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 the power loss to standard exhaust manifolds for a Phantom engine.
| Identifier | ExFiles\Box 66\2\ scan0305 | |
| Date | 28th November 1927 | |
| POWER LOSS TO STANDARD EXHAUST MANIFOLDS (PHANTOM). ENGINE R.F. 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. | ||