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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The performance of a B.50 model fitted with a cast iron engine and twin exhaust system.

Identifier  ExFiles\Box 111\3\  scan0106
Date  16th June 1939
  
800b & 1320 (Wyn's report only, in boo)

By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer}
c. Hs.{Lord Ernest Hives - Chair}
c. Da.{Bernard Day - Chassis Design}
c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}

Rm{William Robotham - Chief Engineer}5/R.16.6.39.

B.50 Fitted with C.I. Engine.

Attached is a copy of a report giving the results obtained on a B.50 fitted with the cast iron engine and twin exhaust system.

For a Sports car, the twin exhaust system seems definitely to be justified as it gives an increase of no less than 5 m.p.h. It is apparent that the cast iron engine is going to enables us to improve the performance of the standard B.V. car, since this B.50 fitted with a body weighing over 38 cwts. and having a frontal area considerably in excess of the B.V. achieved a lap speed of 89 1/2 m.p.h.

The lap speed of the present standard B.V. is 89 m.p.h., the P.III non-overdrive 86 m.p.h. The Wraith, which is directly comparable in body space and weight with B.50 laps about 74 m.p.h. in its present standard production condition.

Rm.{William Robotham - Chief Engineer}
  
  


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