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 comparisons chart for a B80 No. 5 unit after 30,000 miles, testing different exhaust configurations.
| Identifier | ExFiles\Box 125\3\ scan0135 | |
| Date | 29th June 1939 guessed | |
| 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 CARBURRETTER (SMALL) OPEN EXHAUST WITH 30 GVD BUICK SILENCER R.R.TAIL PIPE DIA. B.H.P. R.P.M. M.E.P. LBS/SQ' EX. BACK PRESS. INS HG. | ||