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 of power comparisons for a B80 N°5 unit after 30,000 miles, plotting BHP, MEP and back pressure against RPM.
| Identifier | ExFiles\Box 109\4\ scan0123 | |
| Date | 5th July 1939 guessed | |
| POWER COMPARISONS ON B 80 N°5 UNIT. (30,000 MILES) CONDITIONS VALVE TIMING .030 CLCE IO 11° PTDC. EO 40° BBDC IC 30° PBDC. EC 1° BTDC EB 4512 CAMSHAFT ORIGINAL TYPE CYL. HEAD EB 4098 - 6.25:1 COMP. RATIO NO AIR SILENCER OR FAN 1.75 BORE INDN. SYSTEM WITH DWPLGX DOWN DRAUGHT STROMBERG CARBURETTER (SMALL) OPEN EXHAUST WITH 30 G VII BUICK SILENCER R.R. TAIL PIPE DIA. B.H.P M.E.P. LBS/SQ" EX. BACK PRESS. INS HG. R.P.M. | ||