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 power output (BHP) and BMEP of five different engine configurations against engine speed (RPM).
| Identifier | ExFiles\Box 4\1\ 01-page005 | |
| Date | 1st October 1932 guessed | |
| POWER COMPARISONS (OPEN EXHAUST) ① STD PHANTOM II - 7668CC ② CONTINENTAL PII (R.R. SEMI EXP CARB. R=5.25:1) 7668CC ③ CONTINENTAL PII (THIN S.U. CARBS. R=5.25:1) 7668CC ④ 12 CYL 3 ¼ x 4 ½ J.I. ENGINE (THIN S.U CARBS R=6:31) 6252cc. ⑤ 12 CYL 3.25x4.5 J.S ENGINE ('J2' CAMSHAFT) 7338cc B.H.P. (FLYWHEEL) ENGINE R.P.M. B.M.E.P. (LBS/SQ IN) | ||