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 high power head against a standard Bentley head for the same detonation intensity.
| Identifier | ExFiles\Box 134\2\ scan0120 | |
| Date | 20th August 1937 guessed | |
| COMPARISON OF HIGH POWER HEAD (No 2) AND STANDARD BENTLEY FOR THE SAME DETN. INTENSITY. IGNITION ADVANCE B.M.E.P. STANDARD BENTLEY (6" DETN) No. 2 HIGH POWER (6" DETN) No. 2 HIGH POWER (MAX. POWER) No. 2 HIGH POWER HEAD (MAX POWER) No. 2 HIGH POWER HEAD (6" DETN) STD. BENTLEY - 6" DETN | ||