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 comparing engine power curves for a Phantom II with an open exhaust and 5.25:1 compression ratio, testing two different camshaft and rocker setups.
| Identifier | ExFiles\Box 17\6\ Scan243 | |
| Date | 14th June 1934 | |
| POWER COMPARISONS (PHANTOM II) OPEN EXHAUST. 5.25:1. C.R. E.82448.CAMSHAFT .480 VALVE LIFT STANDARD ROCKERS. STD. SEMI-EXPANDING CARB. (NO INTAKE SILENCER) TIMING .020 CLCE IO 2° PTDC EO 49° BBDC IC 52° PBDC EC 6° PTDC E.80070.CAMSHAFT. .429 VALVE LIFT CADILLAC TYPE ROCKERS. LARGE SEMI-EXPANDING CARB. (NO INTAKE SILENCER) TIMING .020 CLCE IO 5° PTDC EO 54.5° BBDC IC 46° PBDC EC TOC. B.H.P. 160, 150, 140, 130, 120, 110, 100, 90, 80 IND'N DEPN Ins Hg. 4.0, 3.0, 2.0, 1.0 R.P.M. 0, 500, 1000, 1500, 2000, 2500, 3000, 3500 MEP(lbs/sq in) 100, 90, 80, 70, 60, 50 VALVES SEATING FULL POWER POWER DROP VALVE NOT SEATING | ||