I have done the autopsy on the big bang at the Winton Shelby Fest.
It let go at 5500rpm with no warnings at all. I had only been taking it to 5500 as it was breaking down after that (missing ).
The crank is in three pieces, and there was no sign of any seizures or nuts or stuff letting go. The crank had just had enough, and decided to scare me to bits. At least it was good enough to wait until the last couple of laps. and one must look on the bright side of life as i wasn't going to go out for the last laps , but Warwick called me a cissy, so I had to go. If I had not have gone it probably would have blown up in the first run
at Morgan park in a couple of weeks time.