Quote:
Originally Posted by American Viking
I'm not big fan of the crazy lean burn engines either, but I like to be just a bit leaner than stoichiometric ratio.
If these hybrids and the new ICE's that shut off at traffic lights, either have to some quick heat-up protocol (either a shot of raw fuel directly at the cat to flash it off, a blowtorch hot air injection just ahead of the cat to thermally kick it up, or an electric heater built into the casing & honeycomb matrix) or they must have some exemption from the startup flash-off time. It used to be called the 240 (second) test.
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Uh, I don't know if you notice but cold engines running stoichiometric smell horrible. I don't know if mixed port/direct injection engines are able to not use a catalyst, but they'd fail NOx, and so would your lean of stoichiometric burn.
Cars do not run rich to heat the cat up, they retard timing. Wastes fuel, but doesn't increase pollution. Start stop is usually disabled when the engine is cold, again not a problem.