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).
List of modifications for the 3 1/2 Litre Bentley car after running 10,000 miles.
| Identifier | ExFiles\Box 3\6\ 06-page035 | |
| Date | 13th September 1933 | |
| Hs.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} RHC.{R. H. Coverley - Production Engineer} Sftr. or Worr. Rm{William Robotham - Chief Engineer} 3 1/2 LITRE BENTLEY. With regard to the discussion in Hs{Lord Ernest Hives - Chair}'s. Office settling up what was required on the 15 Bentleys, it was decided that the following modifications were necessary on the Bentley car running the 10,000 miles. (1). Radiator and Front Apron. The present type of front apron is to be used, but the latest type of radiator having thermostatically controlled shutters is to replace the form with a grid and the thermostat by-pass in the water system from the engine to the radiator. With the shutters a special starting handle is to be used by which both the shaft and the handle are loose instead of the shaft being carried in position. (2). Fan. 20 HP. type of fan with rounded tips to the blades. (Handwritten: Now alter to Chrysler type) (3). Camshaft. The modified driving wheel with balancing cam arranged on the hub is to be fitted. (4). Cylinder Blocks. The type of cylinder blocks with shortened snout to conform with the original 20/25 length is to be used. (5). Pistons. The new form of piston made to EB.495 with standard 20/25 clearances, but ground to EB.500 as modified by EX.11480. (6). Crankshaft. The new scheme for balance weights is to be introduced by which two studs are used for the larger type of balance weight and one stud for the smaller type. In addition, new studs having collars where they abut on the top of the crankshaft web are required. 12 bolts are required for securing the flywheel to the crankshaft. | ||