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Don't know what the mechanism that causes the black deposits on the back of some overloaded bearings, but I have seen it on damaged bearings used in big block drag motors. May be due to heat combined with movement of the shell in the rod housing? I often wonder if Porsche used titanium connecting rods in the turbo race engines as an energy absorber of sorts not just for the reciprocating weight reduction. Titanium with a tensile strength = to high strength steel but an elastic modulus of approx 1/2 of steel can absorb a lot of energy. Energy in the form of detonation.
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