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).
Progress report on the testing and development of various engine and chassis components, including camshafts, pistons, and brakes.
| Identifier | ExFiles\Box 4\1\ 01-page318 | |
| Date | 11th June 1935 | |
| -2- HA/No.17/MR.11.6.35. We also have a shorter duration camshaft with reduced toe on test to improve the slow running with the existing 4 carburetters. We want to purchase a Cambridge Exhaust Gas Analyser, which costs about £50, to help us with distribution work. We have had one on test and find it very satisfactory. In addition to the roller tappets which are being produced, we are having a set of the original followers which gave trouble hard chromium plated by the Rover Company. They have reason to believe that this will reduce the picking up. Piston Knocks & Overoiling. We shall not get delivery of the steel skirt pistons mentioned at the last Conference for about 3 weeks. We are making some connecting rods so that we can run SpectreCodename for Phantom III pistons in the Bentley and so get a value for the SpectreCodename for Phantom III pistons in an engine the other characteristics of which are known. We have arranged with the Aerolite people to form grind existing sets of our semi-split pistons with a view to proving the bedding. The crankcup baffles fitted so far indicate that they will reduce the overoiling trouble. Crankshaft period. The larger crankshaft damper is now ready for test. We have demonstrated that by raising the clutch pedal from the clutch levers by means of a spring the period becomes undetectable in the inside of the car unless the foot is kept on the pedal. Valve Bounce. The double valve springs with increased load are O.K. up to 4,800 r.p.m. Brakes. The detailing of the Phantom adjustment is going ahead. The brakes on SpectreCodename for Phantom III 2 were bad & a type of adjustment as loaded up indicated that when we get the new adjustment we shall have a system which is at least as good as that at present fitted to the Phantom. | ||