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 a 3.9-litre 6-cylinder engine with a single-cylinder engine test, showing B.H.P and B.M.E.P against R.P.M.
| Identifier | ExFiles\Box 133\1\ scan0025 | |
| Date | 7th February 1930 | |
| CURVE OF 3.9 LITRE BONTLY? MULTICYL. ENGINE C.R. 5.45/1 TWO 42 M/M ZENITH TRIPLE VENTURI CARBS 34 CHOKES SHELL N°1 PETROL HIGH POWER HEAD 85 x 115 M/M 6 CYLS. 3.9 LITRES SINGLE CYL. ENGINE 48 H.K. ZENITH CARBR 39 CHOKE C.R. 5.5/1 DOTTED CURVE SINGLE CYL. CURVE OBTAINED ON 7/FEB/30 & LATER REPORTED TO HAVE BEEN BEATEN B.H.P B.M.E.P R.P.M. B.M.E.P. (SINGLE CYL) BMEP (6 CYL) B.H.P. | ||