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 comparing brake horsepower against engine RPM for various exhaust system configurations.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan039 | |
| 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. BRAKE HORSE POWER. 140 120 100 80 60 40 R.P.M. OF ENGINE. 500 1000 1500 2000 2500 3000 OPEN EXHAUST SWAN NECK & MAIN SILENCER REMOVED. SWAN NECK REMOVED. COMPLETE SYSTEM CUT-OUT CLOSED CUT-OUT OPEN. | ||