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).
Performance graph comparing B.M.E.P. and B.HP for single and 6-cylinder engines.
| Identifier | ExFiles\Box 182\M19\ img283 | |
| Date | 7th February 1930 | |
| 85 x 115 M/M 6 CYLS. 3.9 LITRES SINGLE CYL. ENGINE 48 H.K ZENITH CARB. 39 CHOKE C.R 5.5/1 B.M.E.P. (SINGLE CYL) B.M.E.P. (6 CYL) B.H.P R.P.M. ON 7/FEB/30 EN BEATEN | ||