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 Horse Power vs RPM for a standard exhaust system and a single outlet exhaust manifold with the cutout open.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 157 | |
| Date | 21th November 1927 guessed | |
| V171 SINGLE OUTLET EXHAUST MANIFOLD TO Le C. 2432/6/7 (Two Sheets) SHEET II : CUTOUT OPEN. FOR CONDITIONS SEE SHEET I BRAKE - HORSE - POWER STANDARD EXHAUST SYSTEM Le C. 2432/6/7 NOTE: WITH CUTOUT OPEN ON THE SINGLE OUTLET SCHEME, THE POWER IS NOT MATERIALLY AFFECTED BY OPENING THE HOT SPOT VALVE. R.P.M. OF ENGINE 120, 110, 100, 90, 80, 70, 60, 50, 40, 30 500, 1000, 1500, 2000, 2500, 3000 | ||