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).
Graph of B.M.E.P. versus R.P.M. for a cylinder head, with a diagram of the head's chambers.
| Identifier | ExFiles\Box 179b\3\ img160 | |
| Date | 28th January 1933 guessed | |
| B.M.E.P. 110 100 90 80 70 60 50 40 30 20 SWAN NECK REAR CHAMBER FRONT CHAMBER 5 THIS CYL: HEAD HAD NOT BEEN TREPANNED ROUND THE INLET VALVE R.P.M. 500 1000 1500 2000 2500 3000 3500 4000 4500 C.T.S. 93 88 | ||