I know that Lycoming doesn't recommend leaning below 75% and I suspect that may be conservative as well, at least when at lower loads (i.e. lower MAP's as seen with FP prop configs). I have been setting up at cruise in the 80% power area and then go LOP. That brings my % of HP down to 70-75% power once LOP. My question to the experts: Does this approach fall within the <75% power recommendation for safe performance? I have seen the detonation charts that Dan has posted and it seems that under square configurations showed no detonation potential. My typical cruise configurations are similar to 2600 & 23".
Thanks,
Larry
Thanks,
Larry