Patent ID: 8067844

Claim:
An engine generator set comprising an internal combustion engine having an output shaft that is coupled to an electrical generator for producing an AC electrical power output, the engine being operable to rotate the shaft at a first rotational speed so that the generator is driven to produce electrical power at a first frequency and a second rotational speed at which the generator is driven to produce electrical power at a second frequency, the engine being operatively connected to an exhaust gas turbocharger, the turbocharger comprising an engine exhaust gas turbine connected to a compressor for rotation therewith, the compressor having a housing defining a gas inlet for directing gas flow to an impeller wheel mounted for rotation in the housing about an axis and an outlet for delivering compressed gas to the engine, wherein the compressor further comprises interchangeable first and second guide vane assemblies that are each releasably and selectively connectable to the inlet, guide vanes of the guide vane assemblies extending in a downstream direction from a leading edge towards the impeller wheel, the guide vanes of the first guide vane assembly extending in a first direction relative to the gas inlet and the guide vanes of the second guide vane assembly extending in a second direction relative to the gas inlet.