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).
Modifications and performance of a camshaft, petrol filter, and flywheel/clutch assembly.
| Identifier | ExFiles\Box 5a\3\ 03-page173 | |
| Date | 14th December 1931 guessed | |
| -7- This was taken out as it was causing crankcase pressure. The result was a quantity of oil was drawn into the air intake of the carburetter and drained out of the overflow pipe. There were slight signs of the carburetter building up after slow running, otherwise carburation has given satisfaction. CAMSHAFT to LOP.E.54371. E.57177 Camshaft .050 Increased Valve Lift 110.5° between Cams. We have not noticed any camshaft squawk or other troubles with the increased lift camshaft. RHOTS PETROL FILTER. The filter examined at 9,500 miles had a quantity of fluff adhering to the filter discs and there was a small quantity of sand in the bottom of the container, proving that the filter had been satisfactory in its operation. We have not had any shortage of supply during the runs. FLYWHEEL & CLUTCH to LOP.E.54793 E.S.3209 G.L.439-501 LoC.2959. (1) The following details fitted incorporating LoC.2959 - Thin Web Flywheel. G.54938 Flywheel G.54939 Back Plate. G.54940 Oil Catcher. G.54941 Ball Bearing Housing. Stronger Clutch Springs G.54136 fitted in place of G.54132. (2) H.A.D.11. Ferodo Clutch Lining-Scarf Joint-Chemically Bonded. (3) 8 Oil drain holes in place of 4 in Flywheel. (4) Oil Catcher Disc to cure Oil leaks on to the Ferodo. The clutch has been very smooth in engagement throughout the mileage. It was rather on the heavy side to disengage owing to the stronger clutch springs having been fitted. It started to slip during the first 5,000 miles and was dismantled to find the cause. We found that the automatic lubrication to the clutch spigot had been too liberal and that the oil catcher had not prevented the oil being thrown on to the clutch fabrics. We therefore plugged up the feed of the automatic lubrication. There was no sign, after doing this, of the clutch slipping. To lessen the heaviness of the clutch pedals we fitted standard clutch springs G.54132, and although the clutch did not actually slip, we found that it was on the verge the whole time, just resting the foot on the clutch pedal would start the engine racing. We had a lot of trouble in the first place with the oil pumping out of the front ball race into the clutch spigot feed, and it was thought that a baffle plate Ex.7122 which was fitted had entirely | ||