Quote:
Originally Posted by mechman600
Diesel trucks are down to 0.2 g/hp-hr, from 1.2 in 2007, 2.5 in 2002, 5.0 in 1994. That's as close to zero that EPA cares about for now. It would be interesting to get an equivalent unit of measure for the automotive side to compare.
|
Assuming 200g/kWh BSFC that's ~1/750th of the fuel mass emitted as NOx, or about 1/3000th of the exhaust gas (about 3 oxygens per carbon gives you the right mass ratios), which would be 333ppm. I believe the standard for gasoline engines is now under 5ppm, considering how it says the "average" for NOx at smog tests is like 2-4ppm. That would be in line with 1mg/mile or so.
Besides, most of the diesel powered vehicles are not new. Most of the ones I see make all the air along the street unbreathable as they pass by, which even a de-catted car doesn't do.