Why don't expert automobile mechanics design engines or are mechanical engineers that design engines by nature expert engine mechanics?

Why don't expert automobile mechanics design engines or are mechanical engineers that design engines by nature expert engine mechanics?
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1 Answer

Answer :

You need to know physics to tee to design an engine. I know how to take apart my PC and reassemble it and do trouble shooting, but I have no idea how to design a processor or board pathway layouts.
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