Quote:
Originally Posted by mgarblik
.... Possibly just incredible good luck, I don't know......
I know they do break every now and then because I have seen pictures posted here.
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Even in a controlled fatigue test of machined test coupons, the variation in cycles to fail under identical conditions is huge. Say you test 100 parts and the first fail happens at 1000 cycles... the 100th sample to fail might take over 1,000,000 cycles. This is the nasty truth about fatigue failure.
Now imagine you all have the same engine in the same car on the same dragstrip. The first crank could fail after 100 passes. The next might go 500. Another might go 3000.
So yes, you could be lucky or maybe you weren't even close to failing. But if you see one break that is close to your build and usage, I would wonder if yours is special or just that 99th percentile crank.