And with these late model plastic aircraft with first life engines we dont see many if ever clyinder head cracking we do see exhaust valve destress and a lot off it.
Both lyc and cont have put alot of work on to their engines of late. While they may retain the outward appearance they are made of better materials than past engines. When you do your o/h replace the cylinders with new.
I recently was talking to a frim tnat they done two o/h with 2nd life cylinders and had failures at periodic inspection since they replace them all with new and get a full run out the engine till next o/h.
So who here has ever detenated an aviation engine. The last one i know off was across the spencer gulf in the chieftan because he didnt push the red knob first. And before a certain individuals say but the crank was cracked on that engine the crank did not fail so tnat is tottaly irrelevant. It failed because it was to lean and went into self destruct mode period. The evidence is quite clear on this fact.
If you ever get to have a look at an aircraft crank rod bearings they are extremely lagre for the power they produce against a cars of the same power.
Manufacturers make them like this for a reason and produce a manual for the engine for the same reason.
Isf aps is so good why dont they start producing their own manuals our even get their courses and manuals for operating engines approved. Just like everyone else has too.