Re: Diesel additive


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Posted by Desoto61 [138.162.0.43] on Wednesday, November 18, 2015 at 15:32:26 :

In Reply to: Re: Diesel additive posted by John in Utah [166.70.201.2] on Wednesday, November 18, 2015 at 12:03:09 :

Close, but by default diesel can run much leaner than gasoline which generates higher amounts of NOx, and under load you can get higher particulats (soot). Because US emissions require diesel engines to meet the gas engine requirements a catalytic converter is required for a diesel engine too. However the gas ones will be damaged by the way diesel operates. So the urea is injected to allow the catalyst to do it's job chemically.

But like gas engines, fuel economy now becomes secondary to emissions, so many diesel engines have to run richer at times to support the catalytic converter operation and efficiency drops.

The emissions regulations were phased in, so the VW issue was they stated they didn't need the expensive redesign of their diesel because of the way it was designed at the lower tier which ended a year or so ago. Cummins did the same with their engines years ago. But inevitably the increasingly more restrictive regulations were going to require it any way, as both VW and Dodge require it on current models.



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