Abstract: A process is described for the production of engineering components wherein the process comprises filling a die cavity within a die assembly with molten metal by utilizing centrifugal force, the die cavity being rotated about an axis remote from the actual component cavity at a rotational velocity sufficient to produce an acceleration of at least 200`g` on the molten metal in the die cavity. The production of a piston having a fibrous reinforcing insert is described.

Abstract: The problem of cracking in scantlings of aluminium or aluminium alloy engine blocks by direct and torsional forces applied thereto by a crankshaft is mitigated by casting, into the scantlings, reinforcements of a ferrous material. Each reinforcement includes threaded bosses for receiving the bolts which hold an associated cap onto the scantling and also flat elongate members which extend into the scantling. Since the threads are of a ferrous material, they are more resistant to damage than similar threads of aluminium or aluminium alloy and the elongate members spread the loading throughout the scantling, so reducing the tendency of these loads to crack the scantling. This technique can be of particular benefit where an engine is being modified in a way which produces increased stresses; for example where a petrol engine is being converted for use as a diesel engine.