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 camshaft configurations.
| Identifier | ExFiles\Box 13\2\ 02-page015 | |
| 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. RPM. of Engine. 116° Camshaft. 110° Camshaft (Nozzle fitted in Indn Pipe). Probable Curve with Nozzle Removed (110°). Valve Timings. (.020 Tappet Clearance). 116° Camshaft: Inlet Opens: 21° after TDC Inlet Closes: 45° after BDC Exhaust Opens: 36° before BDC Exhaust Closes: at TDC. 110° Camshaft: Inlet Opens: 14° after TDC Inlet Closes: 34° after BDC Exhaust Opens: 34° before BDC Exhaust Closes: 2° after TDC | ||