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 test results for car 1.EX with a 4-seater open touring body, comparing high and low compression engine configurations.
| Identifier | ExFiles\Box 183\M22\ img083 | |
| Date | 13th September 1922 guessed | |
| R Particulars of car 1.EX - 4-seater open touring body - windscreen and hood - all accessories - weight complete 46¼ cwts. during tests. 15 X 52 axle ratio. Tests were taken to prove that ignition and mixture were set to give the best results. TESTS | | High compression. 23¾ cu.ins. Exhaust cut-out. | | Low compression. 26 cu.ins. Exhaust cut-out. | | |---|---|---|---|---| | | Open. | closed. | Open. | closed. | | Max. speed for one lap. | m.p.h. 69.66 | m.p.h. 66.85 | m.p.h. 68.76 | m.p.h. 64.8 | | Max. speed for ¼ mile. | 69.23 | 66 | 67.67 | 66.7 | | Acceleration. | secs. | secs. | secs. | secs. | | 10 m.p.h. to 65 m.p.h. | 44¾ | 58 | 50 | | | 20 " " 65 m.p.h. | 41¾ | 53¼ | 47 | | | 30 " " 65 m.p.h. | 37¾ | 46¼ | 35 | | | 40 " " 65 m.p.h. | 31¾ | 35 | 34 | | | 10 " " 60 " | 33¾ | 37¼ | 37 | 41 | | 20 " " 60 " | 29¾ | 32 | 32 | 37 | | 30 " " 60 " | 25 | 26¾ | 29. | 32 | | 40 " " 60 " | 18¾ | 21¾ | 22 | 24 | | 10 " " 50 " | 23 | 25 | 24¾ | 26 | | 20 " " 50 " | 18 | 20 | 20 | 25 | | 30 " " 50 " | 14 | 14 | 17 | 19 | | 40 " " 50 " | 7¾ | 8 | 10 | 11¾ | | ¼ mile acceleration test | | | | | | starting at 10 m.p.h. | 41¾ | 43 | 46 | 48¼ | | 20 " " | 39 | 40 | 40¾ | 43 | | 30 " " | 36 | 37 | 39 | 40 | | ||