What is the top cruising power setting that will not damage the engine running rich of peak?

[A64Pilot]

Now I don’t have a Bravo and haven’t operated one, but going from nearly no oil consumption to a qt an hour doesn’t make sense for an engine. I’ve seen engines that when run hard consumption increases some but nothing like that.

Makes me wonder if the oil isn’t going out of the turbo?

[jlunseth]

On 9/9/2023 at 8:07 AM, A64Pilot said:

Makes me wonder if the oil isn’t going out of the turbo?

Or out of someplace else? When you run at 75 vs. 65 you are increasing the pressure inside the engine, which is vented through the breather. That pressure can push the oil out pretty much anywhere there is an exit. Do you have oil on the belly? Have you checked the quick drain, or the rocker covers? Sure, it could be something internal to the cylinders but that is not the only possibility. Had the same sort of problem when I first got my 231, turned out the quick drain was not sealing. Got rid of that problem, and the engine went from a quart an hour to a quart every oil change at 25-35 hrs.