Figure 85. — The famous Rolls-Royce "Silver Ghost" series started with the 1 907 

 version, of which this is a model, and was continued for almost 20 years with 

 only minor mechanical changes. 



The full-sized car has a 6-cylinder engine of 4 1 / / 2-inch 

 bore and 4 1 / / 2-inch stroke, developing about 48 horsepower. 

 The cylinders are cast in two groups of three, with the 

 valves all on one side and operated from a single camshaft 

 located in the crankcase. The crankshaft is hollow and 

 has a main bearing between each two adjacent cranks. 

 Forced lubrication was provided. The crankcase is of 

 aluminum, and the oil pan can be easily removed for in- 

 spection. The fuel mixture was supplied by an automatic 

 carburetor, which could be adjusted for richness from the 

 dashboard, and the speed was controlled by a centrifugal 

 governor acting on a throttle valve. Both battery and 

 magneto ignition are fitted to the engine, each system using 

 a separate set of spark plugs. The cylinders were cooled 

 by water jackets into which the water was forced by a 

 rotary pump from the radiator, in front of the engine. A 

 belt-driven fan is mounted behind the radiator. 



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