Name this bolt! Multi-part, bazaar mode of failure!

[litteng]

from an engineering POV it is awesome to see these things scattered about, but as a customer driving the same thing I cringe...

what a condemnation of Porsche business management over quality

[Frank M]

With that blackening on the big end, it looks like the rod bearing had been spinning prior to snapping the other bolt.

[yelojkt]

Any idea if this engine been opened up before or was it a factory built motor?

[Jake Raby]

Originally Posted by Frank M

With that blackening on the big end, it looks like the rod bearing had been spinning prior to snapping the other bolt.

That happened when just one bolt remained to fasten the rod cap..

The engine still had the factory case half sealant, it had never been torn down.

The bolt wasn't installed loose, the material it is made of and the torque to yield nature of it allowed the bolt to loosen over time and operation.

[BYprodriver]

Originally Posted by litteng

from an engineering POV it is awesome to see these things scattered about, but as a customer driving the same thing I cringe...

what a condemnation of Porsche business management over quality

Maybe Porsche is outsourceing engine assembly or remanufacturing.

Excellent example of why critical bolts don't get installed without final torqueing.