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 showing the valve lift curves for the Kestrel Harmonic Camshaft.
| Identifier | ExFiles\Box 179b\3\ img183 | |
| Date | 10th February 1933 guessed | |
| VALVE LIFT [INS x 10³] CAMSHAFT DEGREES KESTREL HARMONIC CAMSHAFT DES. 1734 LIFT CURVES [TAPPETS .020" CLEARANCE] INLET DES. 1734 EXHAUST INLET LIFT .5193 EXH LIFT .522 EXH LIFT .528" INLET PEAK 60.6 PEAK 66° EXH PEAK 68.2° INLET CLOSES 127° EXH CLOSES 131.3 CLOSE 132° | ||