Quote:
Originally Posted by brucepick
Of course there's a power drop at that instant because the air volume to the cylinder is unchanged, and the fuel qty dropped. Some of that air isn't "getting fuel". Less fuel is being burned in the cylinder - where it counts. But that's OK. I step into the gas a bit and keep the car moving at the speed I want.
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And here, we have further confirmation of an increase in RPM, with Lean-burn.
Arcosine, thanks. Great article. Somehow I'm not convinced that it was manifold pressure impacting negatively on fuel consumption beyond 15.5:1. I really needed to see a BSFC map to believe it. Otherwise how/why do all other Lean-burn engines operate in the 20-25:1 AFR's?
Or maybe it does, which is another reason for manufacturers to set low-rpm limits under which Lean-burn happens?
