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Old 07-28-2017, 08:10 PM   #1 (permalink)
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Thumbs down My first and hopefully last corral entry, and it's hypothetical

Wouldn't running variable 20something:1 (basically, maximum lean running) to 11:1 (rich max) AFM with a high compression ratio, electronic spark control, diesel-type exhaust scrubbing and multiport direct injection on the late side of the compression stroke (similar to diesel) have reasonable efficiency? I mean, it's running lean, so it is burning more of the fuel and it's probably producing way too much NOx... but would it burn less fuel per horsepower at part-throttle, where the throttle would be more open for the same power level?

I realise Honda did a less extreme version of this, and probably Chrysler too.

But this seems pretty #Unicorn to me.

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Old 07-28-2017, 11:13 PM   #2 (permalink)
It's all about Diesel
 
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It doesn't sound totally unicorn-ish at all.
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Old 07-29-2017, 02:45 PM   #3 (permalink)
...beats walking...
 
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Lean-burn works and is VERY fuel efficient, but EPA kills it because it doesn't play-well with catalytic converters and emits too much NOx.
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Old 07-30-2017, 12:20 AM   #4 (permalink)
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you could still use a diesel-type exhaust system (2 way cat, and DEF system)
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Old 08-01-2017, 01:02 AM   #5 (permalink)
It's all about Diesel
 
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I'd rather use water injection instead of DEF.

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