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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).
Tests conducted to reduce power losses in Bentley engine silencing systems.

Identifier  ExFiles\Box 152\3\  scan0225
Date  5th November 1937
  
1297
Spare
see 223 for prints
Note No prints attached
5.11.37.

BENTLEY SILENCING SYSTEMS.

A consideration of the silencer losses in the various H.R. engine units, showed a loss in the region of 2%. Various tests were therefore run on the O.H.S. engine, to see how these losses could be reduced.

Sketches of the various systems tried are as shown on Fig. (1), and a list of tests is as under :-

(1) Effect of total power output on silencer losses (Figs. (2) and (3)).

(2) Effect of twin manifolds with a standard Bentley exhaust system, as compared with a single manifold with the same exhaust system, and also with a straight through pipe. (Fig. (4) )

(3) Effect of interference system evolved on a wave effect principle using various types of rear silencer arrangements as illustrated in Fig. 1 (Fig.5).
  
  


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