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 of the camshaft, gearbox, clutch, and steering systems.
| Identifier | ExFiles\Box 21\1\ Scan017 | |
| Date | 23th October 1925 | |
| R.R. 493A (50 H) (D.D. 31. 12-6-25) J.H.L. EXPERIMENTAL REPORT. -2- Expl. No. REF:Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG231025 Camshaft is held in three bearings and supplied with forced lubrication. The whole IXH head of the cyl.block round the valve springs is swimming in oil and yet the exhaust shews no signs of over-oiling when light running. We were unable to elicit information as to oil penetrat-ing preventative device employed on valve stems. High speeds - exhaust boom drowns most of the valve gear noise. The latter does not seem excessive however. Dynamo and magneto are skew driven off the camshaft drive giving a very accessible make and break and easily inspected brush holders. On the whole remarkably quiet as regards mechanical noise for a overhead camshaft unit. The carburation is by two Zenith triple diffuser carburetters. GEARBOX. Central control - gear lever very conveniently placed for driver - 4-speed gear change rapid and easy, (clutch stop apparently fitted). Indirect gears reasonably good - they do not sound like ground gears. CLUTCH. Too much pressure required to disengage. Shudders badly on the take up. Stops readily. Not a good clutch. STEERING. Apparently irreversible as there is no self-centering. Not finger-light (suspect friction in pivots), but not heavy. Steering column did not seem very rigid contd :- (Watermark: AT CROXLEY) | ||