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).
Power curve graph for a Super Sports Engine comparing different camshafts and nozzle configurations.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan075 | |
| Date | 19th September 1928 | |
| V423 POWER CURVE WITH 116° CAMSHAFT. SUPER SPORTS ENGINE N° SS{S. Smith}-3. COMP. RATIO = 4.5 CLAUDEL HOBSON CARBURETTOR HOT SPOT IN ACTION (WATER AT 75°C) OPEN EXHAUST. 116° CAMSHAFT TO E77322. (N.B. NOZZLE E77799 REMOVED FROM INDUCTION PIPE). BRAKE HORSE POWER. R.P.M. OF ENGINE. 110° CAMSHAFT (NOZZLE FITTED IN INDN PIPE). PROBABLE CURVE WITH NOZZLE REMOVED (110°). 116° CAMSHAFT. VALVE TIMINGS. (.020 TAPPET CLEARANCE). | | 116° CAMSHAFT | 110° CAMSHAFT | |---|---|---| | INLET OPENS. | 21° AFTER TDC | 14° AFTER TDC | | INLET CLOSES. | 45° AFTER BDC | 34° AFTER BDC | | EXHAUST OPENS. | 36° BEFORE BDC | 34° BEFORE BDC | | EXHAUST CLOSES. | AT TDC. | 2° AFTER TDC | | ||