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 of power output against RPM for a 20-HP engine with various exhaust system configurations.
| Identifier | ExFiles\Box 19\7\ Scan086 | |
| Date | 1st May 1926 | |
| 20-HP. ENGINE - POWER OUTPUT WITH VARIOUS PARTS OF THE EXHAUST SYSTEM STD ENGINE 4.75/1 COMPn RATIO. BAR 758 M.M. TEMP. 19°C (AIR) B.H.P. R.P.M. SHORT OPEN EXH. PIPES MANIFOLD WITH OPEN END EXHAUST PIPE EXPL. MANIFOLD WITH OPEN END EXH. PIPE COMPLETE SYSTEM MINUS SWAN NECK COMPLETE SILENCER MANIFOLD LOSS RELATIVE TO FREE EXHAUST. STANDARD EXPERIMENTAL Alfo / 1/5/26 | ||