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 Brake Horse Power against RPM for an engine with various exhaust system configurations.
| Identifier | ExFiles\Box 92\2\ scan0062 | |
| Date | 9th January 1930 | |
| 9-1-30 V765. POWER LOSS TO EXHAUST SYSTEM (S.S.) EXHAUST SYSTEM TO N.SCH. 2931/2/47, HAVING CAST ALUMINIUM EXPANSION BOX & SILENCER ENDS. ENGINE N°SS{S. Smith}-15 (STANDARD) (3.0" MANIFOLD PIPE.) CURVES CORRECTED TO N.T.P OPEN EXHAUST SWAN NECK & MAIN SILENCER REMOVED. SWAN NECK REMOVED. COMPLETE SYSTEM CUT-OUT CLOSED CUT-OUT OPEN. BRAKE HORSE POWER 140 120 100 80 60 40 R.P.M. OF ENGINE. 500 1000 1500 2000 2500 3000 HHA | ||