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).
Power comparison chart plotting HP and B.M.E.P. against R.P.M. for various engines.
| Identifier | ExFiles\Box 4\1\ 01-page011 | |
| Date | 24th October 1932 guessed | |
| POWER COMPARISONS (OPEN EXHAUST) (1) STANDARD PHANTOM II - 7668 C.C. (2) CONTINENTAL PH II (RR S.U. 6-1" CARB-R-5251) - 7668 C.C. (3) CONTINENTAL PH II (TWIN S.U. CARBS-R-525-1) - 7668 C.C. (1 1/2" CARBURET - 3252 C.C.) (4) 12 CYL - 3 1/4 x 4.5 JI ENGINE (TWIN S.U. CARBS-R-631) (1 1/2" CARBURET - 7338 C.C.) (5) 12 CYL - 3 1/4 x 4.5 JI ENGINE (TWIN S.U. CARBS-R-631-1) (1 1/2" CARBURET - 7338 C.C.) Y-AXIS LEFT: H.P. (FLYWHEEL) X-AXIS: ENGINE R.P.M. Y-AXIS RIGHT: B.M.E.P. (LBS/SQ. IN) GRAPH LABELS: MARMON (16), CADILLAC (16), AUBURN (12), PACKARD (12), LINCOLN (12), CADILLAC (12), MAYBACH (12), MINERVOM(K). | ||