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).
General report on the preliminary examination and test work for the 9.B.V. Bentley.
| Identifier | ExFiles\Box 98\4\ scan0034 | |
| Date | 21th December 1938 | |
| WYMAN (crossed out) SWDL{Len H. Swindell} HOOD To Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} c. to All Testers. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}15/JH.21.12.38. 9.B.V. Bentley. Released for test 6.12.38. General report on preliminary examination and test work. ................ Engine No.4 Unit. The engine is rough above 2,500 r.p.m. particularly on overrun becoming progressively worse up to 3,500 r.p.m. Removing the rear torque rubbers effected an improvement but allowed too much engine movement at low speed torque. High torque rubbers behind the gearbox as on 8.B.V. are to be tried. The latest induction pipe and carburetters have been fitted after development and setting of the starting carburetter on the rig. These have been submitted to a cold starting test, by Rm.{William Robotham - Chief Engineer} The engine is generally noisy when first started from very cold. Handwritten note: SWDL{Len H. Swindell} This should be confirmed on the rig engine + moves made to eliminate Clutch. This is a standard Borg & Beck. Rattles occasionally occur on engagement. The servo spring on the pedal has been retained with this clutch, and appears satisfactory except for a foul on the bracket in the off position. A Long centrifugal clutch with ordinary pull off spring in place of servo spring is called for for production. Gearbox. This is the new box with detachable servo. Springs of the leaf type have been incorporated in the direct and overdrive sliding piece. There are no springs in the second gear sliding piece, although these were fitted to 8.B.V. The direct and overdrive synchromesh is light and positive, and generally satisfactory. The final design scheme for springs in the sliding piece is therefore awaited. The change into first and second gears is lighter and smoother than 8.B.V. and generally preferable Cont'd.{John DeLooze - Company Secretary} | ||