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).
Comparative lap speed and RPM tests between a 3½ Litre Jaguar and a 4¼ Litre Bentley.
| Identifier | ExFiles\Box 126\5\ scan0043 | |
| Date | 28th March 1938 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FD{Frank Dodd - Bodies}, Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies}9/MH.{M. Huckerby}28.3.38. 3½ LITRE JAGUAR. This car was tested at Brooklands on Monday and the following lap speeds were taken, together with comparative tests on a 4¼ litre Bentley, these were as follows :- | | 3½ L Jaguar. | 6.B.4 4¼ L Bentley. Direct Gear. | 4¼ L Bentley overdrive. | |---|---|---|---| | LAP SPEED | 84.81 mph. | 84.27 mph. | 85.28 mph. | Jaguar maximum RPM reached 4,300 i.e. 93 mph. on speedo. 86.85 corrected speed. 6.B.IV maximum RPM reached 4,250 in direct i.e. 92 mph. speedo. 87.4 corrected. 6.B.IV maximum RPM reached in overdrive 3,650 i.e. 94 mph. speedo. 89.3 corrected. | ||