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).
Summary of a discussion on potential design improvements for a Bentley vehicle, specifically Halford tappets and rubber engine mounting.
| Identifier | ExFiles\Box 3\6\ 06-page209 | |
| Date | 2nd July 1934 | |
| x453 To E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}16/KW.2.7.34. Bentley Design Work. Confirming the talk round the Bentley between Hs.{Lord Ernest Hives - Chair}, E.{Mr Elliott - Chief Engineer}, Lid.{A. J. Lidsey}, and Rm.{William Robotham - Chief Engineer} the following is a summary of the points raised :- (1) Features which could quickly be got on the standard car if designs were available, and would immediately be appreciated by customers. Development work in every case has provided sufficient data for designs to be made :- (a) Complete scheme for Halford tappets, to include lighter inlet and exhaust valves, oil feed having two stages of pressure, and a filter. We suggest that whilst the valve gear is under consideration the tappet might be re-designed. The attached sketch indicates one way of doing this. With the Halford tappets and the present standard valve springs, bounce takes place at about 4150 r.p.m. (b) Rubber Engine Mounting. You have given us the rear mounting. We require cantilever pedals and a new link scheme, also cantilever controls. Both these have been fitted up on experimental car B-23-AE. If the engine torque could be taken further forward, approximately where the present torque reaction dampers are, it would be a further improvement. There is no doubt that on the present standard Bentley there is a considerable amount of boom on the over-run, particularly in the rear seats, and we have had a definite expression of opinion by a customer that this spoils an otherwise delightful motor-car. The rubber engine mounting will almost completely cure this. | ||