Ricardo and Doosan Infracore unveiled the DL06 engine at the 22nd Aachen Colloquium on automobile and engine technology recently. The new Tier 4 Final version of the DL06 includes an ultra-low particulate combustion system featuring the Ricardo Twin Vortex Combustion System (TVCS) achieves compliance with Tier 4 Final particulate emissions levels without requirement for a DPF - providing a highly cost-effective and clean solution. The Doosan DL06 engine is a turbocharged and intercooled 5.9 litre, in-line 6-cylinder diesel engine used in both on-highway and off-highway applications. It features a 4-valve/cylinder head, with a central vertical injector location and high pressure common rail fuel injection system. Typical off-highway applications for the engine are excavators and wheeled loaders, made by Doosan and its subsidiaries such as US manufacturer, Bobcat. First introduced in 2005, the most recent version of the DL06 is certified to Tier 4 interim exhaust emissions regulations, and is equipped with cooled EGR to reduce NOx emissions and a DPF to minimize particulate. With the substantially reduced NOx levels required for Tier 4 Final compliance, Doosan has like many of its competitors opted to include Selective Catalytic Reduction (SCR) as part of its aftertreatment technology package.