Performance graph for a B60 4 1/4 Litre engine with a 7.0:1 compression ratio.
| Identifier | ExFiles\Box 124\1\ scan0257 | |
| Date | 29th August 1939 guessed | |
| B60 POWER / 4 1/4 LTRE - 7.0:1 COMP RATIO CONDITIONS 2 - 1 1/2 SW CARBS FLUSH TOP PISTONS OPEN EXHAUST VALVE TIMING O3OCLCE IO 9° PTDC EO 30° BBDC IC 47° PBDC E 7° PTDC IN PLUG COMP PRESS'S BHP BHP. COMP. PRESS MEP MEP IGN. ADV. IGN. ADV. | ||
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).