Abstract: An axial flow rotary valve (1) for an internal combustion engine and method of manufacture thereof. The valve comprising a centre portion (5) having a cylindrical periphery, inlet and exhaust portions (9, 16) both smaller in diameter than the centre portion, and an inlet port (3) and an exhaust port (4) terminating respectively as an inlet opening (6) and an exhaust opening (7) in the periphery of the centre portion. The centre portion having at least one elongate passage (21) communicating between the inlet portion and the exhaust portion, the whole of the passage being disposed circumferentially outside the openings and radially outside at least one of the inlet and exhaust portions.

Abstract: A steering rack for a vehicle rack and pinion steering gear and a method of manufacture thereof. The steering rack comprising a first member having a toothed region, attached to a tubular second member. The second member having at least one region of increased wall thickness and reduced bore diameter formed by an upsetting operation.