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} | ||
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).