Graph of power comparisons on a B80 N°5 unit engine after 30,000 miles, testing an open exhaust against a Buick silencer.
| Identifier | ExFiles\Box 124\1\ scan0181 | |
| Date | 30th June 1939 guessed | |
| POWER COMPARISONS ON B80 N°5 UNIT. (30,000 MILES) S.94 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 G VII BUICK SILENCER R.R. TAIL PIPE. DIA. B.H.P. R.P.M. M.E.P. LBS/SQ" EX. BACK PRESS INS. HG. | ||
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).