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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).
Power losses in different exhaust systems for the standard 40/50 model.

Identifier  ExFiles\Box 181\M7\  img049
Date  1st April 1924
  
POWER LOSSES TO EXHAUST SYSTEMS WITH THE W.W. AND DERBY SCHEMES ON THE STANDARD 40/50

The following figures give the loss in H.P. of the two schemes relative to the standard 40/50 system.

The tests were taken with cut-out open.

| R.P.M. | H.P. with std. 40/50 R.R. exh. system. | Power loss relative to standard |
|---|---|---|
| | | W.W. exh. system. H.P. | 'Derby' exh. system. H.P. |
| 2250 | 89 | 2.3 | 1.6 |
| 2000 | 84.4 | 3.3 | 1.7 |
| 1750 | 83.9 | 3.15 | .6 |
| 1500 | 74.6 | 2.17 | .7 |
| 1250 | 64 | 1.9 | .5 |
| 1000 | 51.2 | .45 | .3 |
| 750 | 38.3 | --- | .2 |
| 500 | 25 | .2 | --- |
  
  


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