Quote:
Originally Posted by serialk11r
We're kind of veering off topic since none of this is stuff is realistic DIY mods, but IIRC a problem with stratified charge is that the leaner areas don't burn well and the fuel there is sort of wasted. A higher energy ignition system, preferably that ignites the cylinder at multiple points, that can ignite a more homogeneous lean mixture is optimal.
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The early Civic Hybrid used two spark plugs per cylinder for this reason, but oddly, the Insight (Honda's highest thermally efficient engine until the Clarity) did not.
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I imagine that, past a just slightly lean, learn burn isn't providing more complete combustion of fuel, but is instead only reducing pumping losses by increasing load? Or are there other reasons it improves efficiency?