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Conrod issue

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What would be the reason for an conrod to bend

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High boost or hydraulic combustion i.e.water in the combustion chamber.

The short answer is high cylinder pressure. The real question is, what caused the high cylinder pressure? With a stock rod this could easily be from adding boost to an N/A engine, or running too much boost on a factory turbo engine. Given the fact you're running an aftermarket rod, this makes bending the rod a little tougher. What are the conditions around this failure?