Quote:
Originally Posted by some_other_dave
Which standards? The current ones for new vehicles? If so, that would be very interesting.
-soD
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Good point. Most folks have no idea just how far the regs have come down.
Consider heavy-duty diesel truck engines (semi truck engines):
In 1988 the NOx limit was 10.7 g/hp-hr.
In 2007 the NOx limit was 0.2 g/hp-hr.
That's 53 times less NOx! 2007 is only 1.9% of what it was in 1988!
FYI, at the same time particulates also went from 0.6 g/hp-hr to 0.01 g/hp-hr--60 times less.