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).
Summary of existing camshafts for various engine models showing their timing and duration.
| Identifier | ExFiles\Box 13\2\ 02-page163 | |
| Date | 18th April 1932 | |
| SHEET 1 ALL DURATIONS ACTUALLY BY TEST BED MEASUREMENT SUMMARY OF EXISTING CAMSHAFTS P I J II 25 H.P ALFA ROMEO 27 TO 8 INLET 233 EXHAUST 230.8 DIAGRAM 1: IN 40, EX 55.5, .020 CLCE 112° EXP. CAMSHAFT W.W. E.57177 TWO EXHAUST CAMS D.35 INLET 229 EXHAUST 233.5 DIAGRAM 2: IN 50, EX 49, .020 118.5° W.W. E.57177 FOR CHINA INLET = 213.5 EXHAUST = 230 DIAGRAM 3: IN 44, EX 40.5, .020 J III SHAFT INLET DURN = 213 EXHAUST DURN = 228.2 DIAGRAM 4: IN 41.2, EX 40, .020 114° PII 22.75 E.87448 INLET 230 EXHAUST 236 DIAGRAM 5: IN 49, EX 52, .020 OLD STANDARD PII 116° 22 12 6 INLET 213.6 EXHAUST 228 DIAGRAM 6: IN 50, EX 46.1, .020 R ENGINE CAMS 110° SHAFT 17 18 6 INLET 256.5 EXHAUST 254 DIAGRAM 7: IN 56, EX 53.5, .020 | ||