isuzu 4EE1 1.7-liter was chosen and developed into the “Circle L” family of engines, also known as the 4EE2. 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 engine kept the same dimensions as the Isuzu 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 Opel & Vauxhall.
These engines are particularly important for Opel/Vauxhall since they are fitted to their best-selling models. 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 A17DTC is the second diesel engine in the Opel/Vauxhall range to be included in the EcoFlex range (the first was a 1.3 Multijet engine from Fiat). Introduced in 2008, is based on the Z17DTJ engine developed simultaneously, and is characterized by a reduction of friction of the moving parts in order to optimize the thermal efficiency and meet the stricter Euro 5 standard.