GM selects SCR for its first 50-state compliant diesel V8 General Motors (GM) has announced plans to launch its first 50-state compliant V8 diesel engine range by 2009. The 4.5l V8 Duramax turbo-diesel engine is designed for use in GM's heavier range of vehicles including pickups and the Hummer H2. Use of the clean-diesel engine will increase fuel efficiency, reducing emissions of CO2. The announcement comes as pressure mounts on manufacturers, from both executive and legislative branches of the US government, to improve fuel efficiency. The planned Duramax V8 engine will use a high-pressure, common-rail fuel injection system with an SCR NOx aftertreatment system and DPF to curb emissions. GM claims that the use of advanced diesel engine technology will increase fuel efficiency by 25% and decrease CO2 emissions by 13% (in comparison to equivalent petrol engine vehicle). It should be noted that the use of combined SCR and DPF will allow the Duramax V8 to meet both Tier 2 Bin 5 and LEV 2 emissions legislation, currently the world's most stringent light-duty emissions legislation. | 
