The early cranks there were some failures but the latest ones are flawless.
The EVO 3s are awsome holding their tune and pulling crazy power.
I just finished running the SIRIO EVO 3 at the Aussie nationals and the engine is at least as quick if not quicker than the quickest and latest around.
Infact I was in the same qualifiers as the winner (LRP) and was backing off at the end of the straight as courtesy to him so as i would not clean him up.
And balls out of the corner, lots of them.
Any busted cranks should be replaced by your Sirio supplier but I can guarntee that the new engines are bullet proof.
Cheers
Alex.K