PR,
Unless you have a BMEP guage, stick to -50F on the rich side!!
Connie et al a/c with a BMEP guage use/d a 10% manual lean technique with the R-2800/3350's. I'll take the R-2000 on the DC-4 on advice.
Someone has come up with the concept of sliding onto the lean side with a gross misinterpretation of the "10% manual lean technique" on engines without the ability to accurately measure the effects.
G'day
