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 comparing engine power output (BHP & MEP) at various RPMs for the B80 No. 5 unit, with open exhaust versus a silencer.
| Identifier | ExFiles\Box 109\4\ scan0108 | |
| Date | 1st September 1942 | |
| POWER COMPARISONS ON B80 N°5 UNIT. (30,000 MILES) CONDITIONS VALVE TIMING .030 CLCE. IO 11° PTDC EO 40° BBDC EB 4512 CAMSHAFT. IC 30° PBDC EC 1° BTDC 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 GVII BUICK SILENCER R.R. TAIL PIPE DIA. B.H.P R.P.M. M.E.P. LBS/SQ" EX. BACK PRESS. INS. HG. | ||