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 for a Phantom II engine with a twin carburettor, 110° camshaft, 4.9 compression ratio and open exhaust.
| Identifier | ExFiles\Box 13\2\ 02-page098 | |
| Date | 12th June 1930 guessed | |
| SHEET 4 P.II TWIN CARB 110° CAMSHAFT 4.9 C.R. OPEN EXHAUST B.H.P. 190 170 150 130 110 90 70 50 30 B.M.E.P. 130 120 110 100 90 80 70 60 A B C R.P.M. ENGINE. 500 1000 1500 2000 2500 3000 3500 | ||