Leaning the IO 540 . . . .

I don't mean to start the fight but I found this in the Operator Manual from Lycoming:


A.  LEANING TO EXHAUST GAS TEMPERATURE GAGE.

1.  Normally aspirated engines with fuel injectors or carburetors.

(a)  Maximum Power Cruise (approximately 75% power) – Never lean beyond 150°F on rich side of peak EGT unless aircraft operator’s manual shows otherwise. Monitor cylinder head temperatures.

(b)  Best Economy Cruise (approximately 75% power and below) – Operate at peak EGT.

See the link to the right for the Operator Manual and the whole language about leaning . . . .