Course pitch effects BMEP ?? Peak pressure slightly, but I can show you these effects on dyno runs, and it is barely worth discussing.
Please explain that, just because a coroner allegedly accepted it does NOT make the laws of physics change.
The reason the two died was because the pilot screwed up, big time. End of story.
The reason the crank failed was most likely due to significant problems induced by the deceased owner and his amazing maintenance problems. Read the coroners report closely and see why this is true.
The alleged damage from any time related records has nothing to do with it.
This was not a Rotax fault, nor the previous owner. The previous owner might have had some paperwork and regulatory issues, but the crank failure was not paper induced.
Plenty of people have survived a engine failure, despite crank failures, it was what they did after that that mattered.
How any of this can wind up BMEP on a Rotax is .....well tooth fairy stuff.
And a MP gauge in a NA aircraft is of very little value anyway, apart from calculating % power when ROP.