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ROLLS ROYCE SILVER WRAITH 1

 

Rolls Royce Silver Wraith

 

POINTS OF TECHNICAL INTEREST

The power unit is derived from the 20 Model introduced in 1922. The early versions measured 76.2mm bore x 114.3mm stroke which gave a capacity of 3127cc.The measurement of 4.15" between the bore centre lines was maintained throughout the lifespan of all of these engines and became a limiting factor in increasing its capacity beyond certain limits.All capacity increases up to these limits,were achieved by increasing the bore size. The 20 became the 20/25 in 1929, with a capacity of 3666cc and further increased in 1938 to 4257cc as the 25/30.These engines designated B60 were a considerable improvement on the previous B40 range with a new cylinder head incorporating an overhead inlet valve and a side exhaust valve (Inlet over exhaust IoE). The new engines powered the newly introduced Wraith in these pre war years, before more pressing matters concerned with the building of mighty aero V12,s stopped all car activities. The B60 engine was again enlarged in 1951 by increasing the bore to 92.07mm which gave a capacity of 4566cc. During 1954 the B60 engine was again increased in size to 4887cc and the cylinder liners were now full length. Rolls Royce have never revealed dynamometer outputs,but figures ranging from 132 to 150 BHP have been noted from various sources in the research for this account.The unusually positioned gear lever(on the drivers right) controlled an excellent 4 speed synchromesh gearbox,although 4 speed"Hydramatic" automatic transmission was available from 1952. The gearbox output also powered a unique to Rolls Royce,friction clutch driven servo to assist the braking.This idea was conceived by Hispano-Suiza and used by Rolls Royce for many years. Coachwork was traditionally supplied by the specialist coach builders such as Freestone & Webb,James Young,HJ Mulliner and others,this example was bodied by Park Ward and is a true Limousine with extra fold away seating behind the front seats. The 6 Cylinder engine was replaced in 1959 by the long awaited V8, the Wraith was also discontinued that year after over 1700 examples had been completed. This vehicle once performed Mayoral duties in London before coming to this collection.

General Information
REGISTRATION NUMBERNLC 333
AWMMT Cat No136
MANUFACTURERROLLS ROYCE
PARENT COMPANYROLLS ROYCE
MODELSILVER WRAITH 1
MILEAGE125100 SEP 89
YEAR1954
ENGINE
CUBIC CAPACITY4566cc
BORE92.1mm
STROKE114.3mm
CYLINDERS6
COMPRESSION RATIO6.4:1
VALVE GEARI o E see text
FUELLINGTwin SU electric pumps
CARBURETTORSSingle Zenith
IGNITION12v Pos earth Coil & dual
contact breaker
HP/BHP31.5 HP see text
TORQUEData not available.
TRANSMISSION
MAKERolls Royce
TYPEManual
NUMBER OF FORWARD SPEEDS4





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