Running below green arc MP

455 Bravo Uniform

Final Approach
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Aug 18, 2015
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455 Bravo Uniform
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So let’s say shock cooling is well managed and you pull the MP below green (15-25” in my contraption) and operate there for a long time? What bad stuff happens to the engine?

For instance, if I point the nose down, the prop will likely “windmill” and drive the rotating assembly, instead of the other way around, correct?

In a car with a manual transmission going downhill while engine braking, the timing chain/gear are loaded in the opposite direction, and rings are working opposite, and you may pull a lot of crankcase oil mist into the cylinders.

Other than the oil issue and maybe low temp lead/carbon, what else in a plane is bad for the mill when operating here in a prolonged manner?
 
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