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 condition of a 20 HP chassis after a 10,000-mile test.
| Identifier | WestWitteringFiles\K\November1923\ Scan14 | |
| Date | 7th November 1923 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. 4594 REF: Hsl/LG7.11.23. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. WOR.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} (79-AO) 10,000 MILES TEST ON 20 HP. CHASSIS. The condition of this chassis when stripped on completion of the test was as follows :- It was arranged that when the car was stripped it had completed 800 miles since the last period of lubrication. We recommend in our Instruction Book the car should be lubricated every 500 miles - it is probable however that this mileage would be frequently exceeded so we took 800 miles to give us extreme conditions. ENGINE+ Big End Bearings. Three of the connecting rods are in a poor condition, the whitemetal in both top and bottom half bearings is cracked. The main Journal bearings are good, except that two of the intermediate bearings are scored, apparently due to dirt. Crankshaft. Noticeable wear has taken place on the Crankshaft - the measurement of which is attached. Cylinders. These are in good condition - the measurement of the bores is attached. Pistons. Several piston rings had stuck in the grooves due to carbon - the second ring being stuck on four of the pistons. No.5 piston was scored on the thrust side. Camshaft Bearings. There was a hard place in each bearing which had evidently been caused by drift used for driving the bearings in position. Brake blocks on Dynamo Pinion Drive. The fibre was charred and the drum grooved badly. Flywheel. The teeth on the flywheel were chipped but this was not nearly so bad as we have previously had after a similar distance when using the standard Bendix. contd:- | ||