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In general, either cast iron or aluminum is used for the engine block.

This forms the majority of material used in a engine.

For other parts such as the crankshaft, valves, bearings, clutches, etc, a bewildering array of materials are used. Everything from brass and magnesium, to case-hardened steel and titanium even ceramics and composites are found in engines.

Cork is even used in some engine designs, though it has been largely phased out of all modern designs.

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