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the car wasn't under full load at the time of failure so its not the peak power rating that snapped the crank. I would expect that the crank has been cracked for a long time... maybe even since the motor was built or shortly thereafter. In this scenario, the dyno pulls and street pulls would have caused progressive crack growth... jumping forward a bit more every time the crank was highly loaded. The crack was probably as much as half or more of the way through just before the burnout and that final loading caused sudden failure of the remaining material. It would be a good idea to examine the crank under a microscope to determine the nature of the failure. The point of origin should be identifiable and potentially even the root cause. 
 
what? It looks a little stumpy, but fits great in the hand! (n/m) - ZEngineer
12/12/06 |
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Here's my take on it... - 
