Major engine failure on take off

There is about a 5mm gap where the conrod meets the crackshaft. Not sure why this has occured. The piston rings had torn away, and we susspected this was the cause of damage. Will get some clearer photos and post. 

OK, well for sure the crankshaft started to separate.  Given this is a turbo engine i would suspect an overboost happened.  It is a press fit crankshaft and once it starts to slip then not much can be done.  Be sure to return the TCU to the repair person, they can read the files of the boost pressure and confirm this.  The total engine life will be recording the peak limits in each channel, one of those is boost pressure.  if the wastegate was sticking and it was overboost then they can tell.  

Cheers

There is supposed to be an overboost warning lamp for the 914.  Did anyone notice this ever coming on (not necessarily at the time of stoppage, but also during previous flights)?

Good morning all!

I saw something like this once in my life, but was an over rev and over boosting together, the operator took off with 115% of power, and the Westgate remained closed, causing an over boost, and he had an variable pitch prop., but he kept the engine running for more than 5 minutes in this condition, after that, the engine lost power, the owner made an emergency land, no damages to aircraft or occupants, but the crankshaft got almost the same as yours, with a huge gap in the connecting road