Quote:
Originally Posted by GregWeld
Well --- Neither of the above gurus answered your question... 
Running "lean" at cruise will not damage your engine.... Cruise is LIGHT LOAD... flat street -- just motoring down the road. Lean WILL damage your engine under LOAD.
15 A/F ratios at lightly loaded cruise conditions are fine. |
If it's not surging at cruise/light load then it's fine. 15's at cruise won't hurt the engine. As above, at WOT with a naturally aspirated combo 12.8-13.2 A/F is normal; I usually lean towards upper 12's though just as a safety factor, even though some combos make a bit more power at low 13's A/F at wide open throttle and full load.