Quote:
Originally Posted by CanAutM3
Clearly not a "manufacturing" issue, it is how it was designed.
If you look at the crank hub design, it is apparent that it was engineered as a "mechanical fuse", intended to slip in the advent the valvetrain is loaded beyond a certain threshold. If the engineers did not want it to slip, they would have made a splined design.
An aftermarket tune can definitely alter the acceleration characteristics of the engine making it more prone to SCH failures.
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That is completely wrong information.
An engineer that worked on the S55 came on this board and said it absolutely is not a fuse. It was designed this way to be easier to work on.
This is to paraphrase an engineer that helped design the engine.