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).
Technical report page discussing engine mounting results and solutions for various component rattles and movements.
| Identifier | ExFiles\Box 86\5\ scan0113 | |
| Date | 14th May 1934 | |
| -2- (5) The carburetter controls at present have one end of the shaft attached to the frame and the other end to the engine. When idling, small movements of the engine tend to open and close the throttle. We have cantilevered this control shaft off the crankcase which has overcome the trouble. (6) To avoid the silencer second expansion box touching the frame, we have stayed this to the gearbox. More flexibility is really required on the silencer suspension to deal with the increased engine movement. (7) The water connections require the same treatment as on the 20/25. (8) Front Brake Equaliser Shaft Rattles. Clearance is left in this shaft endways to prevent it tightening up when the gearbox gets hot. This shaft now rattles under the increased engine movement, and requires spring loading or otherwise restraining. We are very pleased with the final result of this engine mounting, as it takes out a great deal of the over-run booms which are present in most Bentleys. As soon as these booms disappear, all other noises are emphasized, in particular tappet noise, gear lever rattles, and rattles in the transmission. We have a set of Halford tappets about to be completed to deal with (1), and a propeller shaft damper to deal with (3). We are considering whether a finger operated reserve catch on the gate itself would not be the best solution to (2), the gear lever rattle problem. We will fit the car up with this scheme for general consideration. The parts tested for which designs are now required are front and rear engine mounting, cantilever pedals, throttle controls cantilevered from the crankcase, improved head lamp support rigidity, spring loaded equaliser shaft, improved exhaust system suspension. Will E.{Mr Elliott - Chief Engineer} please deal with these at the earliest opportunity. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||