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).
Analysis of cylinder bore wear comparing Aerolite and Split Skirt pistons in Bentley engines.
| Identifier | ExFiles\Box 132\4\ scan0107 | |
| Date | 19th October 1937 | |
| -15- Hs{Lord Ernest Hives - Chair}/Mths.{Reg Matthews}8/WB.{Mr Brazier/Mr Bell}19.10.37. why the Oldsmobile requires two scraper rings to get the same oil consumption as the Chevrolet, it will be seen that the flutter speed of the Oldsmobile scraper ring is much lower than that of the Chevrolet and is within the running range of the engine. Cylinder Wear. Analysing the reports from the various depots it is noticeable that bore wear has increased considerably since the adoption of Aerolite Pistons, and Fig. XIII is interesting in this respect, as it shows that the initial wear with Aerolite Pistons is considerably greater with the R.R. split skirt type of Piston. These figures have been taken from approx. 500 cars, but the number of cars with Aerolite pistons having a mileage above 20,000 is rather low so that the figures given at about this mileage and above, are not as reliable as those for the RR. type of piston at the same mileage. At the lower mileages the figures for both types are quite reliable. Graph Text: FIG. XIII BENTLEY CYLINDER BORE WEAR Y-Axis: CYL. WEAR PER 1000 MILES. (INCHES / 10,000) X-Axis: MILEAGE. (MILES X 1000) Legend: ① AEROLITE PISTONS ② SPLIT SKIRT (EB. 1299) Handwritten Note: MTHS.{Reg Matthews} 11.1.37 | ||