• Jun 19, 2006
General Motors has decided to go ahead with plans to rework its 6.6L Duramax diesel V8 engine in anticipation of the new Tier 2 Bin 5 emissions standards that will take effect on January 1st. The new standards call for a 90-percent reduction of oxides of nitrogen and particulate matter. Though the changes won't interrupt production of the Chevy Silverado and GMC Sierra heavy-duty pickups in which the engines are used, they will sharply increase the cost of building the engines. GM Powertrain expects to meet the standards by using a new variable geometry turbo, enhancing the engine's exhaust gas recirculation and using a closed crankcase ventilation system. The exhaust system will also be supplemented with an oxidizing catalytic converter and particulate filter like those first introduced on many European diesels a couple of years ago.

You may remember Ford's plans to meet the new standards, which include using expensive piezo injectors on its new 6.4L twin-turbo Powerstroke diesel. Dodge has not revealed yet how it plans to get the Ram's Cummins diesel up to snuff by January 1st.

[Source: Autoweek]


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      • 8 Years Ago
      what the auto industry really needs is not more expensive diesels, but better fuel to burn ULSD, and biodiesel- which shoul lower the emissions enough for tier 2. what i do not understand is how a mercedes bluetec diesel can be only a 1000 dollar option on a e-class and only a american pickup over 6,000 dollars. sure the emission requirements are pricey reworkings of the engines, but come on, what about supply and demand, there needs to be more mass production of diesel engines outside america with cheap labor. i read that the duramax is assembled in Ohio, for example, that is more expensive, go to canada...
      • 8 Years Ago
      This is so silly. The particulate filters make sense, and those aren't much of a problem, as soon as the ULSD is available.

      But the NOx reduction is not based on sound science, and needs to be revisited.

      http://www.aei.org/publications/pubID.19746/pub_detail.asp

      A crackdown on VOCs would make more sense at this time. A big source of VOCs is the refueling of gasoline powered vehicles.