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 analysis of power losses due to the latest exhaust system.
| Identifier | ExFiles\Box 66\2\ scan0016 | |
| Date | 10th February 1925 | |
| R.R. 493A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -1- Expl. No. REF:Hs{Lord Ernest Hives - Chair}/ACL/LG10.2.25. ANALYSIS OF POWER LOSSES DUE TO LATEST EXHAUST SYSTEM. LeC.1956. The following experiments were made to determine the power losses due to the whole and various components of the exhaust system. The power output of the engine was measured in the following order :- (1) With the complete system cutout closed. (2) " " " " open. (3) Cutout closed and swan neck removed. (4) Silencer removed and end of intermediate pipe stopped up. (5) Intermediate pipe removed from joint at front expansion chamber. (6) Front expansion chamber removed leaving only the manifold and down pipes. (7) Manifold removed. No heat to the hot spot could be used with the mani-fold removed so a further experiment was made to determine the power loss due to the heating of the charge by the hot spot. A correction was then made, from the figures obtained by this experiment, to the power curve No.7. The following curves are supplied :- No.1. Power output with various parts of the exhaust system. No.2. Power loss due to various parts. No.3. Correction curve. Power loss due to 'hot spot'. A table is also supplied for the seven power curves taken. With the cutout open, the system appears to be contd :- | ||