Corvair conversion engines

Do you have a link for the broken cranks? I cannot find anything about
broken cranks on the "Corvair authority" site.

http://www.flycorvair.com/

I did find the following statement:

"I have never seen a cracked head, cylinder, case, crank or rod in the
hundreds of Corvair engines I have inspected. It is a very strong engine."

The Corvair engine has been flying since the early 1960's. Seems odd that
ANY flaw would only now be being discovered.






Everything seemed OK until yesterday when I read the most recent updates
on their website. Seems that the "untreated" automotive cranks have been
cracking in a very short time. Nitriding seems like the only solution.
But with standard cranks cracking at under 100 hours, what would be the
expected life of a nitrided crank. Twice as long, four times as long,
eight times as long? This would still fall short of the 1500 hour TBO
stated by the Corvair Authority.

Does anyone have any first hand experience with Corvair conversion
engines? Any info on their realistic life and reliability?

TIA,

CV