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).
Testing procedures for cylinder bore wear, oil consumption, and piston ring performance.
| Identifier | ExFiles\Box 124\2\ scan0205 | |
| Date | 5th July 1940 | |
| -7- Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}4/JMS.5.7.40. off. The engine is to be run by the three remaining cylinders while carrying out any variations or observations on the three remaining bores, in which are fitted skeleton pistons to enable the con-rod assembly to go through its normal evolution. It was our intention as a first test on this rig, to compare SAE.20 and SAE.50 at Zero Centigrade, on a dry bore - run at 750 RPM (cold start, fast idle) to find out: a) The difference in time for the oil to reach the top of the bores. b) When it had done so, how much was left, say 24 hours later, under varying conditions of parking. The head to be removed as required, to observe the behaviour of the three remaining cylinders comparatively, under the same varying conditions. Taking the subject of cylinder bore wear generally, it was our intention to tabulate as much as possible of the following information from our files: 1) Specifications, of Pistons - Rings, and Cylinders, to cover the various ranges and past series of R.R. and Bentley engines. 2) Oil consumption and Blow-By.{R.W. Bailey - Chief Engineer} (a) To show rate of "bedding in" of rings against series by one hour oil consumptions test on the bed. (b) To show ditto on 10,000 miles chassis of corresponding unit specifications (daily reports). (c) Analysis of oil consumption at varying speeds; full throttle and part throttle with "blow-by" of the various series in (a) and (b). (d) Comparison of pinned and non-pinned rings for consumption and blow-by; this to include recent and past tests. (e) Comparison of varying pressures of rings, plus the effect of increased oil thrown up the bores. (f) Comparison of "L" section and plain compression rings. (g) Effect of discarding the scraper ring and putting an "L" section in its place. (h) Various types of "L" section ring, i.e. varying degrees of "L" sectioning of the ring (Curves could be plotted to show the angle of tilt against radial pressure, and how long it takes for the effect of tilt to wear off, i.e. for full face of ring to be bedding). Continued. | ||