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 comparing high and low compression engine configurations with open and closed exhaust cut-outs.
| Identifier | WestWitteringFiles\I\August1922\ Scan1 | |
| Date | 9th August 1922 | |
| Hs{Lord Ernest Hives - Chair}2/LG9.8.22. Particulars of car 1.EX - 4-seater open touring body - windscreen and hood - all accessories - weight complete 46¾ cwts. during tests. 14 X 52 axle ratio. Tests were taken to prove that ignition and mixture were set to give the best results. High compression. Low compression. TESTS. 23¾ cu. ins. 26 cu. ins. Exhaust cut-out. Exhaust cut-out. Open. closed. Open. closed. Max. speed for one lap. m.p.h. m.p.h. m.p.h. m.p.h. 71.4 65.5 69.4 65.74 Max. speed for ½ mile. 67.4 63.5 65.22 62.7 Acceleration. secs. secs. secs. secs. 10 m.p.h. to 65 m.p.h. 37¾ 50 47 Impossible 20 " " 65 " 34 46½ 41 to 30 " " 65 " 29 35 38 get 40 " " 65 " 26½ 32 32½ 10 " " 60 " 30 37 34 42½ secs. 20 " " 60 " 27 31 32 36 " 30 " " 60 " 21 25 28 32 " 40 " " 60 " 17 19 20½ 23 " 10 " " 50 " 21 23½ 23 25 " 20 " " 50 " 17 19 20 22½ " 30 " " 50 " 12 14 15 17 " 40 " " 50 " 7 7½ 8½ 10½ " ½ mile acceleration test. starting at 10 m.p.h. 40 43 45 47½ " 20 " 36 37 38½ 40 " 30 " 33 33 36 37 " Hs.{Lord Ernest Hives - Chair} | ||