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 showing power loss to standard exhaust manifolds for the Phantom engine.
| Identifier | WestWitteringFiles\R\2December1927-February1928\ Scan014 | |
| Date | 28th November 1927 | |
| POWER LOSS TO STANDARD EXHAUST MANIFOLDS (PHANTOM). ENGINE R.E. 25 COMPRESSION RATIO 4.12 LONG DURATION INLET CAM STANDARD INDUCTION SYSTEM STANDARD TWO BRANCH EXHAUST SYSTEM. BRAKE HORSE POWER RPM OF ENGINE CURVES. ① OPEN EXHAUST. ② MANIFOLDS + FRONT SILENCER. ③ COMPLETE SYSTEM (CUTOUT OPEN) ④ " " (CUTOUT SHUT) THESE CURVES ARE CORRECTED TO N.T.P. ACTUAL AVERAGE AIR TEMP (CURVE ④) = 20.6°C. V177 28-11-27 | ||