Abstract: A one-piece housing casting comprising a hub adapted to receive a turbine shaft therethrough and a radially extending flange on the outer periphery of the hub. The flange includes radially aligned annular surface portion and means for spacing the surface a predetermined distance from a radially aligned housing wall close to the outlet of the centrifugal compressor. The flange also includes an axially extended portion having an axially extended surface and means for spacing the surface away from an axially extending surface on a turbine housing wall to define a passage therebetween. Preferably, the means for spacing the walls apart from the turbine housing wall surfaces comprise diffuser vanes integrally formed on the radially and axially aligned surfaces of the flange of the diffuser member.

Abstract: A fuel control system is provided for a turbine engine for delivering fuel from a fuel source and to the turbine engine combustion chamber to maximize fuel economy engine efficiency. The fuel control system comprises a fuel pump having its outlet connected to the inlet of a fuel control assembly while the outlet from the fuel control assembly is connected to the combustion chamber. A variable orifice within the fuel control assembly is responsive both to the differential pressure between the compressor inlet and outlet as well as the position of the engine throttle to vary the flow rate through the fuel control assembly and to the combustion chamber.