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Old 11-01-2012, 02:55 PM   #3154
Beastly Adventurer
Joined: Nov 2006
Location: NE Oregon
Oddometer: 5,480
Lean = Cooler?

PM wrote in #3146: "A hot motor, with warm intake air, will continue to run on very lean mixtures. The motor doesn't make the same power as it does with a richer mixture, but it runs cooler and emissions are lower."

I may be misreading this...lean = cooler = lower emissions? I get the emissions part but thought lean mixture increases cylinder temps. Hence if the input temp from sensor indicated a lower ambient temp, the mixture would go richer for the denser air and engine would run cooler due to presence of more fuel. But, hey, I could be wrong.
"In Wallowas"
2007 R1200GS Adventure " explore off-road, alone in my case, way out in the boonies...that feeds the soul!" After 2014 BOM my bike is forthwith the "GS McGee"!
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