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).
The performance and testing of various engine and chassis components.
| Identifier | ExFiles\Box 5a\2\ 02-page343 | |
| Date | 18th December 1930 guessed | |
| [Handwritten in left margin]: K 6020-f -4- OIL SUMP INDICATOR to LOP. E.50280 - LsC 2756/?. The indicator has given the oil level correctly and no trouble has been experienced with its mechanism. FAN to LOP E.53250 USING DUNLOP RUBBER FAN BELT. The fan does not show any weakness or failure at this mileage. The rubber fan belt has maintained its driving power and has stretched very little. There is no noticeable period from the fan. The belt when driving at high speeds expands outwards and fouls the engine gears and the dynamo drive. We have reported this feature to by.{R.W. Bailey - Chief Engineer} as it is not a standard fitting but is incorporated in the new design of the dynamo drive. [Handwritten note]: x the junction of the oil pipe supplying LOW INERTIA SPRING DRIVE: LOP E.54743 - Scheme 1334. (1) Using Double Driving Springs and stronger damper springs, viz:- E.56167 Outer Driving Springs. E.56200 Inner " E.56208 Damper Springs. (2) Spring Plate machined with windows to Drg: Ex.8217. (3) Damping Friction 8 lbs. 17 1/2" rad. (& damping springs E.56208 removed) (4) Driving Spring load - 9 3/4 lbs. at 17 1/2" rad. There has been no audible bus knocks, thumps, timing gear, rattles; or crankshaft periods during the present mileage. The above friction load was obtained by taking out 3 damping springs. This means that new springs will have to be designed to give the above load with a full complement of springs. We had, previous to the alteration of the damping load, bus knocks. We have not at this mileage disturbed the setting. IGNITION WIRES to LOP. E.53004. ALUM. TUBE E.56158 CARRYING H.T. WIRES CU 1321. We consider that this tube and the spacing of the wires is much neater and a definite improvement than the present standard. There is no sign of deterioration of the ignition wires. We would suggest a further improvement by making the top Bakelite support in black to conform with the black alum. tube. TORQUE REACTION DAMPERS to V.53049. USING OIL SOAKED CORK OR DARK FRICTION DISCS. To obtain the best compromise from torque reaction and booms, these dampers have been set to give a friction load of 2.5 lbs. in conjunction with the setting of the diablo rubber engine mounting. | ||