Quote:
Originally Posted by MosersMopars
Apparently I'm a lot clearer in my own head than in type. WHAT changes made to this engine series allow for no EGR? Valve timing and overlap? Fuel mapping? And HOW?
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The engines weren't made more efficient or cleaner, they were given a classification that dodged those requirements. It was a paperwork shuffle, kind of like classifying the Neon wagon (PT Cruiser) as a truck for CAFE purposes. The HD rating was probably a CAFE dodge as well, because the heavy duty trucks didn't have to post mileage ratings (it's a work truck, not a highway cruiser).