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California98Civic · 04-02-2018, 08:19 PM

Up until about 17.5:1, according to this basic image, only O2 is rising from stoich. CO continues a slow decline and only HC begins to rise after roughly 18:1. So seems a mild leaner burn could be accomplished at light cruise and 18:1 with a net polution benefit, unless oxygen is somehow more menacing than I realize.

04-02-2018, 08:19 PM	#3 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,174 Times in 1,470 Posts	Up until about 17.5:1, according to this basic image, only O2 is rising from stoich. CO continues a slow decline and only HC begins to rise after roughly 18:1. So seems a mild leaner burn could be accomplished at light cruise and 18:1 with a net polution benefit, unless oxygen is somehow more menacing than I realize. __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.