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).
Comparative graph of Brake Mean Effective Pressure curves for various engines.
| Identifier | ExFiles\Box 124\3\ scan0312 | |
| Date | 15th February 1935 guessed | |
| G.M.C. CORRECTION TO 103 °F BRAKE MEAN EFFECTIVE PRESSURE CURVES CADILLAC & ROLLS-ROYCE PRODUCTS. Left Y-Axis Labels: B.M.E.P. LBS / SQ IN. DEGREES H.P. Right Y-Axis Labels: LB / FT. LB / H.P. HR. FUEL x 100 - AIR x 10 PER CENT (10) X-Axis Label: R.P.M. (÷ 100) Graph Labels: SIXTEEN DUPLEX CARB DOWNDRAUGHT 6.49 C/R BENTLEY SIXTEEN SINGLE UPDRAUGHT 6.49 C/R 20/25 R.R Main Table: TIMINGS .020 TAPPET CLEARANCE. DURATION INLET | EX CADILLAC V 12 | 204 | 206 CADILLAC V 16 | 197 | 196 LA{L. A. Archer} SALLE LINE 8 | 210 | 210 STANDARD 20/25 | 213 | 230 BENTLEY 3 1/2 LITRE | 234 | 238 TIMINGS EX O.{Mr Oldham} | EX C. | IN O.{Mr Oldham} | IN C. 25° B. | 1° A.{Mr Adams} | 15° A.{Mr Adams} | 39° A.{Mr Adams} 23° B. | 6° B. | 15° A.{Mr Adams} | 31° A.{Mr Adams} 30° B. | T.D.C. | 11 A.{Mr Adams} | 41° A.{Mr Adams} 44 B. | 6° A.{Mr Adams} | T.D.C. | 40.5 A.{Mr Adams} 47 B. | 11° A.{Mr Adams} | 1 B. | 52.5 A.{Mr Adams} Bottom Right Key (Vertical Text): ENGINE MOD & SERIAL N°, TEST DATE, POWER & ECONOMY OBJ CORR. B.M.E.P. CURVES CADILLAC 452 CU. IN. V-16 DUPLEX DOWNDRAFT CARBURETTERS - 6.49 C/R CADILLAC 452 CU. IN. V-16 STD. UPDRAFT CARBURETTERS - 6.49 C/R CADILLAC 368 CU. IN. V-12 STD. UPDRAFT CARBURETTERS - 5.55 C/R.{Sir Henry Royce} G.M.C. CORRECTION 60°F LA{L. A. Archer} SALLE 5.9 C.R. 240 CU. INS. 8 CYL. DUPLEX CARB LATEST S.U. CARB 20/25 5.8 C/R.{Sir Henry Royce} 222 CU. INS. BENTLEY 6.4 C/R.{Sir Henry Royce} DUPLEX CARB. 222 CU. INS. | ||