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, a 4-seater open touring body, under various engine and exhaust configurations.
| Identifier | ExFiles\Box 29\3\ Scan104 | |
| Date | 13th September 1922 guessed | |
| Particulars of car 1.EX - 4-seater open touring body - windscreen and hood - all accessories - weight complete 46½ 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. 23¼ cu.ins. Exhaust cut-out. Open. closed. Low compression. 26 cu.ins. Exhaust cutout. Open. closed. Max. speed for one lap. m.p.h. 69.66 m.p.h. 68.85 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. 44½ 58 50 20 " " 65 " 41½ 53½ 47 30 " " 65 " 37¾ 46½ 35 40 " " 65 " 31¼ 35 34 10 " " 60 " 33¼ 37½ 37 41 20 " " 60 " 29½ 32 32 37 30 " " 60 " 25 26½ 29 32 40 " " 60 " 18½ 21½ 22 26 10 " " 50 " 23 25 24½ 26 20 " " 50 " 18 20 20 25 30 " " 50 " 14 14 17 19 40 " " 50 " 7½ 8 10 11½ ¼ mile acceleration test starting at 10 m.p.h. 41½ 43 46 48½ 20 " 39 40 40½ 43 30 " 36 37 39 40 Hs.{Lord Ernest Hives - Chair} | ||