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).
Questioning the new throttle stop arrangement on Large Bore Bentley carburettors.
| Identifier | ExFiles\Box 85\4\ scan0155 | |
| Date | 7th February 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} X208 Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}5/KW.7.2.36. Large Bore Bentley. We cannot understand why the throttle stop of the carburetters is now fixed on the front carburetter and not on the rear, as was the case with the 3 1/2 litre Bentley. The latter is the correct principle, whereby the stop on the rear carburetter is adjustable by the screw for idling speed, and the front carburetter to which the return spring is attached is adjustable by the worm and screw device to match the running of the rear carburetter; the spring taking up any slack in the couplings. All the large bore Bentleys now being produced in the Works are arranged with the throttle stop on the front carburetters. This scheme appears to have the following disadvantages without any advantage :- (1) With the stop and the spring on the front, the coupling slack is not accounted for. (2) In order to adjust the idling of the rear carburetter it is necessary to uncouple the control rod. (3) The tendency of the operation of the control is to twist the throttle of the rear non stopped carburetter about the front stopped carburetter, causing uneven throttle opening. Hs{Lord Ernest Hives - Chair}/L.H.Swindall. | ||