Rolls-Royce Archives
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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).
Performance losses due to different silencer configurations on a vehicle.

Identifier  ExFiles\Box 18\3\  Scan346
Date  10th August 1932
  
SILENCER LOSSES.

10.8.32.

Tests 114° Camshaft. 5.25 c.r.

7" X 20" Tyres. R.R. Semi Expanding Carburetter.

22-EX. 11 X 41 Axle
Brooklands
Standard Silencer.

Mean Lap Speed. MPH.
Cut-Out Open Cut-out closed
87.53 81.64

Difference C.O. Open and Closed with Standard Silencer. 5.9 M.P.H.

19-EX. 12 X 41 Axle
6" X 19" Wheels
Chateauroux
Resonance Silencer.

Mean 1/2 mile speed.
Silencer removed. C.O. closed.
86.5 m.p.h. 84.5 m.p.h.

Difference C.O. Open and Closed with Resonance Silencer. 2.0 M.P.H.
  
  


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