The Euro 5 and Euro 6 EE20 engines had a closed-loop diesel particulate filter DPF ; both the oxidation catalyst and DPF were positioned next to the turbocharger to utilise the heat of the exhaust air.
For the EE20 engine, all five main bearings in the cylinder block had metal matrix composite journals inserted during the cast process for rigidity and due to their similar thermal expansion to the crankshaft.
EGR and DPF The EE20 diesel engine had a water-cooled exhaust gas recirculation EGR system which recirculated exhaust gases to the intake to lower combustion temperatures and reduce NOx emissions.
Furthermore, cooling slits between the cylinder bores provided water cooling channels.
IHI turbocharger The EE20 engines have IHI turbochargers with variable nozzle turbines VNTs.
The EE20 engine had double overhead camshafts DOHC per cylinder bank that were driven by a chain and gear with a speed-reducing gear.