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).
Engine, gearbox, and other component issues and investigations for the Wraith model.
| Identifier | ExFiles\Box 161a\2\ scan0160 | |
| Date | 2nd March 1938 | |
| WRAITH - 5 - 3. 26-G-VI (contd) was attributed more to the necessity of a modification to the front end mounting of the engine than to the crankshaft period. It was considered that the crankshaft period could be dismissed as being beyond reach, as it would only be in evidence at higher maximum revs than on the 25/30 h.p. engine. Hs{Lord Ernest Hives - Chair} was anxious to know what are the conditions in this respect different in the Wraith from the present 25/30 h.p. giving rise to the distributor drive failure. It was decided to carry out a comparative test for oscillation with Wraith and the 25/30 h.p. engine in pursuance of this investigation. The valve trouble was attributed to the settling of the valve seats in the cylinder head. Servo judders Rm{William Robotham - Chief Engineer} considers they have now found a complete cure for this, and explained in detail the causes which in his view have given rise to these judders in the past. He now considers that servo judders are finished with. Accelerator Pedal The thumps felt in the accelerator pedal were considered to be due to the engine mounting, but this is being further investigated. 4. Overdrive Gearbox for Wraith This matter was touched on because it was felt - at least by S. - that the introduction of the overdrive gearbox on P.III and Bentley will undoubtedly give rise to the question as to when we intend to bring this on to Wraith. It was felt that such a box when available should be tried on Wraith, and it was decided that when the B.III box is available - which will be interchangeable with Wraith and B.III chassis - such a box should be fitted to a Wraith for test purposes. 5. Lamp Under Bonnet It was decided to carry the standard Lucas inspection lamp in brackets under the bonnet on the offside, permanently wired up with a switch situated just above where the lamp is located. | ||