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).
Performance graph comparing the best results achieved with two different camshaft configurations.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page043 | |
| Date | 14th July 1932 guessed | |
| COMPARISON OF BEST RESULTS WITH TWO CAMSHAFTS. ① TWO INLET CAMS 104° BETWEEN THEM. INLET THROAT 1.200 OPEN EXHAUST. ② INLET AND EXHAUST CAM 105.5°. INLET THROAT & EXHAUST 1.125. 1 5/8 THROTTLE DIA S.U. 5.85 C/R.{Sir Henry Royce} PLUG REACH .950 ALL CURVES TAKEN RUNNING WITH .020 TAPPET CLEARANCE. LOW SPEED M.E.P. INCREASES APPROX. 2 LBS/sq" WHEN HOT SPOT FITTED. Left Y-Axis: B.H.P. Right Y-Axis: B.M.E.P. LBS./sq." Diagram ①: EX 38, IN 29, 2 12, .020 CLCE Diagram ②: EX 40, IN 31, 1 17, .020 CLCE | ||