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 modifications of carburettors, spring drive damper, and flywheel/clutch components.
| Identifier | ExFiles\Box 82\2\ scan0105 | |
| Date | 24th July 1934 guessed | |
| - 2 - CARBURETTORS LOP. EB.200 S.U. Treated for non-corrosive. LRC. 3947 scheme to prevent flooding and drain pipes to prevent fire in case of flooding. There has been no flooding of the carburetters up to this mileage. The front drain pipe to the float chamber broke close to banjo after 1,260 miles. The cause was due to the vibration of the pipe. This could be prevented by a clip holding the two drain pipes together between the carburetters. No corrosion of metal has taken place. SPRING DRIVE DAMPER LOP. EB.129. FITTED WITH FEROBESTOS FRICTION WASHERS. The maximum friction load of 14lbs. was not sufficient to damp out the half-crankshaft period, which also affected the period at 3750. The load could not be increased owing to the low poundage of the springs. The Ferobestos washers have been replaced by standard cotton duck and with a higher coefficient. The damper load has been raised to 19 lbs. at 7 1/2 R.A.D. This has damped out the two periods. FLY WHEEL AND CLUTCH LOP. GB.1173. HS.{Lord Ernest Hives - Chair}3948. GL.{G. Linnett}710. Lightened fly-wheel and increased friction surfaces to HS.{Lord Ernest Hives - Chair}3948. external adjustment. Fly-wheel modified to HS.{Lord Ernest Hives - Chair}1416. EX.14659 Friction plate staggered .015 set. EX.14191 VH. material friction linings. EX.14194 Pressure ring. EX.13830 Friction plate. Tubular rivets used to secure linings to plates. No wear of the material can be measured .005" float on Back Plate. The clutch has been free from jaggers when engaged, using second gear. It has been free from transmission rattles. It started to slip and had to be used carefully towards the finish in getting through the London traffic. It regained its efficiency after cooling down. It has since slipped on one occasion due to the heat. Under ordinary touring conditions there is no sign of slipping without the foot is kept off the pedal. Under these conditions the pressure being light, it is very easy to cause a slip. Another feature which we have notice is, the pedal comes very near the floor boards with the flexible mounting of the engine and would in time cause the clutch to slip. The clutch trunion ball race is noisy; oiling does not cure it. The clutch at times has been very slow in stopping and at all times does not stop readily. The clutch case in the Magnesium does not show any defects. | ||