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).
Graph plotting Brake Horse Power against engine RPM for a Phantom engine to show the power loss with different exhaust manifold setups.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan016 | |
| Date | 30th November 1926 | |
| POWER LOSS TO MODIFIED SINGLE EXHT MANIFOLD (PHANTOM) ENGINE RE 25 COMPRESSION RATIO = 4.12 LONG DURATION INLET CAM STANDARD INDUCTION SYSTEM EXHAUST MANIFOLD TO L.C. 2432/6/7 BUT MODIFIED TO V182. CURVES. ① OPEN EXHAUST. ② SINGLE OUTLET MANIFOLD TO L.eC. 2432/6/7 MODIFIED TO V182 + FRONT SILENCER. ③ UNMODIFIED SINGLE MANIFOLD + FRONT SILENCER. BRAKE HORSE POWER R.P.M. OF ENGINE. | ||