Quote:
Originally Posted by Old Tele man
Q: Why no more lean burn??
A: EPA regulations.
Notice how "Best Economy" ( blue line, ie: Lean Burn) coincides with NOx peak in below graph...and, remember, it's NOx which creates LA's brown-smog.
• source: EndTuning - Air Fuel Ratios |
If this graph is true, lean burn can actually reduce fuel economy & emissions. Notice the peak nox occurs around 16 on the A/F scale, but Honda lean burn applications run up to about 25:1. So if we run a lean burn of 18:1 not only are we using less CO2 and nox than regular burn, we are using much less fuel.
So it really isn't valid to say that lean burn is banned because it creates more nox, when clearly at certain ratios it actually produces less emissions and returns higher MPG. Or am I reading the graph wrong?