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).
Development progress on a vehicle's engine mounting, steering, clutch, exhaust system, and brakes.
| Identifier | ExFiles\Box 5\1\ 01-page142 | |
| Date | 31th March 1933 | |
| -2- ENGINE MOUNTING, CONTD. With a good carburetter intake silencer, we should be able to determine whether the booms are due to the exhaust system or to engine periods. Another feature in connection with the engine mounting is whether the clutch jaggers are anything to do with the way the engine is held, or whether they are simply a function of the clutch construction. We are not very interested in the clutch construction itself, because we have already a better design which is going to be fitted, but we should like to know whether the jaggers at present experienced are due to engine movement. STEERING. An axle has been detailed by the D.O. increasing the transverse inclination of the pivot pins from 1° to 4°. This we have already proved by fitting a 20/25 HP. axle to the car which greatly improves the steering. We should therefore urge the completion of this axle. CLUTCH. Though the internal arrangements of the clutch are going to be altered we can reproduce the correct pedal travel on the existing parts that are fitted. At present the pedal travel is too small and the allowance for wear unnecessarily large. Gry.{Shadwell Grylls} has the necessary particulars for lightening the pressure, and we should endeavour to get them fitted as soon as possible. EXHAUST SYSTEM. The exhaust system required on this car should be almost exactly similar to the standard 20/25 HP. as the lengths etc. are very similar. We should endeavour to get the 20/25. exhaust system fitted up to this car with a cut-out. At the first opportunity we can take our car down to the track and find out the actual losses in the exhaust system, and the maximum speed performance of the car. We can, of course, leave the cut-out to be operated by hand. It is not necessary to rig up controls. BRAKES. There is no reason whatever why the brakes should be inferior to those of the 20/25 HP. as the car is the same weight and the servo and brakes are also the same. We believe, from the feel of the car, the front equalizer shaft is not operating properly, or alternatively, the brake gear may be short of oil. | ||