Performance graph comparing standard and experimental camshafts for a Goshawk II engine, showing Brake Horsepower (BHP) against Revolutions Per Minute (RPM).
| Identifier | WestWitteringFiles\K\October1923\ Scan25 | |
| Date | 12th July 1923 guessed | |
| GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)) II STANDARD AND EXPERIMENTAL CAMSHAFT. ENGINE 8 GII. 45° VALVE SEATS. BATTERY IGNITION. ENGINE WATER AT 80°C. SILENCER FITTED. BOTH CURVES OBTAINED UNDER THE SAME CONDITIONS. B H P R P M STANDARD CAMSHAFT EXPERIMENTAL CAMSHAFT VALVE TIMING WITH STANDARD CAMSHAFT IS AN AVERAGE OF PRESENT PRODUCTION PRACTICE. INLET DIAGRAM: I.O. 10°, I.C. 50° EXHAUST DIAGRAM: E.C. 5°, E.O. 48° INLET EXHAUST EXPERIMENTAL CAMSHAFT HAS STANDARD CAM CONTOUR BUT THE EXHAUST CAM LEADS ITS INLET CAM BY 110° AS COMPARED WITH 118° ON THE STANDARD CAMSHAFT. BEST TIMING WITH THIS CAMSHAFT. INLET DIAGRAM: I.O. 10°, I.C. 38° EXHAUST DIAGRAM: E.C. 3°, E.O. 44° INLET EXHAUST | ||
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).